Flow injection kinetic spectrophotometric determination of trace amounts of Se(IV) in seawater

Gong Zhengjun; Zhang Xinshen; Chen Guohe; Xiao Xinfeng

doi:10.1016/j.talanta.2005.01.029

Flow injection kinetic spectrophotometric determination of trace amounts of Se(IV) in seawater

Talanta. 2005 May 15;66(4):1012-7. doi: 10.1016/j.talanta.2005.01.029.

Authors

Gong Zhengjun¹, Zhang Xinshen, Chen Guohe, Xiao Xinfeng

Affiliation

¹ Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education, Sichuan 610065, Chengdu, PR China; School of Environmental Science and Engineering, Southwest Jiaotong University, Sichuan 610031, Chengdu, PR China.

PMID: 18970085
DOI: 10.1016/j.talanta.2005.01.029

Abstract

A simple, accurate, sensitive and selective flow injection catalytic kinetic spectrophotometric method for rapid determination of trace amounts of selenium is proposed in this paper. The proposed method is based on the accelerating effect of Se(IV) on the reaction of ethexlenediamine tetrecetic acid disodium salt (EDTA) and sodium nitrate with ammonium iron(II) sulfate hexahydrate in acidic media. The absorbance intensity was registered in this reaction solution at 440nm. The calibration graph is linear in the range of 5x10(-9)-2x10(-7) and 2x10(-7)-2x10(-6)gml(-1). The detection limit is 2x10(-9)gml(-1). The relative standard deviation was 3.4% for 5x10(-8)gml(-1) Se(IV) (n=11), 2.7% for 5x10(-7)gml(-1) Se(IV) (n=11). This method is very simple, rapid and suitable for automatic and continuous analysis. The presented system has been applied successfully to determination of Se(IV) of seawater samples.