Matrix-enhanced degradation of p,p'-DDT during gas chromatographic analysis: A consideration
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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 notp,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 oc currence 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.
Suggested Citation
Foreman, W., Gates, P.M., 1997, Matrix-enhanced degradation of p,p'-DDT during gas chromatographic analysis: A consideration: Environmental Science & Technology, v. 31, no. 3, p. 905-910, https://doi.org/10.1021/es960671q.
ISSN: 1520-5851 (online)
ISSN: 0013-936X (print)
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Matrix-enhanced degradation of p,p'-DDT during gas chromatographic analysis: A consideration |
| Series title | Environmental Science & Technology |
| DOI | 10.1021/es960671q |
| Volume | 31 |
| Issue | 3 |
| Publication Date | February 27, 1997 |
| Year Published | 1997 |
| Language | English |
| Publisher | ACS Publications |
| Contributing office(s) | National Water Quality Laboratory, Washington Water Science Center |
| Description | 6 p. |
| First page | 905 |
| Last page | 910 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |