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Environmental pollutions impacts on the bacteriological and physicochemical quality of suburban and rural groundwater supplies in Marrakesh area (Morocco)

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Abstract

This study scrutinized bacteriological and chemical quality of groundwater supplies of Marrakesh (Morocco) within a year. It assessed the influence of some chemical factors on fecal and opportunistic pathogenic bacterial communities. The annual average densities of fecal coliforms, fecal streptococci and Pseudomonas aeruginosa were respectively: 1891 colony forming units (CFU)/100 mL, 1246 CFU/100 mL and 206 CFU/100 mL. The total occurrence of these bacteria during the period of study was 94%. Detectable non-O1 Vibrio cholerae was present in 81% of samples and the mean abundances ranged from 0 to 11100 MPN/100 mL. Significant correlations between fecal coliforms and streptococci and between fecal coliforms and non-O1 V. cholerae (p < 0.01) were found. Fecal coliforms can be used to detect the presence of non-O1 V. cholerae in this groundwater. These well waters were greatly mineralized, hard, salt with high concentrations of nitrogenous ions and major elements (Ca2+, Na+, Cl−, \({\text{SO}}_{\text{4}}^{{\text{2 - }}} \) and K+). Most of chemical parameters were relatively steady with time except for calcium, ammonium, nitrites and organic matter which were seasonally influenced. The degree of correlation between chemical parameters and the abundances of isolated bacteria is heterogeneous. The concentrations of calcium and nitrites favored (p < 0.01) the abundance of fecal coliforms and streptococci, but reduced P. aeruginosa abundances. Calcium, salinity, chlorides, nitrites and nitrates tests can be used for screening in situ when the laboratory facilities are limited. This work is expected to assist local authorities in developing plans and actions to reduce the pollution to acceptable levels.

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Authors and Affiliations

  1. Laboratory of Biology and Biotechnology of Microorganisms, Department of Biology, Faculty of Sciences Semlalia, University Cadi Ayyad, Prince My Abdallah, P.O. 2390, Marrakesh, 40000, Morocco

    H. Lamrani Alaoui, K. Oufdou & N. Mezrioui

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  1. H. Lamrani Alaoui
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  2. K. Oufdou
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  3. N. Mezrioui
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Correspondence to N. Mezrioui.

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Lamrani Alaoui, H., Oufdou, K. & Mezrioui, N. Environmental pollutions impacts on the bacteriological and physicochemical quality of suburban and rural groundwater supplies in Marrakesh area (Morocco). Environ Monit Assess 145, 195–207 (2008). https://doi.org/10.1007/s10661-007-0029-0

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