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    Abstract
2011 (Vol. 3, Issue: 2)
Article Information:

Clay Mineralogy and Vertical Distribution of Lead, Zinc and Copper in a Soil Profile in the Vicinity of an Abandoned Treatment Plant

L. Matini, J.M. Moutou, P.R. Ongoka and J.P. Tathy
Corresponding Author:  Matini Laurent 

Key words:  Clay, heavy metals, pollution, soil, XRD analysis, ,
Vol. 3 , (2): 114-123
Submitted Accepted Published
2010 November, 03 2010 December, 02 2011 March 05
Abstract:

The aim of this study was to determine Pb, Zn and Cu content and the clay mineral responsible of their vertical distributions, on spoil heap in the vicinity of an abandoned treatment plant of lead ore located in Mfouati, south east of Congo-Brazzaville. Lead, zinc and copper contents were determined by ICP in a soil profile of a slag heap at different depths (15-45, 45-75, 75-105, 105-135 and 135-150 cm) in the bulk samples and in the clay fractions, respectively. The geochemical study of the soil profile at the different depths has revealed greater amount of Pb, Zn and Cu in the bulk samples and the clay fractions. Pb, Zn and C u contents decreased in the soil profile as: 11800-2000, 2400-1200 and 270-90 mg/kg in the bulk samples and 6652-2049, 3049-1670 and 495-212 mg/kg in the clays fractions, respectively. Zn and Cu contents in the clay fractions w ere higher than in the bulk samples in all the profile, except for Pb. Soil sam ples in the profile were slightly acidic in nature, with pH values ranged from 5.69 to 6.25. CEC was correlated with clay fraction. XRD analysis of the clay fractions at the different depths has revealed the clay minerals such as talc in higher amount, kaolinite, chlorite and smectite in lower amounts. Kaolinite (1:1 type clay minerals) was more present in all the soil profile in high amount than chlorite and smectite and could control the vertical migration of Pb, Zn and Cu.
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  Cite this Reference:
L. Matini, J.M. Moutou, P.R. Ongoka and J.P. Tathy, 2011. Clay Mineralogy and Vertical Distribution of Lead, Zinc and Copper in a Soil Profile in the Vicinity of an Abandoned Treatment Plant.  Research Journal of Environmental and Earth Sciences, 3(2): 114-123.
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