Z-2000偏振塞曼石墨炉原子吸收光谱仪测定地质样品中的微量金

Determination of trace gold in geological samples by Z-2000 polarized Zeeman graphite furnace atomic absorption spectrometry

采用试样经灼烧,王水分解样品,聚氨脂泡沫塑料富集,硫脲解脱,Z-2000偏振塞曼石墨炉原子吸收光谱仪测定微量金。对于石墨管的选择、干燥、原子化、灰化、净化温度和时间进行了讨论,以及影响金的解脱效率因素,与发射光谱法对比等条件的研究。该方法的检出限为0.17ng·g-1,精密度低于8.0%,经国家一级分析标准样品验证,结果与标准值相符。

Trace gold was determined by means of atomic absorption spectrometer with Z-2000 polarized Zee- man graphite furnace after the samples have been burned, dissolved by aqua regia, collected by polyurethane foam materials and desorbed by thiourea. The choice of graphite tube, drying, atomization, gray, and purification of tem- perature and time were discussed, as well as the factors that affected the efficiency of gold＇s release and the condi- tions that was compared with emission spectroscopy mothod were studied . The detecting limit of which was O.17ng / g, the precision was less than 8.0%.This method has been verified by the analysis of the nationa standard samples ,and the results were in line with the standard value.