| Abstract: | Analysis of p,p‘-DDT in environmental samples requires monitoring the GC-derived breakdown of this insecticide, which produces p,p‘-DDD and/or p,p‘-DDE, both also primary environmental degradation products. A performance evaluation standard (PES) containing p,p‘-DDT but not p,p‘-DDD or p,p‘-DDE can be injected at regular intervals throughout an analytical sequence to monitor GC degradation. Some U.S. EPA methods limit GC breakdown of DDT in the PES to ???20% GC/MS analysis of large-volume natural water samples fortified with deuterium- and 13C-labeled p,p‘-DDT exhibited up to 65% DDT breakdown by the GC inlet. These matrix-enhanced GC degradation amounts substantially exceeded the <20% breakdown levels indicated by bracketing injections of the PES containing unlabeled and labeled DDT. Substantial matrix-enhanced GC degradation was not observed during analysis of a limited number of fractionated bed-sediment extracts containing labeled DDT. Use of isotopically labeled DDT seems to provide an effective tool for monitoring sample-specific DDT breakdown during GC/MS analysis. However, analyte co- elutions render impractical their use in GC/ECD analysis. The occurrence of matrix-enhanced GC degradation might have important implications on data quality and the resultant interpretations of the environmental degradation of DDT and other thermolabile contaminants. |
| Genre: | Article |
| ProdID: | 70019936 |
| Citation Author: | Foreman, W. T.; Gates, P. M. |
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| Citation End Page: | 910 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Science and Technology |
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| Citation Number Of Pages: | 6 |
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| Citation Search Results Text: | Matrix-enhanced degradation of p,p‘-DDT during gas chromatographic analysis: A consideration; 1997; Article; Journal; Environmental Science and Technology; Foreman, W. T.; Gates, P. M. |
| Citation Start Page: | 905 |
| Citation Volume: | 31 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Matrix-enhanced degradation of p,p‘-DDT during gas chromatographic analysis: A consideration; 1997; Article; Journal; Environmental Science and Technology; Foreman, W. T.; Gates, P. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1021/es960671q |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
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