异形电极光谱法测定化探样品中砷锑铋等25种元素

Spectrographic Determination of 25 Elements in Geochemical Samples Using a Specially Shaped Electrode

研究了用加罩电极作下电极,室电极作对电极测定As、Ba、Be、Bi、Cd等25个元素的光谱分析方法。以正交设计选择适宜的缓冲剂,考查了各元素的蒸发行为。用两台摄谱仪同时摄谱提高了分析速度,测定下限和精密度满足化探分析的要求。

A capped cell electrode is devised for the spectrographic determination of As Ba Be Bi Cd Co Cr Cu In La Mn Mo Nb Ni Pb Sb Sc Sn Sr Ti Tl V Y Yb and Zr. Experimental orthogonal method is used to select the buffer which is composed of NH4I, S, Na2SO4, ZnO, SiO2 and graphite powder. The detection limits of the volatile elements are lowered significantly. Combined with the usual arc concentration technigue, 25 elements can be measured simultaneously. The RSD are 3-11%. The detection limit, precision and accuracy meet the require -ments of regional geochemical survey.