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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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On-line preconcentration of chromium(III) and speciation of chromium in waters by flame atomic absorption spectrometry

Pasullean, Benyamin and Davidson, Christine M. and Littlejohn, David (1995) On-line preconcentration of chromium(III) and speciation of chromium in waters by flame atomic absorption spectrometry. Journal of Analytical Atomic Spectrometry, 10 (3). pp. 241-246. ISSN 0267-9477

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Abstract

The chemistry of complexation has been investigated and conditions optimized for on-line preconcentration of Cr-III by resins with immobilized quinolin-8-ol or iminodiacetate functional groups. When solutions were buffered to 0.1 mol l(-1) acetate at pH 9, the detection limit of Cr-III was 6 ng ml(-1) for preconcentration on the quinolin-8-ol resin at 6 ml min(-1) for 3 min. With the iminodiacetate resin (Muromac A-1), the optimum buffer conditions were 0.1 mol l(-1) acetate at pH 4, which gave a Cr-III detection limit of 2 ng ml(-1) (3 min preconcentration at 6 ml min(-1)). The major ions in sea-water did not interfere with preconcentration of 100 ng ml(-1) Cr-III by Muromac A-1. However, suppressive interferences were caused by 100 mu g ml(-1) of Ca2+ or Fe2+ with the quinolin-8-ol resin. Despite having similar log stability constants of complexation with either resin, the interference caused by Ca2+ was much greater than that by Mg2+. Muromac A-1 was used for preconcentration of Cr-III in estuarine- and sea-waters, prior to determination by flame atomic absorption spectrometry (FAAS). By reduction of Cr-VI to Cr-III, it was also possible to determine the total concentration of ionic Cr in the waters, which allowed calculation of the Cr-VI concentration by difference. The Cr-III concentration in the samples from the Clyde estuary were 3-8 ng ml(-1), with the Cr-VI concentration about 0.7 ng ml(-1). Only Cr-III (3 ng ml(-1)) was found in the sea-water samples from the Cumbrian Coast.