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Assessment of the hierarchical involvement of chemical characteristics of soil layer particles during bacterial retention in Central Africa

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The main purpose of this investigation was to rank, in hierarchical order, some soil chemical factors that impact the sorption parameters of fecal indicator bacteria and Salmonella sp, during their transfer from soil surface to the groundwater table. Sorption coefficients (K
f
) and linearity exponents (Ϫ) were obtained using the Freundlich isotherm. When Salmonella sp was present alone, the values of K
f
varied from 2.70 log units mg
−1
to 7.84 log units mg
−1
of soil, and Ϫ varied from 0.04 to 2.70. When the two fecal indicator bacteria were present, K
f
varied from 0.48 log units mg
−1
to 8.53 log units mg
−1
of soil, and Ϫ varied from 0.06 to 1.19. When fecal indicator bacteria and Salmonella sp were mixed, K
f
varied from 1.73 log units mg
−1
to 7.70 log units mg
−1
of soil, and Ϫ varied from 0.09 to 0.88. The predominant factors controlling each sorption parameter varied with respect to soil layer and the bacterial species involved.

Keywords: Salmonella sp, fecal indicator bacteria, soil particles, sorption, predominant factors, Central Africa, soil layers, groundwater table, chemical factors

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