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SDBS-CrBAT sorption isothermsrnSorption isotherms were detemined at two different pH levels,i.e.pH=3 where most free NH2-groups are in the form of-NH3+,and under isoelectric conditions(pH～6.5)where a different interaction mechanism may be assumed and where,in addition,differences between Qt were recorded.Results are indicated in Fig.2.rn