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To assess sources and degradation of the herbicide glyphosate [N-(phosphonomethyl) glycine] and its metabolite AMPA (aminomethylphosphonic acid), concentration measurements are often inconclusive and even 13C/12C analysis alone may give limited information. To advance isotope ratio analysis of an additional element, we present compound-specific 15N/14N analysis of glyphosate and AMPA by a two step...
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