Determination of sulfate in natural and residual waters by turbidimetric flow-injection analysis

Inês P.A. Morais*, António O.S.S. Rangel, M. Renata S. Souto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A turbidimetric flow-injection system was developed for the determination of sulfate in natural and residual water samples, with no previous treatment, using spectrophotometric detection. The precipitating agent, 7.0% (w/v) barium chloride solution prepared in 0.10% (w/v) polyvinyl alcohol, was added by using the merging-zones approach. A 100 mg/L sulfate solution in 0.07M nitric acid was mixed with the sample before it entered the injection loop to improve the detection limit, provide in-line pH adjustment, and prevent the interference of some anionic species. The relative standard deviations of the results were between 1.4 and 3.0% and were in agreement with results obtained by the reference method. Samples within a linear concentration range of 10-120 mg SO2-4/L can be analyzed at a rate of 40/h. The detection limit is 5 mg SO2-4/L.

Original languageEnglish
Pages (from-to)59-64
Number of pages6
JournalJournal of AOAC International
Volume84
Issue number1
DOIs
Publication statusPublished - 1 Jan 2001

Fingerprint

Dive into the research topics of 'Determination of sulfate in natural and residual waters by turbidimetric flow-injection analysis'. Together they form a unique fingerprint.

Cite this