用钨丝绕成笼状多层圆盘电极,用此电极对水中痕量银进行电解富集,再放入石墨杯中进行原子吸收测定。富集底液选用1.6mol·1~(-1)H_2SO_4,测定线性范围为0.01～0.5ng·ml~(-1),在含银为0.1ng·ml~(-1)的溶液中10次富集测定值的变动系数为4.2%,检出下限为0.005ng·ml~(-1)。三十多种共存离子不干扰测定。对实际水样进行测定并做回收率试验,获得满意的结果。 Covered with tungsten wire into a cage-like multi-layer disk electrode, with the electrode of trace silver in water electrolysis enrichment, and then placed in a graphite cup for atomic absorption determination. The concentration of 1.6mol · 1 -1 H_2SO_4 was used as the substrate for the enrichment, the linear range was 0.01 ~ 0.5ng · ml -1, and the concentration was 0.1ng · ml -1 The coefficient of variation of the enrichment determination was 4.2%, and the lower limit of detection was 0.005 ng · ml -1. More than thirty kinds of coexisting ions do not interfere with the determination. The actual water samples were measured and the recovery test, to obtain satisfactory results.