DETERMINATION OF SELENIUM IN FRESH-WATERS BY CATHODIC STRIPPING VOLTAMMETRY AFTER UV IRRADIATION

被引：52

作者：

MATTSSON, G ^{[1
]}

NYHOLM, L ^{[1
]}

OLIN, A ^{[1
]}

ORNEMARK, U ^{[1
]}

机构：

[1] UNIV UPPSALA,INST CHEM,DEPT ANALYT CHEM,S-75121 UPPSALA,SWEDEN

来源：

TALANTA | 1995年 / 42卷 / 06期

关键词：

D O I：

10.1016/0039-9140(95)01494-V

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An analytical method was developed for the determination of total dissolved selenium in fresh waters, using linear sweep cathodic stripping voltammetry (CSV) in combination with UV photolytic digestion. Both the CSV method, based on the electrodeposition and stripping of Cu2Se, and the UV irradiation procedure were investigated in detail. In the presence of dissolved organic substances, as in freshwaters, Se(VI) is reduced to Se(IV) by UV irradiation in 0.1M hydrochloric acid. Glucose can be used as the carbon source in samples low in natural dissolved organic carbon (DOC). The photolytic yields of Se(IV) were about 90% in both cases. Five freshwater samples were analysed For total selenium by CSV after UV photolysis, and by hydride generation atomic absorption spectrometry (HG-AAS) after oxidative digestion followed by reduction with hydrochloric acid. The results agreed well and the concentrations were in the range 70-190 ng/l., well above the detection limit of the CSV method at 2 ng/l.

引用

页码：817 / 825

页数：9

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