F. Zahry - Academia.edu (original) (raw)
Papers by F. Zahry
This work is a study of elemental composition of particulate matter (PM-10, with aerodynamic diam... more This work is a study of elemental composition of particulate matter (PM-10, with aerodynamic diameter lower or equalizes to 10 µm, collected in Meknes city in Morocco. The compaigns of measure carried out on a traffic site from March 2007 to April 2008. The chemical concentration of 9 elements (Ca, Cr, Cu, Fe, K, Mn, Ni, Pb and Zn) were determined by Total reflection X-Ray Fluorescence (TXRF), Al was determined by Atomic Absorption Spectrometry (AAS), whereas, the Pb isotopic compositions were determined by Thermo Ionisation Mass Spectrometry (TIMS). the obtained results show quite significant seasonal variation of the chemical composition of fine and coarse fractions. It should be noted that Pb and Ni concentrations exceeded the air quality standars. the calculation of the Enrichment Factor (EF) revealed that Cr and Pb were attributer mainly to anthropogenic sources. The use of the isotopic extraction of lead confirms the anthropic origin of Pb.
This work is a study of elemental composition of particulate matter (PM-10, with aerodynamic diam... more This work is a study of elemental composition of particulate matter (PM-10, with aerodynamic diameter lower or equalizes to 10 µm, collected in Meknes city in Morocco. The campaigns of measure carried out on a traffic site from March 2007 to April 2008. The chemical concentrations of 9 elements (Ca, Cr, Cu, Fe, K, Mn, Ni, Pb and Zn) were determined by Total reflection X-Ray Fluorescence (TXRF), Al was determined by the Atomic Absorption Spectrometry (AAS), whereas the Pb isotopic compositions were determined by Thermo Ionisation Mass Spectrometry (TIMS). The obtained results show quite significant seasonal variation of the chemical composition for fine and coarse fractions. It should be noted that Pb and Ni concentrations exceeded the air quality standards. The calculation of the Enrichment Factor (EE) revealed that Cr and Pb were attributed mainly to anthropogenic sources. The use of the isotopic extraction of lead confirms the anthropic origin of Pb.
In this work, we are interested on evaluation of Atomic Absorption Spectrometer, AAS (Thermo Fisc... more In this work, we are interested on evaluation of Atomic Absorption Spectrometer, AAS (Thermo Fischer Scientific iCE 3500). Cr, Pb, Fe, Zn, Mn and Cu are used in order to apply some kind of validation test: calibration function, limits of detection and quantification, repeatability and reproducibility as well as the accuracy of measurements. This was carried out by the two atomization systems of AAS (flame and furnace graphite), by considering the field of desired concentrations and by basing on standards and/or materials of certified references.
International Journal of Biological and Chemical Sciences, 2013
X-Ray Spectrometry, 2013
ABSTRACT Samples of fine and coarse fraction of airborne particulate matter were collected on wee... more ABSTRACT Samples of fine and coarse fraction of airborne particulate matter were collected on weekly basis during the period from February 2007 to February 2008 in Kenitra City, Morocco. The samples were collected using a Gent stacked filter sampler in two fractions (<2.5 micro-mètre, fine and 2.5–10 micro-mètre, coarse). The samples were analyzed for their elemental composition by total reflection X-ray fluorescence. The data set was then analyzed by the factor analysis method, positive matrix factorization to identify the possible sources of particulate matter and their contribution to the ambient particulate matter concentrations in Kenitra City. Four factors from positive matrix factorization solutions were found for elemental composition of fine and coarse particulate matter at the Kenitra site. In the case of fine particles, metal smelting sources contribute about 52% of the fine mass. The road dust contributes to about 22% and the rest 26% comprises emissions from motor vehicles and soil dust. In the case of coarse particles, soil dust contributes about 43% and the two stroke engines about 42% of the coarse mass, whereas road dust and motor vehicles apportioned to be about 10 and 4%, respectively.
Journal of Radioanalytical and Nuclear Chemistry, 2007
ABSTRACT Elemental analyses of 10 geological samples from Morocco and some Standard Reference Mat... more ABSTRACT Elemental analyses of 10 geological samples from Morocco and some Standard Reference Materials were performed by Energy Dispersion X-Rays Fluorescence, Wavelength Dispersion X-Rays Fluorescence and Neutron Activation Analysis techniques in order to assess the accuracy and sensitivity of the concentrations determined with regard to requirements in geochemical exploration. The possibilities of utilization of EDXRF as an appropriate and economic technique for the analysis of various elements which are important in interpretation of geochemical data were evaluated.
Journal de Physique IV (Proceedings), 2004
Dans ce travail, nous présentons une étude comparative des techniques d'analyse par fluorescence ... more Dans ce travail, nous présentons une étude comparative des techniques d'analyse par fluorescence X à dispersion d'énergie (ED-XRF) et à dispersion de longueur d'onde (WD-XRF), et par spectrométrie d'émission atomique à source plasma couplée par induction (ICP-AES). Les résultats de la calibration des spectromètres à dispersion d'énergie, à excitation par sources radioactives (55 Fe, 109 Cd et 241 Am) et à excitation secondaire (cible secondaire Mo et Cu) du Centre National pour l'Energie, les Sciences et les Techniques Nucléaires (CNESTEN, Rabat, Maroc) sur des échantillons étalons de références de l'Agence International de l'Energie Atomique (AIEA) et du Community Bureau of Référence (BCR) ont été comparés aux résultats d'analyse des mêmes échantillons étalons par la spectrométrie X à dispersion de longueur d'onde (WD-XRF) et par spectrométrie d'émission atomique à source plasma couplé par induction (ICP-AES) au département GENERIC du centre SPIN à l'Ecole des Mines de Saint-Etienne (France). Les trois techniques d'analyse utilisées donnent des résultats comparables pour le dosage des éléments majeurs, alors que pour les traces on note des déviations importantes à cause des effets de matrice qui sont difficiles à corriger dans le cas de la fluorescence X.
Journal de Physique IV (Proceedings), 2003
The analysis of water, suspended particulate matter (SPM) and sediment collected from Oum er Rbia... more The analysis of water, suspended particulate matter (SPM) and sediment collected from Oum er Rbia Moroccan basin for the content of six elements has been performed utilizing ICP-AES and WD-XRF methods. Sediment have been analyzed by WD-XRF ; Water and MPS by ICP-AES. The detection limits are sufficient for most of the elements to be determined. Results were assessed for the accuracy by the analysis of a multi-elemental standards. The results for most of the elements obtained were accurate to about 2-15%. The objective of the analysis were to determine the geochemical areas on this bassin, to explain the mechanisms of sediment transport and nevertheless, to assess the pollution of the bassin by heavy metals generated by human activities. This work interests only the last aspect. It has done one 30 samples of water and SPM, and about 80 sediments. Samples were collected along the river, between its source in meddle Atlas and the Atlantic ocean at Azemour city. The results obtained on the basin were normalized to the international norms.
Journal de Physique IV (Proceedings), 2003
Oued Boufekrane is a river that takes its source about thirty kilometers southern the city of Mek... more Oued Boufekrane is a river that takes its source about thirty kilometers southern the city of Meknes central Morocco) The water of this river is used for the irrigation of agricultural soils and it also covers the needs of water for part of rural population. When passing through Meknes city, it is loaded by waste waters of urban and industrial
The study of air pollution is the subject of considerable research over the last years. In fact, ... more The study of air pollution is the subject of considerable research over the last years. In fact, the air quality can alter climate, biogeochemical cycles and chemistry of atmosphere and adversely affect public health. In Morocco also, a great interest are given to this phenomenon in the last years. The aim of the present study is to establish a monitoring system in the city of Kenitra, to evaluate the health expositions of the populations to the effects of air pollution in this city. To reach these objectives, we have adopted two methodologies: The first consists in determining the gas concentrations using the ultraviolet absorption; and the second in collecting selective aerosols on filters. To evaluate the rate of pollution, we have used a Dichotomous sampler to collect the aerosols, and the Atomic Absorption Spectroscopy (AAS) to analyze the collected filters. The obtained results showed that the contents of sulfur dioxide (SO2), suspended matter (SPM) and heavy metals (Pb, Cd and Ni) recorded in the studied areas, exceed the Moroccan norms and the recommended values by OMS and EU.
Meknes, city in northern of central Morocco at the medium Atlas with a seasonal climate, has 171 ... more Meknes, city in northern of central Morocco at the medium Atlas with a seasonal climate, has 171 industrial units. The main of these industries are food processing, textile manufacturing, chemical and para-chemical industry, and metallic and mechanical industry. The aim of this study is the evaluation of air quality in Meknes city. It consists in quantification of atmospheric pollution by sulphur dioxide (SO 2 ) coarse and fine particulate matters respectively PM-10 and PM-2.5, and heavy metals contents. The sampling was carried out between March 2007 and April 2008 in urban station with important road traffic using Gent and Dichotomous samplers. The chemical composition of collected filters was evaluated by using two analytical techniques: Total X-Ray Fluorescence (TXRF) and Atomic Absorption Spectroscopy (AAS). The results show highest concentrations of particulate matter in summer and lowest ones in winter, particularly for coarse fractions. This indicates the important contribution of soil dusts and the re-suspension of deposited particles. Data treatment carried out by application of mathematical, physical and statistical methods showed that: The seasonal variation is observed for SO2 concentrations and coarse fractions of particulate matter especially in winter and summer. These variations could be attributed to traffic intensity and meteorology influence (wind, rain…). Physical characterization of heavy metal contents by application of receptor model Positive Matrix Factorization (PMF) reveal the existence of four major emission sources: traffic, soil dusts and re-suspension of deposited particles, cement industry and railroad traffic.
Physical and Chemical News
The variations of heavy metal contents have been analyzed at samples of Mytilus edulis collected ... more The variations of heavy metal contents have been analyzed at samples of Mytilus edulis collected from different points of the mouth of Sebou during the spring and the summer of the year 2005, the concentrations of Cu, Mn, Fe, Co, Cr, Pb and Cd have been determined by SAA.
Physical and Chemical News
The study of air pollution is the subject of considerable research over the last years. In fact, ... more The study of air pollution is the subject of considerable research over the last years. In fact, the air quality can alter climate, biogeochemical cycles and chemistry of atmosphere and adversely affect public health. In Morocco also, a great interest are given to this phenomenon in the last years. The aim of the present study is to establish a monitoring system in the city of Kenitra, to evaluate the health expositions of the populations to the effects of air pollution in this city. To reach these objectives, we have adopted two methodologies: The first consists in determining the gas concentrations using the ultraviolet absorption; and the second in collecting selective aerosols on filters. To evaluate the rate of pollution, we have used a Dichotomous sampler to collect the aerosols, and the Atomic Absorption Spectroscopy (AAS) to analyze the collected filters. The obtained results showed that the contents of sulfur dioxide (SO2), suspended matter (SPM) and heavy metals (Pb, Cd an...
In this work, we are interested on evaluation of Atomic Absorption Spectrometer, AAS (Thermo Fisc... more In this work, we are interested on evaluation of Atomic Absorption Spectrometer, AAS (Thermo Fischer Scientific iCE 3500). Cr, Pb, Fe, Zn, Mn and Cu are used in order to apply some kind of validation test: calibration function, limits of detection and quantification, repeatability and reproducibility as well as the accuracy of measurements. This was carried out by the two atomization systems of AAS (flame and furnace graphite), by considering the field of desired concentrations and by basing on standards and/or materials of certified references.
This work is a study of the particulate and elementary matter in the town of Meknes in Morocco. T... more This work is a study of the particulate and elementary matter in the town of Meknes in Morocco. The aerosol samples were collected with Gent PM-10 stacked filter unit (SFU). The aerosol particles were separated by the SFU into a coarse and a fine sized fractions. The pollutants were collected between March 2007 and April 2008. The chemical concentrations of thirteen elements (Ca, Cl, Cr, Cu, Fe, K, Mn, Ni, Pb, S, Sr, Ti and Zn) weredetermined by X-ay Fluorescence with Total Reflexion (XFTR), whereas Al was is determined by the Atomic Absorption Spectrometry. In the case of the matter particulate, the fine/PM-10 ratios are in general rather weak (lower than 0.5), showing the importance of the terrigenous contributions and the handing-over in suspension of the ground, especially in July and August when the coarse fraction reaches the highest contents (increase in the wind erosion of the ground). The concentrations measured were found to be higher than European quality standards and re...
In this work, we were interested in a preliminary evaluation of air quality in the town of Meknes... more In this work, we were interested in a preliminary evaluation of air quality in the town of Meknes, in particular, the measurement of sulphur dioxide (SO2), ozone (O3) and the particulate matter in suspension (PM-10) whose particles have a diameter lower than 10 μm, with separation of the fractions according to the size: fine fractions (diameter lower or equalizes with 2.5 μg/m3) and coarse fractions (diameter between 2.5 μg/m3 and 10 μg/m3). The samples were collected one day in (July, October and November 2005) in several sites (urban, suburban, proximity,…). The mesures of the gaseous pollutants (SO2 and O3) were realized on the site every 15 min. by automatic analyzers (AF21M and O341M). Whereas, PM-10 were collected respectively by Dichotomous and the Gent samplers. The chemical and mineral composition of the PM-10 was determined by various techniques of physicochemical analyses: Atomic Absorption Spectrometer (SAA), X-ray Fluorescence in Total Reflection (TXRF), Scanning Electr...
An assessment of air quality of Kenitra's city (Morocco) was performed by determining the mas... more An assessment of air quality of Kenitra's city (Morocco) was performed by determining the mass concentrations of PM 2.5 and PM 2.5-10 particulate matter (PM) in a sampling campaign from July 2007 to mid-Mai 2008. The samples were collected in an intense traffic area with a Gent stacked filter unit sampler in two fractions: fine (< 2.5 µm equivalent aerodynamic diameter (EAD)) and coarse (2.5-10 µm EAD) size fraction. The elemental composition, determined by Atomic Absorption Spectrometry (AAS) technique, was wholly different in the two fractions. Twelve element concentrations (Cd, Cr, Cu, Mn, Ni, Pb, Zn, Fe, Ca, Na, K and Al) were quantified after sampling on Nuclepore polycarbonate filters. The principal component analysis (PCA) of elements and mass concentration data allowed a quantification of three main sources contributing to PM 2.5-10 and PM 2.5 composition: re-suspended crustal dust, vehicles exhaust and industrial emissions. Regarding the influence of meteorological c...
This work is a study of elemental composition of particulate matter (PM-10, with aerodynamic diam... more This work is a study of elemental composition of particulate matter (PM-10, with aerodynamic diameter lower or equalizes to 10 µm, collected in Meknes city in Morocco. The compaigns of measure carried out on a traffic site from March 2007 to April 2008. The chemical concentration of 9 elements (Ca, Cr, Cu, Fe, K, Mn, Ni, Pb and Zn) were determined by Total reflection X-Ray Fluorescence (TXRF), Al was determined by Atomic Absorption Spectrometry (AAS), whereas, the Pb isotopic compositions were determined by Thermo Ionisation Mass Spectrometry (TIMS). the obtained results show quite significant seasonal variation of the chemical composition of fine and coarse fractions. It should be noted that Pb and Ni concentrations exceeded the air quality standars. the calculation of the Enrichment Factor (EF) revealed that Cr and Pb were attributer mainly to anthropogenic sources. The use of the isotopic extraction of lead confirms the anthropic origin of Pb.
This work is a study of elemental composition of particulate matter (PM-10, with aerodynamic diam... more This work is a study of elemental composition of particulate matter (PM-10, with aerodynamic diameter lower or equalizes to 10 µm, collected in Meknes city in Morocco. The campaigns of measure carried out on a traffic site from March 2007 to April 2008. The chemical concentrations of 9 elements (Ca, Cr, Cu, Fe, K, Mn, Ni, Pb and Zn) were determined by Total reflection X-Ray Fluorescence (TXRF), Al was determined by the Atomic Absorption Spectrometry (AAS), whereas the Pb isotopic compositions were determined by Thermo Ionisation Mass Spectrometry (TIMS). The obtained results show quite significant seasonal variation of the chemical composition for fine and coarse fractions. It should be noted that Pb and Ni concentrations exceeded the air quality standards. The calculation of the Enrichment Factor (EE) revealed that Cr and Pb were attributed mainly to anthropogenic sources. The use of the isotopic extraction of lead confirms the anthropic origin of Pb.
In this work, we are interested on evaluation of Atomic Absorption Spectrometer, AAS (Thermo Fisc... more In this work, we are interested on evaluation of Atomic Absorption Spectrometer, AAS (Thermo Fischer Scientific iCE 3500). Cr, Pb, Fe, Zn, Mn and Cu are used in order to apply some kind of validation test: calibration function, limits of detection and quantification, repeatability and reproducibility as well as the accuracy of measurements. This was carried out by the two atomization systems of AAS (flame and furnace graphite), by considering the field of desired concentrations and by basing on standards and/or materials of certified references.
International Journal of Biological and Chemical Sciences, 2013
X-Ray Spectrometry, 2013
ABSTRACT Samples of fine and coarse fraction of airborne particulate matter were collected on wee... more ABSTRACT Samples of fine and coarse fraction of airborne particulate matter were collected on weekly basis during the period from February 2007 to February 2008 in Kenitra City, Morocco. The samples were collected using a Gent stacked filter sampler in two fractions (<2.5 micro-mètre, fine and 2.5–10 micro-mètre, coarse). The samples were analyzed for their elemental composition by total reflection X-ray fluorescence. The data set was then analyzed by the factor analysis method, positive matrix factorization to identify the possible sources of particulate matter and their contribution to the ambient particulate matter concentrations in Kenitra City. Four factors from positive matrix factorization solutions were found for elemental composition of fine and coarse particulate matter at the Kenitra site. In the case of fine particles, metal smelting sources contribute about 52% of the fine mass. The road dust contributes to about 22% and the rest 26% comprises emissions from motor vehicles and soil dust. In the case of coarse particles, soil dust contributes about 43% and the two stroke engines about 42% of the coarse mass, whereas road dust and motor vehicles apportioned to be about 10 and 4%, respectively.
Journal of Radioanalytical and Nuclear Chemistry, 2007
ABSTRACT Elemental analyses of 10 geological samples from Morocco and some Standard Reference Mat... more ABSTRACT Elemental analyses of 10 geological samples from Morocco and some Standard Reference Materials were performed by Energy Dispersion X-Rays Fluorescence, Wavelength Dispersion X-Rays Fluorescence and Neutron Activation Analysis techniques in order to assess the accuracy and sensitivity of the concentrations determined with regard to requirements in geochemical exploration. The possibilities of utilization of EDXRF as an appropriate and economic technique for the analysis of various elements which are important in interpretation of geochemical data were evaluated.
Journal de Physique IV (Proceedings), 2004
Dans ce travail, nous présentons une étude comparative des techniques d'analyse par fluorescence ... more Dans ce travail, nous présentons une étude comparative des techniques d'analyse par fluorescence X à dispersion d'énergie (ED-XRF) et à dispersion de longueur d'onde (WD-XRF), et par spectrométrie d'émission atomique à source plasma couplée par induction (ICP-AES). Les résultats de la calibration des spectromètres à dispersion d'énergie, à excitation par sources radioactives (55 Fe, 109 Cd et 241 Am) et à excitation secondaire (cible secondaire Mo et Cu) du Centre National pour l'Energie, les Sciences et les Techniques Nucléaires (CNESTEN, Rabat, Maroc) sur des échantillons étalons de références de l'Agence International de l'Energie Atomique (AIEA) et du Community Bureau of Référence (BCR) ont été comparés aux résultats d'analyse des mêmes échantillons étalons par la spectrométrie X à dispersion de longueur d'onde (WD-XRF) et par spectrométrie d'émission atomique à source plasma couplé par induction (ICP-AES) au département GENERIC du centre SPIN à l'Ecole des Mines de Saint-Etienne (France). Les trois techniques d'analyse utilisées donnent des résultats comparables pour le dosage des éléments majeurs, alors que pour les traces on note des déviations importantes à cause des effets de matrice qui sont difficiles à corriger dans le cas de la fluorescence X.
Journal de Physique IV (Proceedings), 2003
The analysis of water, suspended particulate matter (SPM) and sediment collected from Oum er Rbia... more The analysis of water, suspended particulate matter (SPM) and sediment collected from Oum er Rbia Moroccan basin for the content of six elements has been performed utilizing ICP-AES and WD-XRF methods. Sediment have been analyzed by WD-XRF ; Water and MPS by ICP-AES. The detection limits are sufficient for most of the elements to be determined. Results were assessed for the accuracy by the analysis of a multi-elemental standards. The results for most of the elements obtained were accurate to about 2-15%. The objective of the analysis were to determine the geochemical areas on this bassin, to explain the mechanisms of sediment transport and nevertheless, to assess the pollution of the bassin by heavy metals generated by human activities. This work interests only the last aspect. It has done one 30 samples of water and SPM, and about 80 sediments. Samples were collected along the river, between its source in meddle Atlas and the Atlantic ocean at Azemour city. The results obtained on the basin were normalized to the international norms.
Journal de Physique IV (Proceedings), 2003
Oued Boufekrane is a river that takes its source about thirty kilometers southern the city of Mek... more Oued Boufekrane is a river that takes its source about thirty kilometers southern the city of Meknes central Morocco) The water of this river is used for the irrigation of agricultural soils and it also covers the needs of water for part of rural population. When passing through Meknes city, it is loaded by waste waters of urban and industrial
The study of air pollution is the subject of considerable research over the last years. In fact, ... more The study of air pollution is the subject of considerable research over the last years. In fact, the air quality can alter climate, biogeochemical cycles and chemistry of atmosphere and adversely affect public health. In Morocco also, a great interest are given to this phenomenon in the last years. The aim of the present study is to establish a monitoring system in the city of Kenitra, to evaluate the health expositions of the populations to the effects of air pollution in this city. To reach these objectives, we have adopted two methodologies: The first consists in determining the gas concentrations using the ultraviolet absorption; and the second in collecting selective aerosols on filters. To evaluate the rate of pollution, we have used a Dichotomous sampler to collect the aerosols, and the Atomic Absorption Spectroscopy (AAS) to analyze the collected filters. The obtained results showed that the contents of sulfur dioxide (SO2), suspended matter (SPM) and heavy metals (Pb, Cd and Ni) recorded in the studied areas, exceed the Moroccan norms and the recommended values by OMS and EU.
Meknes, city in northern of central Morocco at the medium Atlas with a seasonal climate, has 171 ... more Meknes, city in northern of central Morocco at the medium Atlas with a seasonal climate, has 171 industrial units. The main of these industries are food processing, textile manufacturing, chemical and para-chemical industry, and metallic and mechanical industry. The aim of this study is the evaluation of air quality in Meknes city. It consists in quantification of atmospheric pollution by sulphur dioxide (SO 2 ) coarse and fine particulate matters respectively PM-10 and PM-2.5, and heavy metals contents. The sampling was carried out between March 2007 and April 2008 in urban station with important road traffic using Gent and Dichotomous samplers. The chemical composition of collected filters was evaluated by using two analytical techniques: Total X-Ray Fluorescence (TXRF) and Atomic Absorption Spectroscopy (AAS). The results show highest concentrations of particulate matter in summer and lowest ones in winter, particularly for coarse fractions. This indicates the important contribution of soil dusts and the re-suspension of deposited particles. Data treatment carried out by application of mathematical, physical and statistical methods showed that: The seasonal variation is observed for SO2 concentrations and coarse fractions of particulate matter especially in winter and summer. These variations could be attributed to traffic intensity and meteorology influence (wind, rain…). Physical characterization of heavy metal contents by application of receptor model Positive Matrix Factorization (PMF) reveal the existence of four major emission sources: traffic, soil dusts and re-suspension of deposited particles, cement industry and railroad traffic.
Physical and Chemical News
The variations of heavy metal contents have been analyzed at samples of Mytilus edulis collected ... more The variations of heavy metal contents have been analyzed at samples of Mytilus edulis collected from different points of the mouth of Sebou during the spring and the summer of the year 2005, the concentrations of Cu, Mn, Fe, Co, Cr, Pb and Cd have been determined by SAA.
Physical and Chemical News
The study of air pollution is the subject of considerable research over the last years. In fact, ... more The study of air pollution is the subject of considerable research over the last years. In fact, the air quality can alter climate, biogeochemical cycles and chemistry of atmosphere and adversely affect public health. In Morocco also, a great interest are given to this phenomenon in the last years. The aim of the present study is to establish a monitoring system in the city of Kenitra, to evaluate the health expositions of the populations to the effects of air pollution in this city. To reach these objectives, we have adopted two methodologies: The first consists in determining the gas concentrations using the ultraviolet absorption; and the second in collecting selective aerosols on filters. To evaluate the rate of pollution, we have used a Dichotomous sampler to collect the aerosols, and the Atomic Absorption Spectroscopy (AAS) to analyze the collected filters. The obtained results showed that the contents of sulfur dioxide (SO2), suspended matter (SPM) and heavy metals (Pb, Cd an...
In this work, we are interested on evaluation of Atomic Absorption Spectrometer, AAS (Thermo Fisc... more In this work, we are interested on evaluation of Atomic Absorption Spectrometer, AAS (Thermo Fischer Scientific iCE 3500). Cr, Pb, Fe, Zn, Mn and Cu are used in order to apply some kind of validation test: calibration function, limits of detection and quantification, repeatability and reproducibility as well as the accuracy of measurements. This was carried out by the two atomization systems of AAS (flame and furnace graphite), by considering the field of desired concentrations and by basing on standards and/or materials of certified references.
This work is a study of the particulate and elementary matter in the town of Meknes in Morocco. T... more This work is a study of the particulate and elementary matter in the town of Meknes in Morocco. The aerosol samples were collected with Gent PM-10 stacked filter unit (SFU). The aerosol particles were separated by the SFU into a coarse and a fine sized fractions. The pollutants were collected between March 2007 and April 2008. The chemical concentrations of thirteen elements (Ca, Cl, Cr, Cu, Fe, K, Mn, Ni, Pb, S, Sr, Ti and Zn) weredetermined by X-ay Fluorescence with Total Reflexion (XFTR), whereas Al was is determined by the Atomic Absorption Spectrometry. In the case of the matter particulate, the fine/PM-10 ratios are in general rather weak (lower than 0.5), showing the importance of the terrigenous contributions and the handing-over in suspension of the ground, especially in July and August when the coarse fraction reaches the highest contents (increase in the wind erosion of the ground). The concentrations measured were found to be higher than European quality standards and re...
In this work, we were interested in a preliminary evaluation of air quality in the town of Meknes... more In this work, we were interested in a preliminary evaluation of air quality in the town of Meknes, in particular, the measurement of sulphur dioxide (SO2), ozone (O3) and the particulate matter in suspension (PM-10) whose particles have a diameter lower than 10 μm, with separation of the fractions according to the size: fine fractions (diameter lower or equalizes with 2.5 μg/m3) and coarse fractions (diameter between 2.5 μg/m3 and 10 μg/m3). The samples were collected one day in (July, October and November 2005) in several sites (urban, suburban, proximity,…). The mesures of the gaseous pollutants (SO2 and O3) were realized on the site every 15 min. by automatic analyzers (AF21M and O341M). Whereas, PM-10 were collected respectively by Dichotomous and the Gent samplers. The chemical and mineral composition of the PM-10 was determined by various techniques of physicochemical analyses: Atomic Absorption Spectrometer (SAA), X-ray Fluorescence in Total Reflection (TXRF), Scanning Electr...
An assessment of air quality of Kenitra's city (Morocco) was performed by determining the mas... more An assessment of air quality of Kenitra's city (Morocco) was performed by determining the mass concentrations of PM 2.5 and PM 2.5-10 particulate matter (PM) in a sampling campaign from July 2007 to mid-Mai 2008. The samples were collected in an intense traffic area with a Gent stacked filter unit sampler in two fractions: fine (< 2.5 µm equivalent aerodynamic diameter (EAD)) and coarse (2.5-10 µm EAD) size fraction. The elemental composition, determined by Atomic Absorption Spectrometry (AAS) technique, was wholly different in the two fractions. Twelve element concentrations (Cd, Cr, Cu, Mn, Ni, Pb, Zn, Fe, Ca, Na, K and Al) were quantified after sampling on Nuclepore polycarbonate filters. The principal component analysis (PCA) of elements and mass concentration data allowed a quantification of three main sources contributing to PM 2.5-10 and PM 2.5 composition: re-suspended crustal dust, vehicles exhaust and industrial emissions. Regarding the influence of meteorological c...