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. 2012 Dec 28;13(1):484–499. doi: 10.3390/s130100484

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 9. — I_Norm versus time acquired at different pH values in the range 7.0–8.0. The steady state pH values of the solution as measured by the reference instrument are reported close to the curve.