DMA-80汞分析仪测定粗制氧化锌中的汞

建立了DMA-80型汞分析仪直接固体进样测定粗制氧化锌中汞的方法。试样经干燥和高温分解处理,采用催化分解和吸附净化使分解产物转变为氧化汞蒸气,通过金质汞齐化器还原并以金汞齐形式被捕集,最后在波长253.65nm处进行原子吸收测量,依据朗伯-比尔定律定量。优化了干燥时间和温度、分解时间和温度等实验条件,同时做了方法检出限、精密度、回收率等实验。结果表明:方法检出限为0.015ng,线性范围为0.02~100ng,相关性系数≥0.999,回收率为93.2%~102.7%,精密度(RSD,n=7)≤5.0%,可用于进口粗制氧化锌的快速检验。

Determination of mercury in crude zinc oxide by DMA-80 mercury analyzer

A method for the determination of mercury in crude zinc oxide by direct solid injection of DMA-80 mercury analyzer was established.The sample was dried and pyrolyzed,and the decomposition products were converted into oxidized mercury vapor by catalytic decomposition and adsorption purification,then reduced by the gold mercury singularity and captured in the form of gold amalgam,and finally the atomic absorption was measured at a wavelength of 253.65 nm,and quantified according to Lambert-Beer law.The experimental conditions such as drying time and temperature,decomposition time and temperature were optimized,and experiments such as detection limit,precision density and recovery rate were also carried out. Results showed that the detection limit of the method was 0.015 ng,the linear range was 0.02~100 ng,the correlation coefficient was≥0.999,the recovery rate was 93.2%~102.7%,and the precision（RSD,n=7）≤5.0%,which could be used for the rapid inspection of imported crude zinc oxide.