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. 2017 Jun 1;75:791–797. doi: 10.1016/j.msec.2017.02.133

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© 2017 +98-54-3344-6565

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Fig. 5. — (a) Chronocoulograms obtained at POMANS-MWCNT/GPE in 0.1 M PBS (pH 6.0) for different concentrations of UA. The numbers 1–5 correspond to 0, 0.07, 0.11, 0.14, and 0.18 of UA. (b) plots of Q vs. t^1/2obtained from chronoamperograms 2–5. (c) Plot of the slope of the straight lines against UA concentration. Similarly, chronocoulometric response of the modified POMA/MWCNT/GPE in 0.1Mphosphate buffer solution (pH 6.0) at potential step of 0.75Vfor different concentrations of FA (a′).The letters 1–4 correspond to 0, 0.05, 0.13 and 0.19 mM FA. (b′) plots of Q versus t^1/2 obtained from the chronocoulograms and(c′) plot of the straight lines against the FA concentration.