流动注射动力学分光光度法测定海水中痕量硒（IV）

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

作者信息

Zhengjun Gong, Xinshen Zhang, Guohe Chen, Xinfeng Xiao

机构信息

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.

出版信息

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

DOI:10.1016/j.talanta.2005.01.029

PMID:18970085

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.

摘要

本文提出了一种简单、准确、灵敏且具选择性的流动注射催化动力学分光光度法，用于快速测定痕量硒。该方法基于在酸性介质中，硒（IV）对乙二胺四乙酸二钠盐（EDTA）、硝酸钠与六水合硫酸亚铁铵反应的加速作用。在该反应溶液中于440nm处记录吸光度强度。校准曲线在5×10⁻⁹ - 2×10⁻⁷和2×10⁻⁷ - 2×10⁻⁶gml⁻¹范围内呈线性。检测限为2×10⁻⁹gml⁻¹。对于5×10⁻⁸gml⁻¹的硒（IV）（n = 11），相对标准偏差为3.4%；对于5×10⁻⁷gml⁻¹的硒（IV）（n = 11），相对标准偏差为2.7%。该方法非常简单、快速，适用于自动连续分析。所提出的体系已成功应用于海水样品中硒（IV）的测定。