L-cysteine enhanced hydride generation for atomic fluorescence spectrometric determination of germanium in geological samples

摘要

L-cysteine enhanced the analytical signal in the hydride generation-atomic fluorescence spectrometric determination of germanium. In addition. it reduced or eliminated interferences from coexistent ions such as Cr (VI), Se4+, Te4+, Pb2+, Cu2+, and Ni+2 in aqueous analyte solutions. With L-cysteine, the tolerable limits for interferent ions were determined for Cr (VI), Se4+, Te4+, Pb2+, Cu2+, Ni+2, Co2+, Zn2+, Fe3+, As3+, Sb3+,Pd2+, Au3+, Bi3+, and Pt2+. The proposed method was used for the determination of germanium in seven geological references samples, with analytical results in good agreement with the certified values. The limit of detection of the method was 0.38 mug/L (equivalent to 0.01 mug/g in solid samples, assuming a sample weight of 0.5 g), and the relative standard deviation for the sample analysis ranged from 1.4% to 7.3%. The method can be used for the analysis of geological samples for germanium with concentrations ranging from 0.01 mug/g to 100 mug/g. [References: 21]