醋酸纤维富集-ICP-AES测定高品位氰化液体中金、银含量

由于氰化液体的特殊性，常用的分析方法都不能获得理想的回收率，方法的精密度不高，影响了对工艺指标的控制，并且碱性氰化液体会对仪器造成很大程度的腐蚀，降低仪器的使用寿命及稳定性，增加了工作成本。通过将高品位氰化液体酸化，在一定浓度的王水介质中，用经有机溶剂浸泡过的醋酸纤维吸附富集溶液中的金、银，再用20 g/L的硫脲溶液在水浴加热条件下解吸，采用ICP-AES测定硫脲介质下的金、银，金、银的回收率为98.5%～100.5%，方法的检出限金为0.0021，银为0.0030。

Analysis on the Content of Gold and Silver in High-grade Cyanide Liquid by Acetate Fiber Concentration-ICP-AES Method

Because of the particularity of the cyanide liquid,the frequently-used analysis methods can’t achieve an ideal recovery rate of gold and silver.The lower analysis precision of the methods affected the controlling of the process indicators.At the same time,Alkaline cyanide liquid caused a severe corrosion for the instrument, which reduced the equipment life and stability and increased the operating costs.By acidified the high-grade liquid cyanide,using acetate fiber which soaked by organic solvents enriched gold and silver in the solution at the media of a certain concentration aqua regia,and then desorbed them using 20 g/L of thiourea solution in a water bath heating.Finally,the recovery rate of the gold and silver were analyzed by ICP-AES in thiourea solutions which achieved 98.5%~100.5%.The detection limit of the method is 0.0021 for gold and 0.0030 for silver.