王水提取-原子荧光光谱法同时测定煤炭中的砷和汞

Simultaneous determination of arsenic and mercury in coal by atomic fluorescence spectrometry with aqua regia extraction

利用王水水浴对煤炭样品进行前处理,结合原子荧光光谱分析技术同时测定了煤炭样品中的砷和汞含量。对提取剂种类、用量、时间等条件进行了优化。砷和汞的方法检出限可达1.35μg/kg和0.45μg/kg。对煤炭标准物质和实际样品进行6次平行测定,砷、汞的RSD分别小于3.8%和4.5%,回收率为93%~105%。结果表明,王水水浴法具有操作简单,对煤炭中砷、汞提取回收率高的优点,结合原子荧光光谱能够满足实际开采和研究过程中对煤炭中砷和汞的同时快速测定要求。

Aqua regia in water bath was used in extracting arsenic(As)and mercury(Hg)in coal,combined with atomic fluorescence spectrometry,the contents of As and Hg were simultaneous determined.The experimental conditions including the type,dosage,and extraction time of the extractant were optimized.The detection limits of arsenic and mercury were 1.35μg/kg and 0.45μg/kg.Six parallel determinations and recovery experiments were conducted on coal reference materials and actual coal samples.The relative standard deviations were less than 3.8%in reference materials and less than 4.5%in actual samples,the recovery rates of As and Hg ranging in 93%-105%.The results showed that extraction of As and Hg in the coal samples by aqua regia water bath was with the advantages of simple work and high extraction efficiency.Combined with atomic fluorescence spectrometry,the requirement of rapid and simultaneous determination of As and Hg in coal can be satisfied.