Samuel PARE | Ouagadougou University (original) (raw)

Papers by Samuel PARE

Water and wastewater studies in Burkina Faso have revealed high levels of heavy metals in most st... more Water and wastewater studies in Burkina Faso have revealed high levels of heavy metals in most streams and other water bodies particularly within urban areas and mining society’s area. The metals are produced and released by anthropogenic source during industrial and agricultural activities, and also in vehicular emissions. These metals may pose serious threats to both human health and the environment. This study investigated the potential of natural mixed clay, KORO, from Burkina Faso, in removing, Cu2+, Pb2+, and Cr3+ cations from aqueous solutions using batch equilibrium technique. Qualitative mineralogical characterisation of the clay by XRD revealed that the clay contains montmorillonite, quartz, albite, illite, kaolinite, goethite and orthose. pHpzc for the clay, as determined by potentiometric titrations, was 7.31. pH metal sorption dependence of the clay revealed that for an aqueous solution of 0.06 mol/l, 0.048 mol/l and 0.096 mol/l respectively in Cu2+, Pb2+ and Cr3 remova...

International Journal of Multidisciplinary Research and Development, 2020

International journal of innovation and scientific research, Jul 2, 2021

European Scientific Journal, ESJ, 2022

L’objectif général poursuivi est d’analyser la perception des aléas climatiques auprès des exploi... more L’objectif général poursuivi est d’analyser la perception des aléas climatiques auprès des exploitants en milieu urbain. Pour ce faire, des entretiens semi-structurés et des enquêtes ont été effectués. Au total 140 exploitants disponible ont été enquêtés. Un critère d’âge de sélection des exploitants variant de 15 à 50 ans a permis de s’assurer que les stratégies développées font suite à une perception effective des changements. L’analyse des données a été faite par le logiciel Access et Excel pour le calcul des paramètres statistiques descriptifs et la réalisation de graphiques. Ces derniers observent l’existence des paramètres climatiques qui interviennent dans leur pratique à 90%. Les résultats de la recherche révèlent que 66 % des exploitants ont un niveau d’instruction assez bas. Face aux aléas climatiques les exploitants mettent en œuvre des stratégies durables d’adaptations qui participent à l’amélioration des rendements.80 % des exploitants font recourt aux variétés locales...

An overview of freshwater quality in West and Central Africa is proposed by reviewing recent sele... more An overview of freshwater quality in West and Central Africa is proposed by reviewing recent selected literature. Water quality degradation in the region is mainly attributable to: anthropogenic activities, communities’ socio-economic conditions and natural sources. Surface and groundwater contamination by organic matters, Escherichia coli, nitrates, phosphates, pesticides, hydrocarbons, heavy metals and fluorine ions are reported. In cash crop production areas, the large quantities of pesticides and fertilizers used explain residues in the ground and surface water in many countries. Unsafe domestic wastes are an important source of water pollution in capital cities due to overcrowding, poverty, and low sanitation in precarious neighbourhood areas. Eutrophication is seasonally observed in lakes or lagoons with high concentrations of nitrates in urban areas. The challenges to overcome are a promotion of strategic research with a high diffusion level, pollution prevention measures whi...

This study on the production of activated carbons (AC) prepared through chemical activation using... more This study on the production of activated carbons (AC) prepared through chemical activation using sodium hydroxide solution consisted to evaluate the effect of temperature using two values (500°C and 650°C). The characterization of the AC were carried out using Brunauer-Emmett-Teller (BET) experiments, Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and Fourier TransformInfrared (FT-IR). A comparison of pore characteristics with UIPAC’s norms showed that all the produced carbons were mesoporous and both carbons had low surface areas of 12.13 and 29.45 m/g for AC1 and AC2, respectively; AC1 and AC2 being AC prepared at 500°C and 650°C, respectively. Low surface areas were due to the activation solution and the temperature of pyrolysis of biomass which affect strongly the characteristics of carbon. At Zero Point Charge, pH of both carbons is too closed and basic indicating their ability to fix cationic species on their surface.

Arsenic pollution is one of issues for drinkable water supply in rural areas of Burkina Faso. The... more Arsenic pollution is one of issues for drinkable water supply in rural areas of Burkina Faso. The objective of this study was to look for a cheap technology for a better treatment of enriched arsenic water up to the admissible value (10 µg/L) in drinking water. To fulfil this objective, two mixed materials were prepared using a solid / solid mixture between laterite soil and granular ferric hydroxide for arsenic adsorption. Chemical analysis of laterite soil indicated a high amount of iron, aluminum and silicon. Batch experiments were conducted for As(V) adsorption using aqueous solutions. Results showed that the adsorption of arsenic (V) was strongly influenced by contact time, initial pH, adsorbent amount and initial As(V) concentration requiring their optimization. Indeed, the increase of the contact time between 5 and 90 min involved an increase of adsorption capacity up to 49.47µg/g while a change of initial pH caused a variation of adsorption capacity from 49 to 42.38 µg/g. An...

Journal of Environmental Chemistry and Ecotoxicology, 2017

Chromium(III), copper(II) and lead(II) are among the heavy metals produced and released in large ... more Chromium(III), copper(II) and lead(II) are among the heavy metals produced and released in large amounts by anthropogenic sources worldwide, including Burkina Faso. Previous studies have demonstrated the successful application of domestic natural mixed clays for the removal of these metal ions as a cheap and environmentally friendly method. Qualitative mineralogical characterization of the clays revealed that they consist of kaolinite, illite, orthrose and quartz, and minor quantities of albite and montmorillonite. pH PZC for the clays, as determined by potentiometric titrations, are in the range 6.8 to 7.3. In this study, the interactions of chromium(III), copper(II) and lead(II) ions with these clay minerals were examined by the use of extended X-ray absorption fine structure (EXAFS) spectroscopy. Cr 3+ forms tetrameric hydrolysis complexes on the mineral surface with a Cr-O bond distance of 1.98 Å, and two Cr•••Cr distances at 3.02 and 3.62 Å. This is indicative of a tetrameric [Cr 4 (OH) 6 (H 2 O) 12 ] 6+ entity bound to the clay mineral surface. A distance of 3.17 Å, regarded as a Cr•••Fe distance, indicates that one Cr 3+ ion in the hydrolyzed tetramer binds to two oxygens in the mineral surface which are bound to either one or two iron(III) ions in the surface. Pb 2+ binds two oxygen atoms at an average bond distance of 2.31 Å, with a significant contribution of linear multiple scattering from the PbO 2 entity. The EXAFS results of Cr 3+ sorption are consistent with the presence of a hydrolysis product of polymeric Cu 2+ species with a surface complex or precipitate.

Toxicological & Environmental Chemistry, 2016

ABSTRACT Arsenic (V) adsorption on manganese oxide coated rice wastes was investigated in this st... more ABSTRACT Arsenic (V) adsorption on manganese oxide coated rice wastes was investigated in this study. The modified adsorbents were characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, and pH measurements to determine the point of zero charge. Batch adsorption equilibrium experiments were conducted to study the effects of pH, contact time, and initial concentration on arsenic removal efficiency. The adsorption capacity of rice waste was significantly improved after modification with permanganate. The Langmuir isotherm model fitted the equilibrium data better than the Freundlich model which confirms surface homogeneity of the adsorbent. Maxima adsorption capacities are determined as 10 and 12 mg/g at pH 3 for manganese oxide coated rice husk and straw, respectively. The adsorption energy indicates that the adsorption process may be dominated by chemisorption. Pseudo-second-order rate equation described the kinetics sorption of arsenic with good correlation coefficients, better than a pseudo-first-order equation. Manganese oxide coated rice husk and straw appear to be promising low cost adsorbents for removing arsenic from water.

Journal of Environmental Hydrology

1 In the southwestern part of Burkina Faso, sugar cane is intensively cultivated by the SN-SOSUCO... more 1 In the southwestern part of Burkina Faso, sugar cane is intensively cultivated by the SN-SOSUCO society (Nouvelle Société Sucrière de la Comoé) which is the largest private employer in the country. The sugar cane is grown on an area covering about 3850 ha. The intensive cultivation of the sugar cane is all the year round and involves the use of pesticides for pest control and to reduce the production losses. Groundwater risk assessment by pesticides used in the SN-SOSUCO cultivated area during the season 2007-2008 was the goal of the present study. Both Pesticide Impact Rating Index (PIRI) software developed by CSIRO Australia and the Groundwater Ubiquity Score (GUS) were used for the evaluation of the thirteen pesticides used by the society. Pichloram, carbofuran, trichlopyr, monosodium methanarsonate (MSMA) and the chlorimuron-ethyl have high leaching potential according to GUS index, and MSMA has mean risk of mobility to groundwater as shown by PIRI. To prevent groundwater poll...

CLEAN - Soil, Air, Water, 2014

One consequence of the shift in land use from traditional food production to cotton production in... more One consequence of the shift in land use from traditional food production to cotton production in West Africa is the application of different pesticides. The influence of this practice on the formation of pesticide residues in soils and sediments of seasonal dry pools was investigated in 2008 and 2009 in the region of the Pendjari biosphere reserve in Benin. The protected park area, the buffer zone with some sporadic agricultural practice and the agricultural zone of the Pendjari region were compared. GC-electron capture detector method was used to analyze selected pesticides covering the officially supplied pesticides and some organochlorine compounds. Residues of aand b-endosulfan, endosulfan sulfate, chlorpyrifos, p,p 0-dichlorodiphenyldichloroethane, p,p 0-dichlorodiphenyldichloroethylene (DDE) were detected in soils of cotton fields and in sediments from adjacent pools within the agricultural and buffer zone. Concentrations were in the range of below detection limit (DL) to 150 mg/kg dry mass (dm) for endosulfan and endosulfan sulfate together and of below DL to 12 mg/kg dm for chlorpyrifos. In pool sediments, concentrations of total endosulfan were in a range of below DL to 47 mg/kg dm. The occurrence of the pesticides was directly linked to the cotton growing season. No residues were detected at the beginning of cotton growing season. Concentration levels of p,p 0-DDE were in the range of below DL to 12 mg/kg dm. No pesticide residues were found in the protected park zone.

Received: 11/02/2016 Accepted: 18/03/2016 Published: 30/06/2016 Abstract This work aims to study ... more Received: 11/02/2016 Accepted: 18/03/2016 Published: 30/06/2016 Abstract This work aims to study the As (V) removal in aqueous solutions using Granular Ferric Hydroxide (GFH) and Natural Laterite at ambient temperature. Column experiments were conducted to investigate the As (V) removal mechanism and effects of parameters affecting the adsorption were studied to follow the adsorption kinetics. Maximum removal of arsenic (99.99% and 99.5%) was achieved at 15 min of contact time with an initial concentration of 20 mg/L using 10 g of GFH and laterite in 50 ml volume of solution, respectively. From the isotherm models study, i.e. Langmuir, Freundlich and Dubinin Radushkevich, the adsorption process in our study followed best Freundlich isotherm. The study of isotherms showed that the adsorption was physical, spontaneous with GFH while endothermic using laterite, respectively. The kinetics study showed that the adsorption process fits with a pseudo-second order reaction model using both ...

Journal of Analytical and Applied Pyrolysis, 2013

In this study, activated carbon synthesised from corncob waste was utilised as an adsorbent to re... more In this study, activated carbon synthesised from corncob waste was utilised as an adsorbent to remove Cr(III) from aqueous solution. The adsorption behaviour of Cr(III) was studied under different conditions, including solution pH, and metal concentration. Ground corncobs were modified with sulphuric acid and phosphoric acid, and the activated carbons were modified by thermal treatment to analyse the adsorption capacity of Cr(III). Results showed that Cr(III) adsorption on the activated carbons obtained from corncobs are pH-dependent and thermal treatment dependent. The maximum Cr(III) adsorption capacity q max calculated from the Langmuir isotherm was 84.5463 mg/g from the activated carbon TM8. The SEM and Fourier transform infrared spectroscopy (FT-IR) analysis showed the development and modification of porosity in the different samples.

Journal of Environmental Hydrology Volume 20 Paper 16 December 2012 1 One consequence of land use... more Journal of Environmental Hydrology Volume 20 Paper 16 December 2012 1 One consequence of land use for industrial sugar cane production by the SN-SOSUCO society (Nouvelle Societe Sucriere de la Comoe) in the South Western part of Burkina Faso is the application of different pesticides. In our continued work on evaluating the contamination risk of pesticides to water resources, this study aimed to assess the risk of surface water contamination during the season 2007-2008. The risk was evaluated using the Pesticide Impact Rating Index (PIRI) software developed by CSIRO Australia, with the assumption of three scenarios taking into account soil organic matter content and the presence of a buffer zone. The results show that of the 13 pesticides applied, 4 (acetochlor, metribuzin, MSMA, terbufos) had very high potential and 4 (glyphosate, pendimethalin, MCPA, diuron) had high potential to contaminate surface water under actual usage conditions. Likewise, chlorimuronethyl, carbofuran, trich...

French-Ukrainian Journal of Chemistry

This work was focused on laterite soil as adsorbent for the removal of arsenic and phosphate from... more This work was focused on laterite soil as adsorbent for the removal of arsenic and phosphate from groundwater using column experiments. Results revealed a decrease of arsenic removal efficiency from 100 to 79% with flow rate increasing. Maximum removal of 100% for arsenic and 85% for phosphates was obtained for pH values between 3.5 and 6. The increase of initial arsenic concentration and phosphate amount caused an increase of arsenic adsorption up to 24 µg/g while 58.5 µg/g for phosphate. NaOH solution could desorb 86.8% of arsenic and the reuse of regenerated laterite indicated its efficiency in same experimental conditions.

Revue des sciences de l'eau

Endosulfan (isomers α and β) and endosulfan-sulfate residues were determined in soils samples col... more Endosulfan (isomers α and β) and endosulfan-sulfate residues were determined in soils samples collected from three cotton-producing areas. Sampling during raining season (June/July) and beginning of dry season (November) have been done in conventional cotton, bio-cotton and sesame fields in 2007. Both isomers α and β-endosulfan and it degradation product endosulfan sulfate were detected in all soils samples. The occurrence of endosulfan residues in bio-cotton and sesame fields is random, whereas it increased from the cotton-growing period to the dry season in the conventional cotton fields. Endosulfan residues concentration in soils depends on the farmer practices and the season.