Zur Multi-Elementanreicherung aus eisenhaltigen Böden und Sedimenten

Summary

Traces of Ag, Bi, Cd, Co, Cu, Hg, In, Mo, Ni, Pb, Se, and Zn can be preconcentrated with recoveries R_s ⩾ 95% from soils and sediments of high iron content by collector precipitation with hexamethylene-ammonium-hexamethylenedithiocarbamate and with a small amount of the iron as a collector element. The trace concentrates are analyzed by AAS and XRF. The relative standard deviation of the combined method of sample decomposition, preconcentration and AAS determination (n = 12) is generally about 0.03; the limit of detection (3 s, n = 20) for different elements was found to be between 0.1 and 1 μg·g⁻¹. The accuracy of the method was verified by certified standard material. The power of detection of XRF for the analysis of trace concentrates obtained from soils and sediments is only sufficient for some of the interesting elements.