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Fig. 2. Sorption of total organic C (TOC) by sample clays (see Table 1) at room temperature (18°C) as a function of the concentration of xanthan at pH 4, both in the (a) presence and (b) absence of 10 mmol L^–1 Ca(NO₃)₂. Values are averages of 1 to 10 replications. Error bars are standard deviations of the means.