Issue 13, 2014

Spectrophotometric flow-injection determination of sulfate in rainwater

Abstract

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.

Graphical abstract: Spectrophotometric flow-injection determination of sulfate in rainwater

Article information

Article type
Technical Note
Submitted
25 Feb 2014
Accepted
17 Mrz 2014
First published
15 Mai 2014

Anal. Methods, 2014,6, 4889-4894

Spectrophotometric flow-injection determination of sulfate in rainwater

T. F. Gomes, M. K. Sasaki, C. R. Silva and E. A. G. Zagatto, Anal. Methods, 2014, 6, 4889 DOI: 10.1039/C4AY00473F

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