Fig. 12.3. Uptake of toluene in the ceramic dosimeter measured over 8 weeks. A constant aqueous toluene concentration was obtained and maintained by pre-loaded Dowex Optipore L-493 serving as a reservoir. The measured values 1 to 3 represent three replicates that were taken from the same batch container at each time point. Lines represent the calculated cumulative mass uptake (Eq. (12.2)) for different Archie's law exponents m. The best fit was obtained for m = 1.92 (e = 0.305, DC = 4.100 mgL"1, De = 9.58 x 10 " for 20°C, Dx = 0.15 cm, A = 7.6 cm2).

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