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Simplifying and improving the extraction of nitrate from freshwater for stable isotope analyses

Minet, Eddy and Goodhue, Robbie and Coxon, Catherine E. and Kalin, Robert M. and Meier-Augenstein, Wolfram (2011) Simplifying and improving the extraction of nitrate from freshwater for stable isotope analyses. Journal of Environmental Monitoring, 13 (7). pp. 2062-2066. ISSN 1464-0325

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Determining the isotopic composition of nitrate (NO3_) in water can prove useful to identify NO3_ sources and to understand its dynamics in aquatic systems. Among the procedures available, the ‘ionexchange resin method’ involves extracting NO3_ from freshwater and converting it into solid silver nitrate (AgNO3), which is then analysed for 15N/14N and 18O/16O ratios. This study describes a simplified methodology where water was not pre-treated to remove dissolved organic carbon (DOC) or barium cations (added to precipitate O-bearing contaminants), which suited samples with high NO3_ ($400 mM or 25 mg L_1 NO3_) and low DOC (typically <417 mM of C or 5 mg L_1 C) levels. % N analysis revealed that a few AgNO3 samples were of low purity (compared with expected % N of 8.2), highlighting the necessity to introduce quality control/quality assurance procedures for silver nitrate prepared from field water samples. Recommendations are then made to monitor % N together with % O (expected at 28.6, i.e. 3.5 fold % N) in AgNO3 in order to better assess the type and gravity of the contamination as well as to identify potentially unreliable data.

Item type: Article
ID code: 34290
Keywords: nitrate, freshwater, isotope analysis, ionexchange resin method’, Engineering (General). Civil engineering (General), Environmental technology. Sanitary engineering, Public Health, Environmental and Occupational Health, Management, Monitoring, Policy and Law
Subjects: Technology > Engineering (General). Civil engineering (General)
Technology > Environmental technology. Sanitary engineering
Department: Faculty of Engineering > Civil and Environmental Engineering
Depositing user: Pure Administrator
Date Deposited: 07 Oct 2011 19:05
Last modified: 21 Jul 2015 21:28
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