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. 2012 Sep 15;99(2-3):194–201. doi: 10.1016/j.talanta.2012.05.039

Fig. 5.

Fig. 5

Calibration curves of the sensor based on silica gel beads (A) and on poly(HEMA) beads (B), measured at different ionic strengths (IS), and corresponding pH1/2 values (pH value at which half of the overall pH-dependent signal change is observed).