OpenSSL SSL_connect: Connection reset by peer in connection to v2.sherpa.ac.uk:443 PuSH - Publication Server of Helmholtz Zentrum München: Precise and accurate compound specific carbon and nitrogen isotope analysis of atrazine: Critical role of combustion oven conditions.

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Meyer, A.H. ; Penning, H. ; Lowag, H. ; Elsner, M.

Precise and accurate compound specific carbon and nitrogen isotope analysis of atrazine: Critical role of combustion oven conditions.

Environ. Sci. Technol. 42, 7757-7763 (2008)
DOI
Open Access Green as soon as Postprint is submitted to ZB.
Compound-specific stable isotope analysis by gas chromatography-isotope ratio mass spectrometry (GC-IRMS) is increasingly used to assess origin and fate of organic substances in the environment. Although analysis without isotopic discrimination is essential, it cannot be taken for granted for new target compounds. We developed and validated carbon isotope analysis of atrazine, a herbicide widely used in agriculture. Combustion was tested with reactors containing (i) CuO/NiO/Pt operating at 940 °C; (ii) CuO operating at 800 °C; (iii) Ni/NiO operating at 1150 °C and being reoxidized for 2 min during each gas chromatographic run. Accurate and precise carbon isotope measurements were only obtained with Ni/NiO reactors giving a mean deviation ??13C from dual inlet measurements of -0.1-0.2‰ and a standard deviation (SD) of ±0.4‰. CuO at 800 °C gave precise, but inaccurate values (??13C = -1.3‰, SD ±0.4‰), whereas CuO/NiO/Pt reactors at 940 °C gave inaccurate and imprecise data. Accurate (??15N = 0.2‰) and precise (SD ±0.3‰) nitrogen isotope analysis was accomplished with a Ni/NiO-reactor previously used for carbon isotope analysis. The applicability of the method was demonstrated for alkaline hydrolysis of atrazine at 20 °C and pH 12 (nucleophilic aromatic substitution) giving ?carbon = -5.6‰ ± 0.1‰ (SD) and ?nitrogen = -1.2‰ ± 0.1‰ (SD).
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
ISSN (print) / ISBN 0013-936X
e-ISSN 1520-5851
Journal Environmental Science & Technology
Quellenangaben Volume: 42, Issue: 21, Pages: 7757-7763 Article Number: , Supplement: ,
Publisher ACS
Publishing Place Washington, DC
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Groundwater Ecology (IGOE)