Sorption Kinetics of Escherichia coli and Salmonella sp on Two Soil Layers Associated with a Groundwater Table in Yaounde, Cameroon (Central Africa)

Moïse Nola, Thomas Njiné, Claude Boutin, Pierre Servais, Mohamed Messouli, Louise Marie Ngo Bidjeck, Adolphe Monkiedje, Serge H. Zébazé Togouet and Norbert Kemka
Additional contact information
Moïse Nola: University of Yaounde 1, Faculty of Sciences, Laboratory of General Biology, P.O. Box 812 Yaounde, Cameroon
Thomas Njiné: University of Yaounde 1, Faculty of Sciences, Laboratory of General Biology, P.O. Box 812 Yaounde, Cameroon
Claude Boutin: Université Paul Sabatier CNRS, Laboratoire d’Ecologie Terrestre, UMR 5552, 118 Route de Narbonne, Bât. 4 R3, 31062 Toulouse Cedex 4, France
Pierre Servais: Université Libre de Bruxelles, Ecologie des Systèmes Aquatiques, Campus de la Plaine CP 221, Boulevard du Triomphe, 1050 Bruxelles, Belgium
Mohamed Messouli: Université Cadi Ayyad, Faculté des Sciences Semlalia, Laboratoire d’Hydrobiologie et Ecologie Souterraine, B.P. 2390 Bd Moulay Abdellah, Marrakech, Marocco
Louise Marie Ngo Bidjeck: University of Yaounde 1, Faculty of Sciences, Laboratory of Applied Geology, P.O. Box 812 Yaounde, Cameroon
Adolphe Monkiedje: University of Yaounde 1, Faculty of Sciences, Laboratory of General Biology, P.O. Box 812 Yaounde, Cameroon
Serge H. Zébazé Togouet: University of Yaounde 1, Faculty of Sciences, Laboratory of General Biology, P.O. Box 812 Yaounde, Cameroon
Norbert Kemka: University of Yaounde 1, Faculty of Sciences, Laboratory of General Biology, P.O. Box 812 Yaounde, Cameroon

IJERPH, 2005, vol. 2, issue 3, 1-9

Abstract: A laboratory study has been carried out on two soil layers (HX and HY) located above a groundwater table in Yaounde, Cameroon (Central Africa). The main purpose of this study was to assess the retention potential or sorption kinetics of Escherichia coli and Salmonella sp. on these soil layers. For both soil layers, bacterial sorption on soil particles occurred rapidly during the first 30 minutes of incubation of bacteria and soil particles in aqueous media, and increased gradually with incubation time up to 300 min. In some cases, adsorption rates fluctuated after 30 min of incubation, probably due to bacterial cell sorption to and de-sorption from soil particles. Using Freundlich isotherms, it was noted that adsorption coefficient related to adsorption capacity varied from 19 to 4026 E. coli .mg -1 of soil, and from 506 to 847 Salmonella sp. mg -1 of soil. For both bacterial species, the adsorption coefficient of layer HY (located in close proximity of the water table) was greater than that of HX (located above layer HY) and seemed to positively correlate with the pH values and N/P ratios, and to negatively correlate with the values of C/N and C/P ratios. The linearity coefficient related to adsorption intensity varied from 0.5841 to 1.0023 for E. coli , and from 0.7068 to 1.5236 for Salmonella sp. The physico-chemical characteristics of soil particles seemed to influence the sorption kinetics of bacteria on soil.

Keywords: soil sorption kinetics; Escherichia coli; Salmonella sp (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2005
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