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Title: Triple-Element Compound-Specific Stable Isotope Analysis (3D-CSIA): Added value of Cl isotope ratios to assess herbicide degradation
Author: Torrentó Aguerri, Clara
Ponsin, V.
Lihl, C.
Hofstetter, T.B.
Baran, N.
Elsner, M.
Hunkeler, D.
Keywords: Plaguicides
Contaminació dels sòls
Soil pollution
Issue Date: 19-Oct-2021
Publisher: American Chemical Society
Abstract: Multielement isotope fractionation studies to assess pollutant transformation are well-established for point-source pollution but are only emerging for diffuse pollution by micropollutants like pesticides. Specifically, chlorine isotope fractionation is hardly explored but promising, because many pesticides contain only few chlorine atoms so that 'undiluted' position-specific Cl isotope effects can be expected in compound-average data. This study explored combined Cl, N, and C isotope fractionation to sensitively detect biotic and abiotic transformation of the widespread herbicides and groundwater contaminants acetochlor, metolachlor, and atrazine. For chloroacetanilides, abiotic hydrolysis pathways studied under acidic, neutral, and alkaline conditions as well as biodegradation in two soils resulted in pronounced Cl isotope fractionation (εCl from −5.0 ± 2.3 to −6.5 ± 0.7¿). The characteristic dual C-Cl isotope fractionation patterns (ΛC-Cl from 0.39 ± 0.15 to 0.67 ± 0.08) reveal that Cl isotope analysis provides a robust indicator of chloroacetanilide degradation. For atrazine, distinct ΛC-Cl values were observed for abiotic hydrolysis (7.4 ± 1.9) compared to previous reports for biotic hydrolysis and oxidative dealkylation (1.7 ± 0.9 and 0.6 ± 0.1, respectively). The 3D isotope approach allowed differentiating transformations that would not be distinguishable based on C and N isotope data alone. This first data set on Cl isotope fractionation in chloroacetanilides, together with new data in atrazine degradation, highlights the potential of using compound-specific chlorine isotope analysis for studying in situ pesticide degradation.
Note: Versió postprint del document publicat a:
It is part of: Environmental Science & Technology, 2021, vol. 55, num. 20, p. 13891-13901
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ISSN: 0013-936X
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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