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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 19, No. 4, 2015, pp. 659-663
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Bioline Code: ja15083
Full paper language: English
Document type: Research Article
Document available free of charge
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Journal of Applied Sciences and Environmental Management, Vol. 19, No. 4, 2015, pp. 659-663
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Assessment of the effects of cadmium and lead on pH and cation exchange capacity of soil under different plant canopy in the tropical wet-and dry climate.
ERUOLA, A. O.; AZIKE, N. I. & OGUNYEMI, I. O.
Abstract
The effects of heavy metals pollution on agricultural produce can not be over
emphasize. To estimate the effect of heavy metal on pH and Cation Exchange Capacities of
soil on incubation, relationships between availability of metals in soil after contamination
were investigated for a range of soils and metals. Three concentrations (0 mg/kg, 2 mg/kg
and 5 mg/kg) of lead and cadmium were added as nitrate solution as single and combine
treatments to six soil samples under different plant canopy. The soils-metal were incubated
at field capacity for 8 weeks under 25°C. The exchangeable bases in soils were determined
in IM ammonium acetate (pH 7.0) extract by FAAS and pH by pH meter with a combination
electrode. The treatment is arranged in randomised complete design each in triplicates. The
pH decreased from 7.02 to 6.70 and 6.63. Cation Exchange Capacities decreased from range
of of 6.62 to range of 4.71 and 3.10 C mol kg-1 under single and combined treatments
respectively for the six locations. These results enable us to understand natural attenuation of
metal contamination and also to assess the risk of soil contamination by determining effects
of metals reactions with CEC and pH in 8-weeks incubated soils after artificial
contamination.
Keywords
heavy metals; Incubation process; pH and CEC
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