Spectrophotometric flow-injection determination of sulfate in rainwater

被引：3

作者：

Gomes, Taciana F. ^{[1
]}

Sasaki, Milton K. ^{[1
]}

Silva, Claudineia R. ^{[1
]}

Zagatto, Elias A. G. ^{[1
]}

机构：

[1] Univ Sao Paulo, NAPTISA Ctr Nucl Energy Agr, BR-13400970 Piracicaba, SP, Brazil

来源：

ANALYTICAL METHODS | 2014年 / 6卷 / 13期

基金：

巴西圣保罗研究基金会;

关键词：

TURBIDIMETRIC DETERMINATION; WATER SAMPLES; MOLECULAR ASSOCIATION; DIMETHYL-SULFOXIDE; NATURAL-WATERS; PLANT DIGESTS; ION; DYNAMICS; REACTOR; CORE;

D O I：

10.1039/c4ay00473f

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A flow-injection system is proposed for the spectrophotometric determination of low concentrations of sulfate in rainwater using barium dimethylsulfonazo(III) (Ba-DMSA). Selectivity is enhanced by including a Dowex 1-X8 anionic resin mini-column into the manifold, aiming at sulfate in-line concentration and separation from potential interfering chemical species. The proposed system is robust and provides precise results (r.s.d. < 5.0%) at an analytical frequency of 40 h(-1). About 0.09 mg DMSA is consumed per determination. The analytical curve is linear up to 2.0 mg L-1 SO42- and the detection and quantification limits were estimated as 0.01 and 0.04 mg L-1 SO42-, respectively. Results are in agreement with those obtained by ion chromatography at the 95% confidence level.

引用

页码：4889 / 4894

页数：6

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