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Enantioselective Stable Isotope Analysis (ESIA) of polar herbicides.

Anal. Bioanal. Chem. 405, 2825-2831 (2013)
DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Assessing the environmental fate of chiral micropollutants such as herbicides is challenging. The complexity of aquatic systems often makes it difficult to obtain hydraulic mass balances, which is a prerequisite when assessing degradation based on concentration data. Elegant alternatives are concentration-independent approaches like compound-specific isotope analysis or enantiospecific concentration analysis. Both detect degradation-induced changes from ratios of molecular species, either isotopologues or enantiomers. A combination of both-enantioselective stable isotope analysis (ESIA)-provides information on C-13/C-12 ratios for each enantiomer separately. Recently, Badea et al. demonstrated for the first time ESIA for the insecticide alpha-hexachlorocyclohexane. The present study enlarges the applicability of ESIA to polar herbicides such as phenoxy acids: 4-CPP ((RS)-2-(4-chlorophenoxy)-propionic acid), mecoprop (2-(4-chloro-2-methylphenoxy)-propionic acid), and dichlorprop (2-(2,4-dichlorophenoxy)-propionic acid). Enantioselective gas chromatography-isotope ratio mass spectrometry was accomplished with derivatization prior to analysis. Precise carbon isotope analysis (2 sigma a parts per thousand currency signaEuro parts per thousand 0.5aEuro degrees) was obtained with a parts per thousand yen7 ng C on column. Microbial degradation of dichlorprop, 2-(2,4-dichlorophenoxy)-propionic acid by Delftia acidovorans MC1 showed pronounced enantiomer fractionation, but no isotope fractionation. In contrast, Badea et al. observed isotope fractionation, but no enantiomeric fractionation. Hence, the two lines of evidence appear to complement each other. They may provide enhanced insight when combined as ESIA.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Chiral Micropollutants ; Pesticides ; Derivatization ; Isotope Fractionation ; Herbicide ; Bf3; Ratio Mass-spectrometry ; Organic Contaminants ; Acid-derivatives ; Fractionation ; Transformation ; Tetrachloroethene ; Biodegradation ; Fate ; Dechlorination ; Degradation
ISSN (print) / ISBN 1618-2642
e-ISSN 1618-2650
Quellenangaben Band: 405, Heft: 9, Seiten: 2825-2831 Artikelnummer: , Supplement: ,
Verlag Springer
Verlagsort Heidelberg
Begutachtungsstatus Peer reviewed