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(A) Representative HIs include tridodecylamine, nonadecylpyridine, octadecyl isonicotinate, dipropylaminoazobenzene and Nile blue. (B) The pH–response mechanism of HI–based SC–ISEs. GC—glass carbon electrode substrate; SC—solid contact; ISM—ion-selective membrane; ET—electron transfer; IT—ion transfer; aq—aqueous solution.
