聚四氟乙烯罐消解-HG-AFS法测定煤中砷

聚四氟乙烯

聚四氟乙烯罐消解-HG-AFS法测定煤中砷
刘瑞卿 杨建丽 肖勇中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001

摘　要:建立了一个新的测定煤中砷含量的方法，其消解过程在自制聚四氟乙烯消解罐一烘箱中完成．对煤样的消解条件（温度、时间及试剂等）、氢化发生的条件（硼氢化钾浓度、酸性介质的种类与浓度）及煤本体中其他元素的干扰进行了详实的考察，确定了最佳分析条件．用标准参考煤样（GBw11116）中砷含量对该方法进行了验证，本方法的测定值为33．30μg／g，而标准参考值为（34±2）μg／g，结果十分一致．用本方法也测定了5种煤中砷含量，相对标准偏差均小于5％．此方法可靠，定量准确，经济性好，利于推广应用．[著者文摘]

关键词:消解 氢化物发生一原子荧光光谱法 煤 砷
分类号:　TQ531[著者标引]文献标识码：文章编号：栏目信息：研究与开发
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DETERMINATION OF ARSENIC IN COAL BY DIGESTION AND HYDRIDE GENERATION-AFSLiu Ruiqing Yang Jianli and Xiao Yong State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, 030001 Taiyuan, ShanxiAbstract:A method for the determination of arsenic （As） in coal by the proeess of diges- tion and HG（hydride generation）-AFS （atomic fluorescence spectrometry） was presented in this paper. A home-made sealed Teflon container and an oven were used in the digestion process. The effects of the digestion conditions, including the digesting temperature, time and digesting agent, were discussed. The effects of hydrogenation conditions and interferences of other elements in coals, including the concentration of KBH4 and acid used, were also investigated. Optimum anal- ysis conditions were ascertained. The method was validated by analysis of As content in standard reference coal （GBWllll6） with satisfactory result and was successfully applied to the determi- nation of As content in five coals with RSD〈5%. The method is simple and precise and may be popularized.[著者文摘]

Key words:digestion, HG-AFS, coal, arsenic