| Extraction of fipronil and thiobencarb from anaerobic water samples using solid-phase extraction. | |
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MedLine Citation:
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PMID: 16001862 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Anaerobic water samples containing levels of soluble Fe(II) may form insoluble Fe(III) particulates that could hinder subsequent extraction and analysis. Solid-phase extraction (SPE) cartridges could become blocked by this material, reducing the volume that can be processed. The ability of ascorbic acid to reduce these Fe(III) colloids and/or to prevent further oxidation of Fe(II) by dissolved oxygen during sampling was investigated and compared to sample stabilization with hydrochloric acid. Ascorbic acid (5%, w/v) proved the most effective treatment because it prevented 95% of the dissolved iron in the sample from precipitating during processing, compared to 40% in untreated samples. The effect of ascorbic acid addition on degradation of 2 rice pesticides, fipronil and thiobencarb, was investigated and compared to degradation rates in water. Pesticide reduction by ascorbic acid over a 3 h period was insignificant compared to the natural degradation occurring in deionized water. While this method was shown to increase sample processing time, it also allowed the processing of large-volume anaerobic water samples (150 mL) that were previously not extractable due to rapid obstruction of the SPE cartridge. |
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Authors:
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Gregory Doran; Stuart Helliwell; Philip Eberbach |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of AOAC International Volume: 88 ISSN: 1060-3271 ISO Abbreviation: J AOAC Int Publication Date: 2005 May-Jun |
Date Detail:
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Created Date: 2005-07-08 Completed Date: 2005-09-19 Revised Date: 2008-03-17 |
Medline Journal Info:
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Nlm Unique ID: 9215446 Medline TA: J AOAC Int Country: United States |
Other Details:
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Languages: eng Pagination: 854-9 Citation Subset: IM |
Affiliation:
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CRC for Sustainable Rice Production, Farrer Centre, School of Agriculture, Charles Sturt University, Wagga Wagga 2678, NSW, Australia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Ascorbic Acid
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analysis Chromatography, Gas Colloids Dose-Response Relationship, Drug Herbicides / analysis Hydrochloric Acid / analysis, chemistry Insecticides / analysis Iron / analysis Oxygen / analysis, chemistry Pesticide Residues / analysis Pesticides / analysis Pyrazoles / analysis* Thiocarbamates / analysis* Time Factors Water / analysis* Water Pollutants, Chemical* |
| Chemical | |
Reg. No./Substance:
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0/Colloids; 0/Herbicides; 0/Insecticides; 0/Pesticide Residues; 0/Pesticides; 0/Pyrazoles; 0/Thiocarbamates; 0/Water Pollutants, Chemical; 120068-37-3/fipronil; 28249-77-6/benthiocarb; 50-81-7/Ascorbic Acid; 7439-89-6/Iron; 7647-01-0/Hydrochloric Acid; 7732-18-5/Water; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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