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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | León, Claudia A. Ponce de Caruso, Joseph A. Bayón, Maria Montes DeNicola, Katie |
| Copyright Year | 2003 |
| Abstract | Different techniques have been employed in order to evaluate the most efficient procedure for the extraction of selenium from soil as required for speciation. Selenium contaminated sediments from Stewart Lake Wetland, California were used. A strong acid mineralization of the samples gives quantitative total selenium, which is then used to estimate recoveries for the milder extraction methods. The different extraction methodologies involve the sequential use of water, buffer (phosphate, pH 7) and either acid solution (e.g. HNO3 or HCl) or basic solutions (e.g. ammonium acetate, NaOH or TMAH). Pyrophosphate extraction was also evaluated and showed that selenium was not associated with humic acids. The extractants were subsequently analyzed by size exclusion chromatography (SEC) with UV (254 and 400 nm) and on-line ICP-MS detection; anion exchange chromatography, and ion-pair reversed phase chromatography with ICP-MS detection. For sequential extractions the extraction efficiencies showed that the basic extractions were more efficient than the acidic. The difference between the acidic and the basic extraction efficiency is carried to the sulfite extraction, suggesting that whatever is not extracted by the acid is subsequently extracted by the sulfite. The species identified with the different chromatographies were selenate, selenite, elemental selenium and some organic selenium. |
| Starting Page | 435 |
| Ending Page | 440 |
| Page Count | 6 |
| File Format | HTM / HTML PDF |
| ISSN | 14640325 |
| Volume Number | 5 |
| Issue Number | 3 |
| Journal | Journal of Environmental Monitoring |
| DOI | 10.1039/b301108a |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | SEC Stewart Lake Wetland California Selenium Acid Phosphate Nitric acid Hydrochloric acid Ammonium Pyrophosphate Humic acid Size-exclusion chromatography U.S. Securities and Exchange Commission Anion-exchange chromatography Chromatography Sulfite Selenate |
| Content Type | Text |
| Resource Type | Article |
| Subject | Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law |
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