Picarro 液态水同位素分析仪分析饮料中水同位素

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Hydrogen (d2H) and oxygen (d18O) stable isotope analysis is useful when tracing the origin of water in beverages, but traditional analytical techniques are limited to pure or extracted waters. We measured the isotopic composition of extracted beverage water using both isotope ratio infrared spectroscopy (IRIS; specifically, wavelength-scanned cavity ring-down spectroscopy) and isotope ratio mass spectrometry (IRMS). We also analyzed beer, sodas, juices, and milk as is using IRIS. For IRIS analysis, four sequential injections of each sample were measured and data were corrected for
sample-to-sample memory using injections (a) 1-4, (b) 2-4, and (c) 3-4. The variation between d2H and d18O values calculated using the three correction methods was larger for unextracted (i.e., complex)
beverages than for waters. The memory correction was smallest when using injections 3-4. Beverage water d2H and d18O values generally fit the Global Meteoric Water Line, with the exception of water
from fruit juices. The beverage water stable isotope ratios measured using IRIS agreed well with the IRMS data and fit 1:1 lines, with the exception of sodas and juices (d2H values) and beers (d18O
values). The d2H and d18O values of waters extracted from beer, soda, juice, and milk were correlated with complex beverage d2H and d18O values (r¼0.998 and 0.997, respectively) and generally fit 1:1
lines. We conclude that it is possible to analyze complex beverages, without water extraction, using IRIS although caution is needed when analyzing beverages containing sugars, which can clog the syringe and increase memory, or alcohol, a known spectral interference. Picarro L2140-i超高精度液态水/水汽同位素分析仪 Picarro L2120-I 液态水和水汽同位素分析仪