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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