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《Chinese Journal of Analytical Chemistry》 2006-10
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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)  
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.
【Fund】: 国家高技术研究发展规划(863)项目(No.2002AA639290)
【CateGory Index】: X834;O657.3
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