Modification of the Method for Determination of Total Mercury in Coal by Oxygen Flask Combustion
摘 要
在氧瓶中采用镍铬电炉丝加热燃烧煤样,燃烧过程中形成的汞蒸气被酸性高锰酸钾溶液吸收并氧化成汞离子,经还原后用流动注射-氢化物发生冷原子吸收法测定.方法的相对标准偏差4.8%,相关系数0.999 7,回收率在91.4%~97.3%间,此方法特别适用于批量样品常规分析.
Abstract
Modification of the method for determination of total mercury in coal by oxygen flask combustion was proposed. Coal sample was burned in a crucible heated electrically by nichrome wire in an oxygen flask. Mercury vapour evolved was absorbed in a solution of potassium permanganate in sulfuric acid (1+9). The divalent mercury ion in the solution after reduction of permanganate with hydroxylamine hydrochloride solution was ready for determination of its content by FI-HG-AAS (cold vapour). Linearity between the absorbance and concentration of mercury (expressed as μg·L-1) was obtained with a correlation coefficient of 0.999 7. In analyzing 10 portions of the same sample by the method proposed,average value of mercury content found was 0.558 μg·L-1 with RSD (n=10) of 4.8%. Test for recovery was made by addition of standard mercury solutions of 3 different concentrations to a same coal sample,and results obtained were in the range of 91.4%-97.3%. It was proved that this method is feasible for the routine analysis of large number of samples.
中图分类号 O657.31
所属栏目 工作简报
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收稿日期 2006/1/24
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备注申世刚(1968-),男,河北省阜城县人,教授,从事原子吸收光谱研究和动力学研究.
引用该论文: SHEN Shi-gang,XIE Ming-shu,CHAO Chun-yan,LIANG Shu-xuan. Modification of the Method for Determination of Total Mercury in Coal by Oxygen Flask Combustion[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2007, 43(1): 51~53
申世刚,谢明树,晁春艳,梁淑轩. 氧瓶燃烧法测定煤中痕量汞的改进[J]. 理化检验-化学分册, 2007, 43(1): 51~53
被引情况:
【1】王晶,冯爽,胡德新, "氧弹燃烧-离子色谱法同时测定煤中氟、氯含量",理化检验-化学分册 50, 1464-1465(2014)
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参考文献
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【2】王定勇,石孝均,樊建.增压溶样-冷原子荧光法测定煤样中的汞[J].中国环境监测,1996,12(4):20-22.
【3】冯新斌,洪业汤.密闭溶样两次金汞齐冷原子吸收光谱法测定煤中微量汞[J].分析测试学报,1998,17(2):41-43.
【4】孙汉文.原子吸收光谱分析技术[M].北京:中国科学技术出版社,1992:306-307.
【5】鲁道夫·博克著.分析化学中试样分解方法手册[M].吴湘澍,王信予译.北京:中国标准出版社,1987:169-174.
【6】谢建鹰.氧瓶燃烧-冷原子吸收法测煤样中痕量汞[J].理化检验-化学分册,1997,33(5):18-19.
【7】徐斌.氧瓶技术的改进[J].湖北师院学报:自然科学版,1985,2:73-77.
【8】ASTM D3684-94Standard test method for total mercury in coal by the oxygen bomb combustion/atomic absorption method[S].
【9】中心实验室沥青组.在氧瓶测硫法中用镍铬丝代替铂丝的试验[J].石油地质实验,1966,3:56-57.
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