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HERO ID
3491054
Reference Type
Journal Article
Title
Classification of nine malathion emulsion samples by using carbon isotope ratios and the ratio of organic solvents
Author(s)
Suto, N; Kawashima, H
Year
2017
Is Peer Reviewed?
1
Journal
Science and Justice
ISSN:
1355-0306
Volume
57
Issue
1
Page Numbers
1-5
Language
English
PMID
28063579
DOI
10.1016/j.scijus.2016.10.009
Abstract
The compound specific isotope analysis is nowadays an important and powerful tool in geochemical, environmental and forensics field. On November 2013, Aqli Foods Corporation in Japan dealt with complaints about stench from frozen foods produced. Subsequently, very high concentrations of organophosphorus pesticide as malathion, ethylbenzene and xylene were detected in recovered frozen foods. In particular case, we present the method to measure the stable carbon isotope ratio (δ(13)C) of nine malathion emulsion pesticides using gas chromatography/isotope ratio mass spectrometry (GC/IRMS) to identify the source. The δ(13)C values of malathion ranged from -30.6‰ to -29.5‰. Because malathion used in all malathion emulsions sold in Japan is imported from the same overseas company, Cheminova, Denmark. The δ(13)C values of ethylbenzene ranged from -28.2‰ to -20.8‰ and those of m,p-xylene from -28.7‰ to -25.2‰. The differences in the δ(13)C values may be because of the material itself and chemical processing. We also determined the ratio of ethylbenzene to m,p-xylene and finally categorized the nine malathion samples into five groups on the basis of this ratio and the δ(13)C values of ethylbenzene and m,p-xylene. The results of isotopic fractionation during volatilization (refrigerate, room temperature and incubator) was negligible small.
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Ethylbenzene
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