地质普查找金时,往往需要分析银(10~(-2)ppm),而铁矿单矿物含银量更微,且取样少(几十毫克)。采用无火焰原子吸收法,其分析灵敏度能满足化探分析的要求。用火焰原子吸收法,即使辅以萃取的办法,也难于达到10~(-2)ppm级灵敏度的要求。地矿部的称之为加罩对电极光谱法测定痕量银,灵敏度能满足要求,但电极系统较为复杂;在苏联,把试样用有机试剂萃取,装入阳极空穴中,银的检出限为0.01 Geological census to find gold, often need to analyze silver (10 -2 ppm), while the iron ore single mineral silver content is smaller, and sampling less (dozens of mg). Flameless atomic absorption spectrometry, its analytical sensitivity to meet the requirements of chemical analysis. Flame atomic absorption method, even if supplemented by the extraction method, it is difficult to achieve 10 -2 ppm level sensitivity requirements. The Ministry of Geology and Mineral Resources called it a hood-on-electrode spectrometric method for the determination of trace silver. The sensitivity can meet the requirements, but the electrode system is more complex. In the Soviet Union, samples were extracted with organic reagents and loaded into anode cavities. The limit is 0.01