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Fig. 6. Diffusion coefficients versus volumetric water content for this and other work. Legend "15 mm tuff, this work (LA-ICP/MS)" includes the coefficients of surface diffusion for Br– in both cubic and tetrahedral sinks (Table 2). Diffusion coefficients reported in Conca and Wright (1992) were for 86 soil and gravel samples, various bentonites, and rock core of tuff basalt and mudstone. The size of crushed tuff and silica sand was not reported (CRWMS M&O, 2000a).
