流动注射_铅_富集_痕量分析_

在线浓缩柱富集光学检测流动注射联用测定海水中痕量铅

http://www.100md.com 《分析化学》 2006年第10期

流动注射,铅,富集,痕量分析,,流动注射，铅，富集,痕量分析,1引言,2实验部分,3结果与讨论,References

     摘要研究了流动注射二溴对甲偶氮磺分光光度法测定不同水中的铅。在1.2 mol/L HNO3中，经过富集后的Pb2+与二溴对甲偶氮磺形成络合物，该络合物在630 nm有最大吸收峰，且能稳定存在至少15 h。优化了反应的化学因素和流动注射系统反应条件。该方法的检出限和线性范围分别为0.1和0.5～500 μg/L，对含量为5 μg/L、2 μg/L铅(Ⅱ)标准溶液进行了11次平行测定, 其相对标准偏差分别为1.1%和2.5%。应用于自来水、河水、池塘水、海水中痕量铅(Ⅱ)的测定，结果令人满意。与其它测定铅的标准方法对比吻合很好。

    关键词流动注射，铅，富集,痕量分析

    Flow InjectionSpectrophotometric Determination of Trace Lead in Seawater by Preconcentration Method

    Zou Yuquan, Zhang Xinshen*, Li Hua, Tu Jie, Yuan Dong

    (Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education, Chengdu 610065)

    Abstract A simple, accurate, sensitive and selective flow injection (FI) system for the determination of Pb(Ⅱ) at trace level with a preconcentration step and spectrophotometric detection was proposed. It is based on the preconcentration of lead ions on precolum and dibromomethyl sulfonazolead complex formation in 1.2 mol/L nitric acid medium with sensitive absorption peak at 630 nm. The experimetnal conditions were optimized. The method provided a liner range between 0.5 to 500 μg /L, a detection limit of 0.1 μg /L and a sample throughout of 24 h. The relative standard deviation was 2.5% for 1.0μg /L, 1.1% for 5.0 μg /L, lead(Ⅱ) (n=11). The method has been applied to the determination of lead in natural , tap water and seawater samples. and the results of spiked samples are in good agreement with those of inductively coupled plasmaatomic emission spectrometry. ......

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