717型阴离子交换树脂分离富集 光度法测定

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MoO４２ 形式被717型阴离子交换树脂定量吸附后，采用2 mol/L HNO3和0.5 mol/L NH4NO3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。

Spectrophotometric determination of trace amounts of molybdenum in copper concentrates and tailings after separation and enrichment by 717 type anion ion exchange resins

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 amounts 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.