Journal
ENVIRONMENTAL MONITORING AND ASSESSMENT
Volume 186, Issue 7, Pages 4591-4603Publisher
SPRINGER
DOI: 10.1007/s10661-014-3722-9
Keywords
Bioavailability; Cadmium; Correlation; Geochemical characteristics; Jamaican soils; Yam
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Funding
- University of the West Indies, Mona
- Government of Jamaica through the Ministry of Science Technology Energy and Mining
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Extraordinary geogenic concentrations of cadmium (Cd) have been reported for some Jamaican soils. However, the bioavailability of the metal in these soils remains unknown. Here, the bioavailability of Cd in selected Jamaican soils was investigated through the determination of total and sequentially extractable concentrations in paired soil-plant (yam; Dioscorea sp.) samples (n = 24), using neutron activation analysis and atomic absorption spectroscopy as primary analytical techniques. Our results indicate that total soil Cd varied widely (2.2-148.7 mg kg(-1)), and on average, total extractable Cd accounted for similar to 55 % of the total soil Cd. The exchangeable and oxidizable species averaged 1.5 and 6.4 % of the total Cd, respectively, and, based on Spearman analysis, are the best predictors of yam Cd. There is also good evidence to suggest that variation in the bioavailability of the metal is in part controlled by the geochemical characteristics of the soils analyzed and is best explained by pH, cation exchange capacity (CEC) and organic matter content (% LOI).
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