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This document specifies a method for instrumental analysis by equilibration-isotope ratio mass spectrometry (Eq-IRMS) of liquid, aqueous food matrices to determine 18O/16O isotope ratios of the water of the product. The 18O/16O isotope ratios obtained by following this document are expressed as δ18O values relative to internationally recognized reference materials (RM).
This document does not apply to sample preparation. It is assumed that the food sample has been pre-treated as necessary and homogenized.
Similarly, the interpretation of the obtained δ18O values is not covered by this document. Following this protocol will result only in isotope delta values for the sample materials.
Although other instrumental techniques can be applied to determine δ18O values in liquid, aqueous food materials, these other techniques are not covered by this document.
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