Trace Metal Speciation of USGS Reference Sample MAG-I |
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Authors: | A. TESSIER P.G.C. CAMPBELL M. BISSON |
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Affiliation: | Universitédu Québec, INRS-Eau, C.P. 7500, Sainte-Foy, Québec G1V 4C7, Canada |
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Abstract: | The USGS reference sample marine mud MAG-1 has been subjected to a sequential extraction procedure designed to partition the constituent trace metals into five fractions: I-exchangeable; II- bound to carbonates; III-bound to Fe-Mn oxides; IV- bound to organic matter; V- residual. The analytical approach involved successive chemical extractions and the subsequent determination of trace metal concentrations (Co, Cu, Ni, Pb, Zn; Fe, Mn) in the leachates by atomic absorption spectrophotometry. The chemical speciation results obtained on four replicate sub-samples demonstrate that the coefficients of variation for metal concentrations in the individual fractions are generally better than + 10%. Comparison with published values for total trace metal concentrations in the MAG-1 sample suggests that the overall accuracy of the chemical extraction procedure is satisfactory. |
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