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Dichlorodiphenyltrichloroethane determination in air by thermal desorption gas chromatography–mass spectrometry
Author(s) -
Martin Nicholas J,
Smith Philip A,
Brown Carlis W,
Achee Nicole L,
DeLong Gerald T
Publication year - 2012
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3313
Subject(s) - tenax , chromatography , thermal desorption , chemistry , mass spectrometry , gas chromatography , detection limit , gas chromatography–mass spectrometry , extraction (chemistry) , sampling (signal processing) , analytical chemistry (journal) , dilution , desorption , adsorption , thermodynamics , physics , organic chemistry , filter (signal processing) , computer science , computer vision
BACKGROUND: Current quantitative methods for airborne dichlorodiphenyltrichloroethane (DDT) require collection and extraction times of ≥ 12 h. The aim of this study was to develop a method for quantifying airborne DDT with a short (<4 h) collection and analysis time. RESULTS: Precision [relative standard deviation (RSD)] for each calibration point (0.8–9.0), linearity ( R 2 = 0.99) and apparent recovery ( R ′ = 96.5%) were determined from thermal desorption (TD) gas chromatography–mass spectrometry (GC‐MS) analyses of Tenax‐TA‐packed sampling tubes spiked with 1–250 ng of DDT. Recovery of 13 C‐labeled 4,4′‐DDT from tubes spiked before and after air sampling was 97.3 and 90.3% respectively. DDT was detected and quantified in 1–3 L samples of air collected during 10–180 min sampling events. A significant difference was observed in DDT air concentration between 28 and 33 °C during microchamber studies. CONCLUSIONS: The results demonstrate that the TD GC‐MS method developed in this study is precise, reproducible and linear over the span of 1–250 ng of DDT spiked onto TD tubes. By avoiding dilution of the sample, the method described allows the measurement of DDT vapor concentrations during short sampling periods (10–180 min) relevant to mosquito behavior studies. Published 2012 by John Wiley & Sons, Ltd.