铜精矿中微量银的测定常用试金法和原子吸收法,因其它方法的误差均较大。微量银的光度法测定常用双硫腙和若丹宁(对二甲氨基苄叉若丹宁),对于精密测定不够理想。后来采用三元络合物测定银的方法研究较多。我们采用曙红-邻二氮菲水溶液光度法,改变了加试剂的次序,先加曙红,再加二氮菲,选择了最适 pH 值, Determination of trace silver in copper concentrate commonly used assay method and atomic absorption method, due to the error of other methods are larger. Spectrophotometric determination of trace silver commonly used dithizone and ifdannine (p-dimethylazylidene rhodanine), less than ideal for precision measurements. Later use ternary complex determination of silver research methods. We use eosin - phenanthroline aqueous solution photometry, changing the order of reagents, first plus eosin, plus phenanthroline, select the optimum pH,