Ion chromatographic determination of perchlorate in foods by on-line enrichment and suppressed conductivity detection
| Autor: | David A. Nortrup, and Alexander J. Krynitsky, Richard A. Niemann |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Detection limit
Chromatography Hot Temperature Perchlorates Ion exchange Chemistry Extraction (chemistry) Ion chromatography Infant Fraction (chemistry) General Chemistry Lettuce Chromatography Ion Exchange Daucus carota Perchlorate chemistry.chemical_compound Nitric acid Cucumis melo Fruit Humans Infant Food Thyroid function General Agricultural and Biological Sciences Food Analysis |
| Zdroj: | Journal of agricultural and food chemistry. 54(4) |
| ISSN: | 0021-8561 |
| Popis: | Systemic uptake of perchlorate anion, a rocket fuel component and potential thyroid function disruptor, by leafy vegetables and other crops grown in contaminated waters is a public health concern. A column-switching anion-exchange chromatographic method with suppressed conductivity detection, described in this paper, achieved a 3-6 microg/kg method limit of quantitation in analysis of the wet weight edible portion of cantaloupe, carrots, lettuce, and spinach samples with field-incurred perchlorate. A test portion was blended with dilute nitric acid, and the extract was filtered under vacuum. A portion of the measured filtrate was acidified to pH approximately 2 by addition of cation-exchange resin, 4 mL was passed through a graphitized carbon cleanup column, and an aliquot of a collected fraction was pushed through a short precolumn for anion extraction, enrichment, and injection onto the analytical column. Statistical comparison with determination by tandem mass spectrometry-ion chromatography analysis of untreated filtrate revealed that the difference between means was not significant at the 95% confidence level (P valueor = 0.12) for crops tested. In addition, the method was applied to cooked vegetables processed as baby food. |
| Databáze: | OpenAIRE |
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