催化光度法测定水中痕量汞
Catalytic Photometric Determination of Trace Amounts of Mercury in Water
摘 要
痕量汞的存在对在稀硝酸介质中亚铁氰化钾及1,10-二氮菲之间的反应有明显的催化作用,在508 nm波长处测定催化体系及非催化体系的吸光度A及A0并计算其吸光度差ΔA,该体系的ΔA与相应汞的质量浓度从2.0×10-3~6.4×10-2mg·L-1之间呈线性关系(r=0.987 6),其摩尔吸光率为5.92×105L·mol-1·cm-1.对一件水样按此方法测定其汞含量,测得结果的RSD(n=6)值为0.134%.按标准加入法进行了回收率试验,所得结果在97.5%~102.7%之间.
标准加入法
汞(Ⅱ)
水样
Catalytic potometry
Standard addition
Mercury
Water sample
Abstract
It was found that the reaction between potassium ferrocyanide and 1,10-phenanthroline was catalyzed by Hg(Ⅱ) ion in dil.HNO3 solution.Absorbance values of the catalyzed (A) and non-catalyzed (A0) reaction systems were taken at the wavelength 508 nm.Linear relationship between values of ΔA(A-A0) and concn.of Hg(Ⅱ) added to the reaction system was found in the range from 2.0×10-3 to 6.4×10-2mg·L-1 (r=0.987 6) with a molar absorptivity (ε508) of 5.92×105L·mol-1·cm-1.The proposed method was applied to the determination of mercury in a water sample and the value of RSD (n=6) calculated from the analytical results was 0.134%,values of recovery obtained in the recovery test were in the range of 97.5%-102.7%.
中图分类号 O657.31
所属栏目 工作简报
基金项目
收稿日期 2006/6/16
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备注刘永和(1955-),男,湖南邵阳人,高级工程师,从事分析化学教学和生物传感科学研究.
引用该论文: LIU Yong-he. Catalytic Photometric Determination of Trace Amounts of Mercury in Water[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2007, 43(10): 830～832
刘永和. 催化光度法测定水中痕量汞[J]. 理化检验－化学分册, 2007, 43(10): 830～832
被引情况:
【1】刘永和,刘南辉,黄海燕, "胶束增敏催化分光光度法测定水中痕量铜",理化检验－化学分册 46, 1075-1077(2010)
【2】付海曦,刘威,张春辉,李艳, "水体中重金属离子的检测方法研究进展",理化检验－化学分册 48, 496-503(2012)
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参考文献
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【3】张毅,汪明礼.铁(Ⅱ)-吐温80胶束催化动力学光度法测定天然水中痕量汞[J].仪器仪表与分析监测,2002(4):34-35．
【4】何荣桓,王建华.催化光度法测定环境样品中微量Hg的研究[J].环境科学,1998,19(1):80-82．
【5】奚旦立,刘秀英,郭安然.环境监测[M].北京:高等教育出版社,1989:40．
【6】刘伟民,陈青,徐金华.催化动力学-流动注射停留分光光度法测定微量汞的研究[J].分析试验室,2001,20(3):73-75．
【7】张爱梅.动力学光度法测定污水中痕量汞[J].分析化学,1998,26(10):1222-1227．
【8】刘长增,刘晓泓.配体交换反应催化动力学光度法测定痕量汞[J].分析化学,2004,32(9):1272-1272．
【9】刘长增,王淑仁.污水中痕量汞的动力学分光光度法测定[J].分析化学,1990,18(4):348-351．
【10】王建华,吕菊波.测定痕量汞的新催化动力学分光光度法研究[J].分析化学,1996,24:717．
【11】Phull M.Trace element determination in environmental pollution: A kinetic method for mercury estimation[J].Talanta,1981,28:610．
【12】Tabata M.A kinetic method for the determination of a nanogram amount of mercury(Ⅱ) by its catalytic effect on the complex formation reaction of manganese(Ⅱ) with α,β,γ,δ-tetraphenylporphinesulfonate[J].Anal Lett,1980,13:427．
【13】刘珍.化验员读本[M].北京:化学工业出版社,1988:370．
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