采用二乙氨基二硫代甲酸银光度法测定裂解气中的砷含量

Determination of arsenic content in pyrolysis by using silver diethyl dithiocarbamate spectrophotometric method

建立了裂解气中痕量砷(As)的二乙氨基二硫代甲酸银光度测定法。该方法适用于As质量浓度为mg/L级的裂解气的测定。在H2SO4加入量为20 mL,10～20目的锌粒加入量为6 g,吸光波长为530 nm的优化条件下,As含量测定结果的相对标准偏差小于10%,方法的回收率为95%～105%。

The determination of trace arsenic in prolysis gas by using silver diethyl dithiocarbamate spectrophotometric method was established. This method was applicable to determination of the mass concentration of arsenic in pyrolysis gas in the level of mg/L. The optimal operating conditions of the de- termination were as follows： the dosage of sulfuric acid was 20 mL, the dosage of the zinc particles in 10 -20 mesh was 6 g,the absorbtion wavelength was 530 nm. The relative standard deviation was less than 10% ,and the recovery rate was in the range of 95% - 105%.