Fig. 5
High turn-on ration and 1H-NMR recover results. a A concentration of 10−4 M 1 ethanol solution mediated with NH2NH2/HCl; BA denotes adding acid to base treated (denoted as B) colorless solution; S/N = 4436/0.036. b 1H-NMR experiments, 1 + EDA + HCl denotes add HCl to the colorless 1 + EDA solution; δ 2.56 is ascribed to -CH2CH2- of EDA or EDA-HCl, δ 1.94 is CD3CN solvent peak
