Determination of dissolved selenium(VI) in freshwater |
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Authors: | Ornemark U Olin A |
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Affiliation: | Uppsala University, Department of Analytical Chemistry, P.O. Box 531, S-751 21 Uppsala, Sweden. |
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Abstract: | A procedure is proposed for the determination of selenate in freshwaters with a high content of dissolved organic material. After passage through an XAD-8 column, selenate is collected on a strong anion exchanger and subsequently eluted with hydrochloric acid. Following conversion into the tetravalent state, selenium is determined using atomic absorption spectrometry after hydride generation and preconcentration in a cold trap system. The two-column procedure effectively separates selenium(VI) from possible organic interferents and allows quantification at the low ng/l. level. Results from the investigation of waters from lakes and streams indicate that selenium(IV) and (VI) may constitute a very small part of total dissolved selenium. |
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