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首页> 外文期刊>International Journal of Environmental Research and Public Health >Sorption Kinetics of Escherichia coli and Salmonella sp on Two Soil Layers Associated with a Groundwater Table in Yaounde, Cameroon (Central Africa)
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Sorption Kinetics of Escherichia coli and Salmonella sp on Two Soil Layers Associated with a Groundwater Table in Yaounde, Cameroon (Central Africa)

机译：喀麦隆雅温得（中部非洲）与地下水位相关的两个土壤层上大肠杆菌和沙门氏菌的吸附动力学

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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.
机译：在喀麦隆雅温得（中非）地下水位上方的两个土壤层（HX和HY）上进行了实验室研究。这项研究的主要目的是评估大肠杆菌和沙门氏菌的保留潜力或吸附动力学。在这些土壤层上。对于这两个土壤层，细菌和土壤颗粒在水性介质中孵育的前30分钟内，细菌对土壤颗粒的吸附迅速发生，并且随着孵育时间的延长（直至300分钟）逐渐增加。在某些情况下，孵育30分钟后，吸附速率会发生波动，这可能是由于细菌细胞对土壤颗粒的吸附和解吸。使用Freundlich等温线，注意到与吸附能力相关的吸附系数在19至4026 E. coli.mg-1土壤和506至847 Salmonella sp.mg-1土壤之间变化。对于这两种细菌，HY层（紧邻水位）的吸附系数均大于HX（位于HY层上方）的吸附系数，并且似乎与pH值和N / P比呈正相关，并且与与C / N和C / P比值负相关。与吸附强度有关的线性系数，对于大肠杆菌，从0.5841到1.0023，对于沙门氏菌，从0.7068到1.5236。土壤颗粒的理化特性似乎影响细菌在土壤上的吸附动力学。

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