Publication costs assisted by The Petroleum Research Fund Ultrapure water (>15 megohm cm, 25°) was saturated with various "inert" gases: H2, O2, N2, He, Ar, CH4, and CO. The pH difference between degassed water and water saturated with a gas was found to be ±0.06 (too) for individual measurements and ±0.01 (Í90) for the average of a series of measurements. These differences are considered to be within experimental error at a pH of 7.00. Thus, previously reported "anomalous" pH effects are either due to impurities in materials or artifacts in the experiment.
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