溶剂萃取石墨炉原子吸收光谱法连续测定地质样品中金、银、镓、铟

STUDY OF CONTINUOUS DETERMINATION OF An,Ag,In,Ga IN GEOLOGICAL SAMPLES BY SOLVENT EXTRACTIONANTIEXTRACTION-GFAAS

本文提出一个新的萃取反萃取体系，用石墨炉原子吸收光谱法连续测定地质样品中的Ａｎ、Ａｇ、Ｉｎ、Ｇａ四种元素，不但有效地抑制了共存元素的干扰，而且能提高测定灵敏度和精密度。文中讨论了不同石墨管对测定的影响及元素的原子化过程，较深入探讨镍对镓的基体改进作用和机理。样品分析结果与推荐值一致。

Extraction--antiextraction and continuous determination of An,Ag,In,Ga in geological samples by GFAAS were studied in this paper.Sensitivity and precision were increased.Interferences were depressed effectively.Infulence of uncoated and pyrocoated tubes on the determination of An,Ag,In,Ga was discussed.In addition, the effect and mechanism of Ni for use as matrix modification reagent of Ga were discussed.Determined values of An,Ag,In,Ga in geological samples by our established method are in good agreement with other methods or certified values. RSD of determination of An,Ag,In,Ga is 5.2%,5.1%,6.8% and 6.7%,respectively.Recovery ratio is between 93.5--109.5%.This method can be also used to determine other noble and rare dispersion metal in geological samples.