火焰原子吸收光谱法测定杂铜中的银

Determination of silver in miscellaneous copper by flame atomic absorption spectrometry

先用硝酸溶解杂铜,再加入盐酸溶解并络合银,并使盐酸的酸度保持25%,最后用火焰原子吸收光谱法测定溶液中的银.通过对盐酸(1+3)对银的络合能力、基体和共存元素对杂铜中银测定的影响进行研究,结果表明:铜基体和共存元素对银的测定没有干扰.本法测定快速、准确,测定结果与火试金测定结果一致,相对标准偏差小于1.2%(n=7),回收率99.0%～99.6%.本法可用于杂铜含银10～15000g/t的测定.

Miscellaneous copper was dissolved first in nitric acid, and then hydrochloric acid was added to dissolve and complex silver, and HCl acidity remains at 25%. Silver in solution was determined by flame atomic absorption spectrometry. An investigation was made by examining hydrochloric acid（1 ＋3） eomplexing ability of silver,and the effects of copper matrix and coexisting elements on the determination of silver. The results showed that the copper substrate and other coexisting elements didn＇t make any sense on the determination of silver. This method is simple, and the accuracy is high. The determination results were in good agreement with those obtained by fire assaying. The RSD was less than 1.2% （n= 7）, and the recovery ratio is 99.0%-99. 6 %. The method can be easily used for the determination of miscellaneous copper containing silver about 10-15000g/t.