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Spahr, S.* ; Huntscha, S.* ; Bolotin, J.* ; Maier, M. ; Elsner, M. ; Hollender, J.* ; Hofstetter, T.B.*

Compound-specific isotope analysis of benzotriazole and its derivatives.

Anal. Bioanal. Chem. 405, 2843-2856 (2013)
DOI PMC
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Compound-specific isotope analysis (CSIA) is an important tool for the identification of contaminant sources and transformation pathways, but it is rarely applied to emerging aquatic micropollutants owing to a series of instrumental challenges. Using four different benzotriazole corrosion inhibitors and its derivatives as examples, we obtained evidence that formation of organometallic complexes of benzotriazoles with parts of the instrumentation impedes isotope analysis. Therefore, we propose two strategies for accurate C and N measurements of polar organic micropollutants by gas chromatography isotope ratio mass spectrometry (GC/IRMS). Our first approach avoids metallic components and uses a Ni/Pt reactor for benzotriazole combustion while the second is based on the coupling of online methylation to the established GC/IRMS setup. Method detection limits for on-column injection of benzotriazole, as well as its 1-CH-, 4-CH-, and 5-CH-substituted species were 0.1-0.3 mM and 0.1-1.0 mM for delta C-13 and delta N-15 analysis respectively, corresponding to injected masses of 0.7-1.8 nmol C and 0.4-3.0 nmol N, respectively. The Ni/Pt reactor showed good precision and was very long-lived (1000 successful measurements). Coupling isotopic analysis to offline solid-phase extraction enabled benzotriazole-CSIA in tap water, wastewater treatment effluent, activated sludge, and in commercial dishwashing products. A comparison of C and N values from different benzotriazoles and benzotriazole derivatives, both from commercial standards and in dishwashing detergents, reveals the potential application of the proposed method for source apportionment.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
Schlagwörter Csia ; Gas Chromatography Isotope Ratio Mass Spectrometry ; Benzotriazole ; Corrosion Inhibitors ; Micropollutants ; Source Identification; Chromatography Mass-spectrometry ; Gas-chromatography ; Organic-compounds ; Nitroaromatic Compounds ; Corrosion-inhibitors ; Waste-water ; Nitrogen ; Carbon ; Fractionation ; Transformation
ISSN (print) / ISBN 1618-2642
e-ISSN 1618-2650
Zeitschrift Analytical and Bioanalytical Chemistry
Quellenangaben Band: 405, Heft: 9, Seiten: 2843-2856 Artikelnummer: , Supplement: ,
Verlag Springer
Verlagsort Heidelberg
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Groundwater Ecology (IGOE)