封闭溶样氢醌容量法测定焙烧矿样中的金

Determination of gold in roasted ore samples with sealed dissolution,quinhydrone volumedtric method

采用传统的王水分解溶样法处理焙烧矿样中的金,测定结果偏低。通过对焙烧矿样成分的研究,选用浓盐酸对焙烧矿样进行预处理,使Fe2O3等氧化物包裹的金暴露,再用硝酸-氯化钠-氟化氢铵-高锰酸钾溶样体系,于沸水浴中封闭溶解矿样,可使矿样分解完全。利用活性炭吸附柱动态吸附金,最后用氢醌标准溶液滴定金的含量。该方法简便、快捷,解决了金测定结果偏低的问题,其检出限为0.5×10-6,相对标准偏差为3.2%,是测定焙烧矿样中金的较好方法。

With traditional aqua regia decomposition of roasted ore samples, the measurement result is usually lower than the true one. Based on componential research on roasted ore sample, gold in oxide exposed with concentrated hydrochloric acid pretreatment. And then, in boiling water bath environment, the samples decomposed completely in nitric acid-sodium chloride-ammonium bifluorlde-potassium permanganate dissolution system. Gold was absorbed dynamically with active carbon column, and it was determined with quinhydrone standard solution. The result of the method is more exact. The detection limits of the method is 0.5×10^-6 and the relative standard deviations is 3.2%.