Polymeric dyes preparative procedures

We have chosen another type of Amberlite resin, polymeric adsorbent XAD 1168, as a support in order to investigate its influence on dissociation constant of the dye. An identical, as previously described, procedure of immobilization was applied and a saturated solution of BTB was used. In this case the dye-support binding forces were mainly based on physical sorption interactions. Figure 7 compares calibration curves of the pH sensors based on the membranes prepared from different Amberlite resins. 

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