717型阴离子交换树脂分离富集-光度法测定铜精矿和尾矿中微量钼

摘要

研究了717型阴离子交换树脂柱分离-富集钼的条件,建立了光度法测定铜精矿和尾矿中微量钼的方法.在pH为7.5的条件下,钼以MoO422形式被717型阴离子交换树脂定量吸附后,采用2 mol/L HNO3和0.5 mol/L NH4 NO3混合溶液定量洗脱,消除了绝大部分共存离子的干扰.通过树脂柱分离-富集后,用硫氰酸钾分光光度法测定钼的检出限为5.6 μg/L,相对标准偏差(RSD)为2.2％(n=5),加标回收率在96.2 ％～105.7％之间,实际样品测定结果与ICP-AES方法测定值基本一致.%In this paper, the conditions of separation and enrichment of trace amounts of molybdenum with 717 type anion exchange resin column have been studied. A method of spectrophotometric determination of molybdenum in copper concentrates and tailings is proposed. At pH 7. 5, molybdenum in MoO42- was separated and enriched by the ion exchange resin, then eluted by 2 mol/L HNO3 +0. 5 mol/L NH4NO3 mixture solution, which eliminated most of the interference from coexisting ions. The detection limit of the method was 5. 6 μg/L. The method was successfully used to determine trace a-mounts of molybdenum in real samples with RSD of 2. 2 % and the recovery between 96. 2 % and 105.7 %. The results obtained by this method are in good agreement with those obtained by ICP-AES.