Miguel Murillo - Profile on Academia.edu (original) (raw)

Papers by Miguel Murillo

Research paper thumbnail of STUDY OF NANOSECOND ND: YAG 213 nm LASER ABLATION OF EXTRA HEAVY CRUDE OIL BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY

The Laser-Extra Heavy Crude Oil interaction was studied using a nanosecond Nd:YAG 213 nm laser co... more The Laser-Extra Heavy Crude Oil interaction was studied using a nanosecond Nd:YAG 213 nm laser coupled to an ICP-MS. For this study, ~2.7 g Extra Heavy Crude Oil was mixed with ~3 mL xylene and 0,3 g organic multielemental solution containing 100 µg g-1 of Ag, Al, Ba, Cd, Cr, Cu, Mg, Mn, Mo, Ni, Pb, Sn, Ti, V, and Zn, xylene was left to evaporate at 90 °C and multielemental samples were obtained and analyzed by LA-ICPMS. Laser parameters, such as, ablation gas flow, sample scanning speed, spot size, fluence and focus position were optimized and RSD (n = 8) from 3% to 5% for the net signal of 63 Cu, 95 Mo, 60 Ni and 66 Zn and from 0.9% to 3.3% for the ratios Ni/Mo and Cu/Zn were obtained. Elemental fractionation was observed with both Zn and Cd when fluence was varied. Nevertheless, evidence is not enough to explain results as a consequence of high volatility or high ionization potential (PI) of these elements. Ablation craters obtained show signs of more pronounced thermal processes...

Research paper thumbnail of Avances en Química

Speciation analysis of organomercurial compounds in Fish Tissue by capillary gas chromatography c... more Speciation analysis of organomercurial compounds in Fish Tissue by capillary gas chromatography coupled to microwave-induced plasma atomic emission detection Avances en Química, vol. 3, núm. 2, mayo-agosto, 2008, pp. 59-67 Universidad de los Andes

Research paper thumbnail of Hidrogeles De Acrilamida/Ácido Acrilico y De Acrilamida/Poli(Ácido Acrilico): Estudio De Su Capacidad De Remediación en Efluentes Industriales

Hidrogeles De Acrilamida/Ácido Acrilico y De Acrilamida/Poli(Ácido Acrilico): Estudio De Su Capacidad De Remediación en Efluentes Industriales

Revista Latinoamericana de Metalurgia y Materiales

Hydrogels were synthesized from ammonium persulphate (PSA), N, N'- methylenebisacrylamide (MB... more Hydrogels were synthesized from ammonium persulphate (PSA), N, N'- methylenebisacrylamide (MBAAm), acrylamide and poly(acrylic acid), (AAm / PAAc) varying the acrylamide feeding ratio. The incorporation of AAm and PAAc in the networks was demonstrated by the characterization of the obtained gels with Fourier Transformed Infrared Spectroscopy (FT-IR). Additionally, poly (acrylamide-co-acrylic acid) (AAm/AAc) hydrogels were synthesized and characterized to compare with the interpenetrated networks (IPNs). Absorption studies of pure water and metallic salts aqueous solutions were carried out, observing a larger hydration degree (swelling) when the concentration of PAAc was increased and the percentage of MBAAm decreased. The synthesized hydrogels in a 60/40 ratio, AAm / PAAc showed the best absorption properties, both in water as in metallic (Mg2 +, Cu2 +) solutions. The kinetic parameters showed that the acrylamide favors the absorption speed (k), while the presence of PAAc in the...

Research paper thumbnail of 500L equipo de destilación de cerveza cerveza equipo de fermentación acrílico): Estudio de su capacidad de remediación en efluentes industriales

500L equipo de destilación de cerveza cerveza equipo de fermentación acrílico): Estudio de su capacidad de remediación en efluentes industriales

Revista Latinoamericana de Metalurgia y Materiales, Jun 1, 2010

Research paper thumbnail of Coupled Plasma-Atomic Emission Spectrometry With Slurry Sample Introduction

Coupled Plasma-Atomic Emission Spectrometry With Slurry Sample Introduction

The very high temperatures reached in plasmas make these sources an efficient tool for evaporatin... more The very high temperatures reached in plasmas make these sources an efficient tool for evaporating and atomizing solid materials. However, drawbacks inherent to this technique such as differences in sample transport efficiency, analyte volatility and atomization, and matrix dependency are still problems to be solved. On the other hand, quantification has usually been carried out by comparison with known reference materials and so it appears that the use. of intemal standards would be essential for controlling sorne of the above variables.

Research paper thumbnail of Simultaneous Determination of Nickel, Iron, and Copper in Margarine by Inductively Coupled Plasma–Atomic Emission Spectroscopy after Sample Emulsification

Journal of AOAC INTERNATIONAL, 2002

Nickel, iron, and copper were determined in margarine samples by using emulsification followed by... more Nickel, iron, and copper were determined in margarine samples by using emulsification followed by inductively coupled plasma–atomic emission spectroscopy. Sample treatment and instrumental conditions were optimized, and the results were compared with those obtained by a pseudodigestion method in order to evaluate the compatibility of both methodologies. The optimum amount of margarine in the emulsion was 35% when the surfactant Tween 80 was added as the emulsifier. Copper was below the detection limits of both methodologies, i.e., digestion and emulsion; iron and nickel concentrations found by both methodologies were similar. The detection limits of the emulsion method were 0.002, 0.015, and 0.092 mg/kg for copper, iron, and nickel, respectively. A benefit of the emulsion method is that laborious and lengthy sample digestion procedures are avoided. In addition, accurate and precise results are obtained. Recoveries with the emulsion method ranged from 101 to 104%, with relative stand...

Research paper thumbnail of A Lab‐Built Hydride Generation Nebulizer for AAS

A Lab‐Built Hydride Generation Nebulizer for AAS

Instrumentation Science & Technology, 2007

A nebulizer for the hydride generation atomic‐absorption spectrophotometry of As and Se, and Hg v... more A nebulizer for the hydride generation atomic‐absorption spectrophotometry of As and Se, and Hg vapor generation is described, in which the gas flow, the reductant, and the sample are connected separately through three concentric channels. The sample and the reducing agent flow separately till they reach the air flow. The generated species are then mixed with the air carrier gas

Research paper thumbnail of Influence of additives on the carryover effects of Hg during ICP-OES analysis of immunoglobulines samples

Influence of additives on the carryover effects of Hg during ICP-OES analysis of immunoglobulines samples

Atomic S …, 2000

... on the Carryover Effects of Hg During ICP-OES Analysis of Immunoglobulines Samples Z. Benzo†*... more ... on the Carryover Effects of Hg During ICP-OES Analysis of Immunoglobulines Samples Z. Benzo†*, M. Quintal†, E. Marcano†, J. Salas†, C. Gómez†, A ... treatment can be reduced to a minimum and which will allow total mercury determina-tion in this type of biological sam-ples is ...

Research paper thumbnail of Determination of trace manganese and Ni in neem oil by ETA-AAS with emulsion sample introduction

Journal of the American Oil Chemists' Society, 2006

An emulsion-based method was developed as an alternative for the introduction of oil-based sample... more An emulsion-based method was developed as an alternative for the introduction of oil-based samples into a graphite furnace to produce a more rapid, precise, and accurate method of analysis. The combination of emulsion sampling and electrothermal atomization for atomic absorption spectroscopy was developed and then applied to the determination of Ni and manganese in neem oil from Venezuela. The optimal concentration of neem oil in the emulsion was 30 and 4% for Ni and Mn, respectively, based on the metal concentration of the neem oil. The stability of the emulsion as a function of time was evaluated. The use of aqueous calibration solutions and the accuracy attained using this method make it attractive for the analysis of oil samples. The metal recovery was between 97 and 101%. Based on the emulsion method, the neem oil samples had 1.39 and 0.21 mg of Mn and Ni per kg of oil, respectively. The wet digestion method indicated a Mn and Ni concentration in the neem oil sample of 1.42 and 0.24 mg/kg, respectively.

Research paper thumbnail of Estudio de los parámetros del plasma fundamentales por HG ICP-OES con un sistema de generación de hidruro doble

Estudio de los parámetros del plasma fundamentales por HG ICP-OES con un sistema de generación de hidruro doble

En este trabajo se realizo un estudio del efecto del hidrogeno producido en la generacion de hidr... more En este trabajo se realizo un estudio del efecto del hidrogeno producido en la generacion de hidruros sobre las caracteristicas del plasma en espectroscopia de emision optica con plasma inductivamente acoplado con un sistema dual-generador de hidruros. Las condiciones de excitacion mejoran en comparacion con la nebulizacion estandar. La temperatura de excitacion, la densidad electronica y la relacion Mg (II)/Mg (I) se incrementaron significativamente cuando el sistema fue operado en el modo dual, incluso a muy bajos flujos de reductor. Las magnitudes de estos parametros aumentaron con el incremento del flujo del reductor y la concentracion acida.

Research paper thumbnail of Hidrogeles de acrilamida/ácido acrílico y de acrilamida/poli(ácido acrílico): Estudio de su capacidad de remediación en efluentes industriales

Revista Latinoamericana De Metalurgia Y Materiales, Jun 14, 2010

Se sintetizaron hidrogeles a partir de persulfato de amonio, N,N´-metilenbisacrilamida (MBAAm), a... more Se sintetizaron hidrogeles a partir de persulfato de amonio, N,N´-metilenbisacrilamida (MBAAm), acrilamida y poli(ácido acrílico),

Research paper thumbnail of Determinación de cobre, magnesio y zinc en leucocitos mononucleares mediante espectrometría de absorción atómica con llama

Investigacion Clinica, Mar 30, 2013

Palabras clave: leucocitos mononucleares, elementos traza, microinyector, espectrometría de absor... more Palabras clave: leucocitos mononucleares, elementos traza, microinyector, espectrometría de absorción atómica. Resumen. En este trabajo se evaluó un nuevo microinyector de inyección en flujo para la determinación de Cu, Mg y Zn en células mononucleares de la sangre. Este dispositivo permitió analizar muestras en el orden de microlitros mediante espectrometría de absorción atómica con llama, es fácil de construir y adaptar al inyector convencional del espectrofotómetro de absorción atómica. En la determinación de Cu, Mg y Zn se obtuvieron límites de detección de 106, 65 y 37 µg L-1 , respectivamente. En las pruebas de recuperación de estos elementos en leucocitos mononucleares se encontraron porcentajes de recuperación entre 98 y 110%. Determination of copper, magnesium and zinc in mononuclear leukocytes by flame atomic absorption spectrometry.

Research paper thumbnail of Influence of the practical resolution on limits of detection using high line number gratings in inductively coupled plasma atomic emission spectrometry

Influence of the practical resolution on limits of detection using high line number gratings in inductively coupled plasma atomic emission spectrometry

Spectrochimica Acta Part B Atomic Spectroscopy, 1991

... Laboratoire des Sciences Analytiques, Universite Claude Bernard-Lyon I, 69622 Villeurbanne Ce... more ... Laboratoire des Sciences Analytiques, Universite Claude Bernard-Lyon I, 69622 Villeurbanne Cedex, France and A. FERNANDEZf and M. MURILLO^ Escuela de ... of the grating (Table 3). Resolution influence on L of D, ICP-AES Table 3. Resultant slit widths (RSW, (Jim) for the ...

Research paper thumbnail of Improvement of the energy transfer with added-hydrogen in inductively coupled plasma atomic emission spectrometry

Spectrochimica Acta Part B Atomic Spectroscopy, 1989

Ahtract-The addition of a small amount of hydrogen (0.05 I min-') in the central channel of an ar... more Ahtract-The addition of a small amount of hydrogen (0.05 I min-') in the central channel of an argon inductively coupled plasma is studied. An improvement of the energy transfer from the ring plasma toward the injected species is observed because of the higher thermal conductivity of hydrogen. Consequences are a higher excitation temperature, a shift downwards of the peak position and the possibility of using a sheathing gas without deterioration of the detection limits.

Research paper thumbnail of Study of the fundamental plasma parameters by HG ICP-OES with a dual hydride generation system

Study of the fundamental plasma parameters by HG ICP-OES with a dual hydride generation system

Avances En Quimica, 2011

Resumen: En este trabajo se realizó un estudio del efecto del hidrógeno producido en la generació... more Resumen: En este trabajo se realizó un estudio del efecto del hidrógeno producido en la generación de hidruros sobre las características del plasma en espectroscopia de emisión óptica con plasma inductivamente acoplado con un sistema dual-generador de hidruros. ...

Research paper thumbnail of Etude et modification du transfert d'energie dans les plasmas induits par haute frequence

Etude et modification du transfert d'energie dans les plasmas induits par haute frequence

Http Www Theses Fr, 1987

Research paper thumbnail of Monitoring of conversion and elimination process of Cr(VI) and Cr(III) in waste water industry by HPLC-ICP-OES

Monitoring of conversion and elimination process of Cr(VI) and Cr(III) in waste water industry by HPLC-ICP-OES

Ciencia, Mar 1, 2005

Research paper thumbnail of Estudio del análisis de muestra metálica de difícil disolución por espectrometría de emisión atómica con plasma de acoplamiento inductivo (EEA-ICP), mediante el empleo de una chispa inmersa en agua

Estudio del análisis de muestra metálica de difícil disolución por espectrometría de emisión atómica con plasma de acoplamiento inductivo (EEA-ICP), mediante el empleo de una chispa inmersa en agua

Research paper thumbnail of Estudio del efecto de algunos iones metálicos monovalentes y divalentes en la fermentación de mostos industriales utilizando una levadura específica

Estudio del efecto de algunos iones metálicos monovalentes y divalentes en la fermentación de mostos industriales utilizando una levadura específica

Research paper thumbnail of Optimization of the tratment of sample of wheat for the analysis of phytic acid by HPLC-RI

Optimization of the tratment of sample of wheat for the analysis of phytic acid by HPLC-RI

Journal of AOAC International

The treatment of samples of wheat prior to the determination of phytic acid by High-Performance L... more The treatment of samples of wheat prior to the determination of phytic acid by High-Performance Liquid Chromatography and refractive index detection was optimized. The drying by lyophilization and oven was studied and better results with the drying by lyophilization were observed, having confirmed that this step is one of the most critical of the process since it is possible to produce significant loss of the analyte. In the extraction step the washing of residue and the collection of this water prior to the process of retention of the phytates in NH2 sep-pak were important. Finally the steps of retention of phytates in NH2 sep-pak and elimination of the HCl did not produce significant loss (P = 0.05) in the phytic acid content of the sample. A recovery of phytic acid of 92% was achieved which is a substantial improvement with respect to that reported by other authors using this methodology.

Research paper thumbnail of STUDY OF NANOSECOND ND: YAG 213 nm LASER ABLATION OF EXTRA HEAVY CRUDE OIL BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY

The Laser-Extra Heavy Crude Oil interaction was studied using a nanosecond Nd:YAG 213 nm laser co... more The Laser-Extra Heavy Crude Oil interaction was studied using a nanosecond Nd:YAG 213 nm laser coupled to an ICP-MS. For this study, ~2.7 g Extra Heavy Crude Oil was mixed with ~3 mL xylene and 0,3 g organic multielemental solution containing 100 µg g-1 of Ag, Al, Ba, Cd, Cr, Cu, Mg, Mn, Mo, Ni, Pb, Sn, Ti, V, and Zn, xylene was left to evaporate at 90 °C and multielemental samples were obtained and analyzed by LA-ICPMS. Laser parameters, such as, ablation gas flow, sample scanning speed, spot size, fluence and focus position were optimized and RSD (n = 8) from 3% to 5% for the net signal of 63 Cu, 95 Mo, 60 Ni and 66 Zn and from 0.9% to 3.3% for the ratios Ni/Mo and Cu/Zn were obtained. Elemental fractionation was observed with both Zn and Cd when fluence was varied. Nevertheless, evidence is not enough to explain results as a consequence of high volatility or high ionization potential (PI) of these elements. Ablation craters obtained show signs of more pronounced thermal processes...

Research paper thumbnail of Avances en Química

Speciation analysis of organomercurial compounds in Fish Tissue by capillary gas chromatography c... more Speciation analysis of organomercurial compounds in Fish Tissue by capillary gas chromatography coupled to microwave-induced plasma atomic emission detection Avances en Química, vol. 3, núm. 2, mayo-agosto, 2008, pp. 59-67 Universidad de los Andes

Research paper thumbnail of Hidrogeles De Acrilamida/Ácido Acrilico y De Acrilamida/Poli(Ácido Acrilico): Estudio De Su Capacidad De Remediación en Efluentes Industriales

Hidrogeles De Acrilamida/Ácido Acrilico y De Acrilamida/Poli(Ácido Acrilico): Estudio De Su Capacidad De Remediación en Efluentes Industriales

Revista Latinoamericana de Metalurgia y Materiales

Hydrogels were synthesized from ammonium persulphate (PSA), N, N'- methylenebisacrylamide (MB... more Hydrogels were synthesized from ammonium persulphate (PSA), N, N'- methylenebisacrylamide (MBAAm), acrylamide and poly(acrylic acid), (AAm / PAAc) varying the acrylamide feeding ratio. The incorporation of AAm and PAAc in the networks was demonstrated by the characterization of the obtained gels with Fourier Transformed Infrared Spectroscopy (FT-IR). Additionally, poly (acrylamide-co-acrylic acid) (AAm/AAc) hydrogels were synthesized and characterized to compare with the interpenetrated networks (IPNs). Absorption studies of pure water and metallic salts aqueous solutions were carried out, observing a larger hydration degree (swelling) when the concentration of PAAc was increased and the percentage of MBAAm decreased. The synthesized hydrogels in a 60/40 ratio, AAm / PAAc showed the best absorption properties, both in water as in metallic (Mg2 +, Cu2 +) solutions. The kinetic parameters showed that the acrylamide favors the absorption speed (k), while the presence of PAAc in the...

Research paper thumbnail of 500L equipo de destilación de cerveza cerveza equipo de fermentación acrílico): Estudio de su capacidad de remediación en efluentes industriales

500L equipo de destilación de cerveza cerveza equipo de fermentación acrílico): Estudio de su capacidad de remediación en efluentes industriales

Revista Latinoamericana de Metalurgia y Materiales, Jun 1, 2010

Research paper thumbnail of Coupled Plasma-Atomic Emission Spectrometry With Slurry Sample Introduction

Coupled Plasma-Atomic Emission Spectrometry With Slurry Sample Introduction

The very high temperatures reached in plasmas make these sources an efficient tool for evaporatin... more The very high temperatures reached in plasmas make these sources an efficient tool for evaporating and atomizing solid materials. However, drawbacks inherent to this technique such as differences in sample transport efficiency, analyte volatility and atomization, and matrix dependency are still problems to be solved. On the other hand, quantification has usually been carried out by comparison with known reference materials and so it appears that the use. of intemal standards would be essential for controlling sorne of the above variables.

Research paper thumbnail of Simultaneous Determination of Nickel, Iron, and Copper in Margarine by Inductively Coupled Plasma–Atomic Emission Spectroscopy after Sample Emulsification

Journal of AOAC INTERNATIONAL, 2002

Nickel, iron, and copper were determined in margarine samples by using emulsification followed by... more Nickel, iron, and copper were determined in margarine samples by using emulsification followed by inductively coupled plasma–atomic emission spectroscopy. Sample treatment and instrumental conditions were optimized, and the results were compared with those obtained by a pseudodigestion method in order to evaluate the compatibility of both methodologies. The optimum amount of margarine in the emulsion was 35% when the surfactant Tween 80 was added as the emulsifier. Copper was below the detection limits of both methodologies, i.e., digestion and emulsion; iron and nickel concentrations found by both methodologies were similar. The detection limits of the emulsion method were 0.002, 0.015, and 0.092 mg/kg for copper, iron, and nickel, respectively. A benefit of the emulsion method is that laborious and lengthy sample digestion procedures are avoided. In addition, accurate and precise results are obtained. Recoveries with the emulsion method ranged from 101 to 104%, with relative stand...

Research paper thumbnail of A Lab‐Built Hydride Generation Nebulizer for AAS

A Lab‐Built Hydride Generation Nebulizer for AAS

Instrumentation Science & Technology, 2007

A nebulizer for the hydride generation atomic‐absorption spectrophotometry of As and Se, and Hg v... more A nebulizer for the hydride generation atomic‐absorption spectrophotometry of As and Se, and Hg vapor generation is described, in which the gas flow, the reductant, and the sample are connected separately through three concentric channels. The sample and the reducing agent flow separately till they reach the air flow. The generated species are then mixed with the air carrier gas

Research paper thumbnail of Influence of additives on the carryover effects of Hg during ICP-OES analysis of immunoglobulines samples

Influence of additives on the carryover effects of Hg during ICP-OES analysis of immunoglobulines samples

Atomic S …, 2000

... on the Carryover Effects of Hg During ICP-OES Analysis of Immunoglobulines Samples Z. Benzo†*... more ... on the Carryover Effects of Hg During ICP-OES Analysis of Immunoglobulines Samples Z. Benzo†*, M. Quintal†, E. Marcano†, J. Salas†, C. Gómez†, A ... treatment can be reduced to a minimum and which will allow total mercury determina-tion in this type of biological sam-ples is ...

Research paper thumbnail of Determination of trace manganese and Ni in neem oil by ETA-AAS with emulsion sample introduction

Journal of the American Oil Chemists' Society, 2006

An emulsion-based method was developed as an alternative for the introduction of oil-based sample... more An emulsion-based method was developed as an alternative for the introduction of oil-based samples into a graphite furnace to produce a more rapid, precise, and accurate method of analysis. The combination of emulsion sampling and electrothermal atomization for atomic absorption spectroscopy was developed and then applied to the determination of Ni and manganese in neem oil from Venezuela. The optimal concentration of neem oil in the emulsion was 30 and 4% for Ni and Mn, respectively, based on the metal concentration of the neem oil. The stability of the emulsion as a function of time was evaluated. The use of aqueous calibration solutions and the accuracy attained using this method make it attractive for the analysis of oil samples. The metal recovery was between 97 and 101%. Based on the emulsion method, the neem oil samples had 1.39 and 0.21 mg of Mn and Ni per kg of oil, respectively. The wet digestion method indicated a Mn and Ni concentration in the neem oil sample of 1.42 and 0.24 mg/kg, respectively.

Research paper thumbnail of Estudio de los parámetros del plasma fundamentales por HG ICP-OES con un sistema de generación de hidruro doble

Estudio de los parámetros del plasma fundamentales por HG ICP-OES con un sistema de generación de hidruro doble

En este trabajo se realizo un estudio del efecto del hidrogeno producido en la generacion de hidr... more En este trabajo se realizo un estudio del efecto del hidrogeno producido en la generacion de hidruros sobre las caracteristicas del plasma en espectroscopia de emision optica con plasma inductivamente acoplado con un sistema dual-generador de hidruros. Las condiciones de excitacion mejoran en comparacion con la nebulizacion estandar. La temperatura de excitacion, la densidad electronica y la relacion Mg (II)/Mg (I) se incrementaron significativamente cuando el sistema fue operado en el modo dual, incluso a muy bajos flujos de reductor. Las magnitudes de estos parametros aumentaron con el incremento del flujo del reductor y la concentracion acida.

Research paper thumbnail of Hidrogeles de acrilamida/ácido acrílico y de acrilamida/poli(ácido acrílico): Estudio de su capacidad de remediación en efluentes industriales

Revista Latinoamericana De Metalurgia Y Materiales, Jun 14, 2010

Se sintetizaron hidrogeles a partir de persulfato de amonio, N,N´-metilenbisacrilamida (MBAAm), a... more Se sintetizaron hidrogeles a partir de persulfato de amonio, N,N´-metilenbisacrilamida (MBAAm), acrilamida y poli(ácido acrílico),

Research paper thumbnail of Determinación de cobre, magnesio y zinc en leucocitos mononucleares mediante espectrometría de absorción atómica con llama

Investigacion Clinica, Mar 30, 2013

Palabras clave: leucocitos mononucleares, elementos traza, microinyector, espectrometría de absor... more Palabras clave: leucocitos mononucleares, elementos traza, microinyector, espectrometría de absorción atómica. Resumen. En este trabajo se evaluó un nuevo microinyector de inyección en flujo para la determinación de Cu, Mg y Zn en células mononucleares de la sangre. Este dispositivo permitió analizar muestras en el orden de microlitros mediante espectrometría de absorción atómica con llama, es fácil de construir y adaptar al inyector convencional del espectrofotómetro de absorción atómica. En la determinación de Cu, Mg y Zn se obtuvieron límites de detección de 106, 65 y 37 µg L-1 , respectivamente. En las pruebas de recuperación de estos elementos en leucocitos mononucleares se encontraron porcentajes de recuperación entre 98 y 110%. Determination of copper, magnesium and zinc in mononuclear leukocytes by flame atomic absorption spectrometry.

Research paper thumbnail of Influence of the practical resolution on limits of detection using high line number gratings in inductively coupled plasma atomic emission spectrometry

Influence of the practical resolution on limits of detection using high line number gratings in inductively coupled plasma atomic emission spectrometry

Spectrochimica Acta Part B Atomic Spectroscopy, 1991

... Laboratoire des Sciences Analytiques, Universite Claude Bernard-Lyon I, 69622 Villeurbanne Ce... more ... Laboratoire des Sciences Analytiques, Universite Claude Bernard-Lyon I, 69622 Villeurbanne Cedex, France and A. FERNANDEZf and M. MURILLO^ Escuela de ... of the grating (Table 3). Resolution influence on L of D, ICP-AES Table 3. Resultant slit widths (RSW, (Jim) for the ...

Research paper thumbnail of Improvement of the energy transfer with added-hydrogen in inductively coupled plasma atomic emission spectrometry

Spectrochimica Acta Part B Atomic Spectroscopy, 1989

Ahtract-The addition of a small amount of hydrogen (0.05 I min-') in the central channel of an ar... more Ahtract-The addition of a small amount of hydrogen (0.05 I min-') in the central channel of an argon inductively coupled plasma is studied. An improvement of the energy transfer from the ring plasma toward the injected species is observed because of the higher thermal conductivity of hydrogen. Consequences are a higher excitation temperature, a shift downwards of the peak position and the possibility of using a sheathing gas without deterioration of the detection limits.

Research paper thumbnail of Study of the fundamental plasma parameters by HG ICP-OES with a dual hydride generation system

Study of the fundamental plasma parameters by HG ICP-OES with a dual hydride generation system

Avances En Quimica, 2011

Resumen: En este trabajo se realizó un estudio del efecto del hidrógeno producido en la generació... more Resumen: En este trabajo se realizó un estudio del efecto del hidrógeno producido en la generación de hidruros sobre las características del plasma en espectroscopia de emisión óptica con plasma inductivamente acoplado con un sistema dual-generador de hidruros. ...

Research paper thumbnail of Etude et modification du transfert d'energie dans les plasmas induits par haute frequence

Etude et modification du transfert d'energie dans les plasmas induits par haute frequence

Http Www Theses Fr, 1987

Research paper thumbnail of Monitoring of conversion and elimination process of Cr(VI) and Cr(III) in waste water industry by HPLC-ICP-OES

Monitoring of conversion and elimination process of Cr(VI) and Cr(III) in waste water industry by HPLC-ICP-OES

Ciencia, Mar 1, 2005

Research paper thumbnail of Estudio del análisis de muestra metálica de difícil disolución por espectrometría de emisión atómica con plasma de acoplamiento inductivo (EEA-ICP), mediante el empleo de una chispa inmersa en agua

Estudio del análisis de muestra metálica de difícil disolución por espectrometría de emisión atómica con plasma de acoplamiento inductivo (EEA-ICP), mediante el empleo de una chispa inmersa en agua

Research paper thumbnail of Estudio del efecto de algunos iones metálicos monovalentes y divalentes en la fermentación de mostos industriales utilizando una levadura específica

Estudio del efecto de algunos iones metálicos monovalentes y divalentes en la fermentación de mostos industriales utilizando una levadura específica

Research paper thumbnail of Optimization of the tratment of sample of wheat for the analysis of phytic acid by HPLC-RI

Optimization of the tratment of sample of wheat for the analysis of phytic acid by HPLC-RI

Journal of AOAC International

The treatment of samples of wheat prior to the determination of phytic acid by High-Performance L... more The treatment of samples of wheat prior to the determination of phytic acid by High-Performance Liquid Chromatography and refractive index detection was optimized. The drying by lyophilization and oven was studied and better results with the drying by lyophilization were observed, having confirmed that this step is one of the most critical of the process since it is possible to produce significant loss of the analyte. In the extraction step the washing of residue and the collection of this water prior to the process of retention of the phytates in NH2 sep-pak were important. Finally the steps of retention of phytates in NH2 sep-pak and elimination of the HCl did not produce significant loss (P = 0.05) in the phytic acid content of the sample. A recovery of phytic acid of 92% was achieved which is a substantial improvement with respect to that reported by other authors using this methodology.