Dosage d'elements traces dans les sediments de cours d'eau et les boues de stations d'epuration. comparaison inter‐laboratoires de diverses methodes de mineralisation trace metal determination in river sediments and sewage sludges. inter laboratory comparison of extraction techniques

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Abstract
Five techniques for preparing river sediments and sewage sludges for atomic absorption spectrometry determination of Cd, Pb, Ni, Cu, Zn and Cr are evaluated. The results obtained with 4 samples by 14 laboratories are compared statistically. The method involving dry ashing at 550.degree. C followed by leaching with a mixture of hydrochloric and hydrofluoric acids was found to be the best technique.