The diffusion coefficients D of important gas tracers dissolved in water and seawater were measured with a modified Barrer method. The measurements include the gases He, Ne, Kr, Xe, H2, CH4, and CO2 dissolved in distilled water in the temperature range from $ to 35øC, and He and H• dissolved in seawater in the same temperature range. The maximum systematic error is estimated to be well below $%. The isotopic fractionation in the diffusion coefficient, eD, was determined to be (-0.87 q-0.05)%0 for •3CO•/t •CO2 and (15 q-3)% for SHe/4He.

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