均匀优化设计-氢化物发生原子吸收光谱法测定钨精矿中砷量

On the Arsenic Amount Determination in Tungsten Concentrate by Optimal Design of Uniform-hydride Generation Atomic Absorption Spectrometry

该方法应用均匀设计这一优化试验设计理论,采用氢化物发生原子吸收光谱法测定钨精矿中砷量。经实验确定了测定砷量的最佳分析条件:经硫酸-硫酸铵分解,用柠檬酸在氨性介质中络合钨、铁、锰等干扰元素,用抗坏血酸预还原五价的砷到三价,样品溶液在15%的酸度中,经流动注射-氢化物发生与原子吸收光谱仪联用测定砷量。该方法具有灵敏度高,准确性好,快速简便,干扰元素少等优点。检出下限可到0.001%

A technology based on uniform design is proposed in the optimization of arsenic amount determination in tungsten concentrate by hydride generation atomic Absorption Spectrometry.The optimized analysis condition is obtained by means of experiments： the sample is decomposed by sulfuric acid-ammonium sulfate,coordinated with tungsten,iron,manganese in ammonia medium using citric acid,then reduced pentavalent arsenic to trivalent arsenic by ascorbic acid.Arsenic amount at the degree of 15 % acid solution is measured by the united equipments： flow injection-hydride generator-atomic absorption spectrophotometer.This technology has many advantages,such as high sensitivity,good accuracy,fast and simple,little elements interfering.The detection limit of arsenic amount can be 0.001 %.