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. 2014 Aug 12;2014:831908. doi: 10.1155/2014/831908

Figure 1.

Figure 1

Hydrogenic potential changes in the tested materials according to different periods of time. No significant difference was observed in the mean values for the pH reading of each tested material (P > 0.05). During the experimental period, the values of pH were high (alkaline) from the beginning until the end.