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By mixing 1H2O and 2H2O, both with accurately known purity, samples were prepared with 2H/1H ratios close to those of the international isotopic water standards: V-SMOW and SLAP. A mass spectrometrical comparison of these calibration samples with the actual water standards revealed:

2H/1H of V-SMOW = (155.95 ± 0.08) × 10−6

2H/1H of SLAP = (89.12 ± 0.07) × 10−6

δ2HV-SMOW(SLAP) =−428.5 ± 0.5 %