Inductively coupled plasma atomic emission spectrometric determination of tungsten and molybdenum in mineral processing samples with hydrogen peroxide and citric acid as complexing agent
WANG Tong-min, QI Bai-yu, WANG Ding
(1.The Physical and Chemical Testing Center & Northwest Research Institute
of Mining and Metallurgy,Baiyin 730900, China；
2.Environmental Protection Institute & Northwest Research Institute of Mining and Metallurgy, Baiyin 730900,China)
Abstract：The sample was dissolved in hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid, citric acid and hydrogen peroxide. W239.709 nm and Mo 284.823 nm were used as the analytical lines for tungsten and molybdenum, respectively. The contents of tungsten and molybdenum in sample were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The precipitation of tungsten acid and molybdenum acid was inhibited by the complexing action of citric acid and hydrogen peroxide to accelerate the dissolution of sample and guarantee the determination accuracy of tungsten and molybdenum. The detection limit was 0.015 μg/mL and 0.003 μg/mL, and the limit of quantitation was 0.075 μg/mL and 0.015 μg/mL for tungsten and molybdenum, respectively. When the content of tungsten and molybdenum was in range of 0.1-100 μg/mL, the calibration curve was linear, with correlation coefficient more than 0.9995. The determination results of tungsten and molybdenum in molybdenum ore standard sample and mineral processing samples by this method were consistent with the certified values or those obtained by thiocyanate spectrophotometry or gravimetric method. The recovery tests of tungsten ore standard sample and mineral processing samples were conducted. The found recoveries of tungsten and molybdenum were 96%-105% and 94%-102%, respectively.
王同敏，齐白羽*，王 丁 . 以柠檬酸和过氧化氢为络合剂电感耦合等离子体原子发射光谱法测定选矿样品中钨和钼[J]. 冶金分析, 2012, 32(8): 66-69.
WANG Tong-min, QI Bai-yu, WANG Ding. Inductively coupled plasma atomic emission spectrometric determination of tungsten and molybdenum in mineral processing samples with hydrogen peroxide and citric acid as complexing agent. , 2012, 32(8): 66-69.
