硫脲介质-火焰原子吸收光谱法连续测定多金属矿石中的银镉

Thiourea media-fire atomic absorption spectrometry for continuous determination of Ag and Cd in polymetallic ores

摘要: 传统火焰原子吸收光谱法测定Ag、Cd，样品需单独处理,耗时且成本高。建立了火焰原子吸收光谱法连续测定多金属矿石中银、镉的方法,样品经盐酸、硝酸（氟化氢铵）分解，盐酸提取可溶性盐，在硫脲介质中火焰原子吸收光谱仪连续测定Ag、Cd。方法检出限分别为Ag 0.005 4 μg/mL、Cd 0.003 2 μg/mL，Ag、Cd测定结果的相对标准偏差分别为0.7 %～2.8 %、0.4 %～2.4 %，加入标准物质回收率分别为97.5 %～103.6 %、96.4 %～104.0 %。该方法酸的用量少，环境污染程度低，准确度和精密度良好。

Abstract: Conventional FAAS takes much time and cost to determine Ag and Cd in ores because the samples need to be processed alone.In light of that,a continuous determination of Ag and Cd in polymetallic ores by FAAS is developed.The samples are dissolved by hydrochloric acid,nitric acid(ammonium bifluoride) and dissolvable salts are extracted with hydrochloric acid.And then,Ag and Cd are continuously determined by FAAS in thiourea media.The detection limits of the method are 0.005 4 μg/mL for Ag and 0.003 2 μg/mL for Cd.The RSD is 0.7 %-2.8 % for Ag and 0.4 %-2.4 % for Cd.The recovery rate of reference material is 97.5 %-103.6 % and 96.4 %-104.0 % respectively.The method consumes less acids,contains environment pollution and has good accuracy and precision.