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СНПЧ А7 Курск, обзоры принтеров и МФУ

HEAVY METAL STATUS IN THE RIO DEL REY MANGROVES OF CAMEROON

By Aaron Suh Tening1*, Godswill Azinwie Asongwe2 George Bindeh Chuyong3, Beatrice Ambo Fonge3 and Antoine David Mvondo-Ze2     

Abstract

This study examined some heavy metal concentrations in Rivers Meme and Ndian of the Rio del Rey mangroves of Cameroon. This was necessitated by the use of these rivers and some streams feeding them for livelihood, despite severe anthropogenic influences. Forty water samples from varied depths were collected in August 2009 and analysed for heavy metal accumulation. Six top soil samples from the catchment areas were also analysed using standard methods. Very high concentrations (16.19 to 20.50 mg/L) of Zn were obtained in some sites of River Meme. Lead concentrations were significantly (P < 0.05) lower than the maximum allowable concentrations for drinking water in both rivers. River Meme as opposed to River Ndian had higher concentrations in streams than in wells. Insignificant negative correlations existed between Cd and depth, depicting anthropogenic origin dominance in River Meme as opposed to River Ndian. Principal component analysis equally suggested this dominance. There was an insignificant (P>0.05) positive correlation (r = 0.2575) between the cation exchange capacity and organic matter of the soils in the Rio del Rey mangrove ecosystem. This makes the mangrove ecosystem vulnerable to increase anthropogenic activities. Separate policies adoptions for the management of both rivers are thus recommended

Keyword: Heavy metals, Rio del Rey Mangroves, soils, policy recommendations  Download



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