Abstract
The efficiency of density separation and of a number of different chemical extraction methods to extract pyrite and associated trace metals from sediments having high organic matter contents were investigated. All chemical extraction methods tested were suitable for pyrite determinations but overestimated the associated trace metal (Co, Cu, Mn, Ni, Pb, and Zn) concentrations presumably due to interferences produced by simultaneous extraction of trace metals associated with organic matter. Concentrations of trace metals associated to pyrite in the bulk sediment can best be determined from the pyrite-trace metal/pyrite-Fe ratios obtained by density separation and the total concentration of pyrite in the sediment obtained by the chemical extraction methods
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