Samples are precisely weighed to provide 20 to 200 micrograms of nitrogen for d15N analysis. Precision (as average standard deviation) on well prepared samples will generally be better than 0.3‰. We report nitrogen results referenced to air and if required the %N obtained from our total beam values.
Although we prefer to weigh your samples we are able to accept pre-weighed encapsulated samples for this service. We monitor our IRMS total beam values to ensure that the weight criteria is met and will inform you if there are any discrepancies.
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