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.
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 |
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 |
Google Analytic Metrics | Metrics page |