Diffusion coefficients in cold sulfuric acid solution

The diffusion coefficients of dimethyl sulfoxide, dimethyl sulfone, N-15-la beled DNO3, and O-17-labeled D2O in solutions of 0.6-0.8 weight fraction D2 SO4 in D2O were studied at temperatures from 248 to 298 K by the pulsed gra dient spin-echo NMR technique. Diffusion coefficients for these compounds a re reported, and an empirical technique for extrapolating the results to su lfuric acid of stratospheric compositions and temperatures is discussed. Th e viscosity of 0.7 weight fraction D2SO4 in D2O at temperatures from 248 to 298 K is also reported.