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Determination of acid volatile sulphur in river sediments by ICP-OES coupled with purge and trap method

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The developed and tested method is based on the acid volatile sulphur (AVS) releasing from a sample of sediment by acidification with hydrochloric acid and sequential absorption of released hydrogen sulphide into the absorption solution of sodium hydroxide. Total sulphur absorbed in the absorption solution is subsequently determined by inductively coupled plasma optical emission spectrometry (ICP-OES) technique. The method was tested using both model and real samples of the river sediment. Obtained results were compared with the results of iodometric determination as the method routinely used for the AVS determination. In case of using ICP-OES with purge and trap, there is no spectral interference of calcium; therefore for the determination of sulphur, it is possible to use atomic emission line of sulphur S I 180.7 nm. The tested method provides the results comparable with the iodometric method within the range of tested concentrations. The detection limit (LOD) of this method is 0.09 mg· S2 L−1 in the absorption solution which corresponds to 0.23 mg S2 ·kg−1 in a sediment. Value of LOD is comparable with the iodometric determination.
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Keywords: AVS; ICP-OES; purge and trap; sediment toxicity

Document Type: Research Article

Affiliations: 1: Research Institute of Inorganic Chemistry, Ltd, ., 400 01, Ústí nad Labem, Česká Republika 2: Faculty of Science, Department of Chemistry, J. E. Purkinje University, 400 96, Ústí nad Labem, Česká Republika

Publication date: September 26, 2015

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