We purchased from Sigma 1,10-phenanthroline (C12H8N2),
cadmium chloride (CdCl2), sodium sulfide nonahydrate (NaSH2O),
potassium ferricyanide [K3Fe(CN)6], and hydrogen peroxide
(H2O2, 30%). Beijing Jingxi Huagong Co., Ltd. (Beijing, China) supplied
the phosphoric acid solution (85 wt% in H2O), potassium
hydroxide (NaOH), ethanol (95 wt%), and acetone. All chemicals
are analytical grade and used without further purification.
We purchased from Sigma 1,10-phenanthroline (C12H8N2), cadmium chloride (CdCl2), sodium sulfide nonahydrate (NaSH2O),potassium ferricyanide [K3Fe(CN)6], and hydrogen peroxide(H2O2, 30%). Beijing Jingxi Huagong Co., Ltd. (Beijing, China) suppliedthe phosphoric acid solution (85 wt% in H2O), potassiumhydroxide (NaOH), ethanol (95 wt%), and acetone. All chemicalsare analytical grade and used without further purification.
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