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13C- and 15N-isotope analysis of desphenylchloridazon by Liquid chromatography-isotope-ratio mass spectrometry and derivatization gas chromatography-isotope-ratio mass spectrometry.
Anal. Chem. 91, 3412-3420 (2019)
The widespread application of herbicides impacts surface water and groundwater. Metabolites (e.g., desphenylchloridazon from chloridazon) may be persistent and even more polar than the parent herbicide, which increases the risk of groundwater contamination. When parent herbicides are still applied, metabolites are constantly formed and may also be degraded. Evaluating their degradation on the basis of concentration measurements is, therefore, difficult. This study presents compound-specific stable isotope analysis (CSIA) of nitrogen- and carbon-isotope ratios at natural abundances as an alternative analytical approach to track the origin, formation, and degradation of desphenylchloridazon (DPC), the major degradation product of the herbicide chloridazon. Methods were developed and validated for carbon- and nitrogen-isotope analysis (delta C-13 and delta N-15) of DPC by liquid chromatography-isotope-ratio mass spectrometry (LC-IRMS) and derivatization gas chromatography-IRMS (GC-IRMS), respectively. Injecting standards directly onto an Atlantis LC-column resulted in reproducible delta(13)-isotope analysis (standard deviation <0.5 parts per thousand) by LC-IRMS with a limit of precise analysis of 996 ng of DPC on-column. Accurate and reproducible delta N-15 analysis with a standard deviation of <0.4 parts per thousand was achieved by GC-IRMS after derivatization of >100 ng of DPC with 160-fold excess of (trimethylsilyl)diazomethane. Application of the method to environmental-seepage water indicated that newly formed DPC could be distinguished from "old" DPC by the different isotopic signatures of the two DPC sources.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Compound-specific Carbon; Pesticide Degradation; Organic-compounds; Contaminants; Groundwater; Water; Trimethylsilyldiazomethane; Fractionation; Methylation; Metabolites
Language
english
Publication Year
2019
HGF-reported in Year
2019
ISSN (print) / ISBN
0003-2700
e-ISSN
1520-6882
Journal
Analytical Chemistry
Quellenangaben
Volume: 91,
Issue: 5,
Pages: 3412-3420
Publisher
American Chemical Society (ACS)
Publishing Place
1155 16th St, Nw, Washington, Dc 20036 Usa
Reviewing status
Peer reviewed
Institute(s)
Institute of Groundwater Ecology (IGOE)
POF-Topic(s)
20403 - Sustainable Water Management
Research field(s)
Environmental Sciences
PSP Element(s)
G-504390-001
WOS ID
WOS:000460709200034
Scopus ID
85062071927
PubMed ID
30672693
Erfassungsdatum
2019-03-18