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Updated: Jun 20, 2026

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
Published on: July 1, 2016
Development of a coprecipitation system for the speciation/preconcentration of chromium in tap waters
Aslihan Karatepe1, Esra Korkmaz, Mustafa Soylak
1Nevşehir University, Faculty of Science and Arts, Department of Chemistry, 50000 Nevsehir, Turkey. karatepea@gmail.com
Abstract:
A method for the speciation of chromium(III), chromium(VI) and determination of total chromium based on coprecipitation of chromium(III) with dysprosium hydroxide has been investigated and applied to tap water samples. Chromium(III) was quantitatively recovered by the presented method, while the recovery values for chromium(VI) was below 10%. The influences of analytical parameters including amount of dysprosium(III), pH, centrifugation speed and sample volume for the quantitative precipitation were examined. No interferic effects were observed from alkali, earth alkali and some transition metals for the analyte ions. The detection limits (k=3, N=15) were 0.65 microg/L for chromium(III) and 0.78 microg/L for chromium(VI). The validation of the presented method was checked by the analysis of certified reference materials.
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