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肌酐能够和Cu~(2+)生成络合物,该络合物可以吸附于玻碳电极表面,在pH3.50的NH_4Cl-HCl底液中,吸附于电极表面的肌酐-Cu~(2+)络合物在较负的电位下还原为肌酐-Cu~+,当电极向正向扫描时,产生一个灵敏的表面催化波,其峰电流和肌酐的浓度在1.0×10~(-5)～1.0×10~(-8)mol/L范围内有良好的线性关系,其检出限为1.0×10~(-9)mol/L(富集5min).研究了肌酐-Cu~(2+)络合物在玻碳电极上的氧化还原机理,选择了测定肌酐的最佳实验条件,建立了测定肌酐的新的灵敏的方法.
Creatinine can form complexes with Cu 2+, which can be adsorbed on the surface of glassy carbon electrode. In NH_4Cl-HCl solution with pH3.50, creatinine-Cu 2+ adsorbed on electrode surface ) Complex was reduced to creatinine-Cu ~ + under negative potentials. When the electrode was scanned in the forward direction, a sensitive surface catalytic wave was produced. The peak current and creatinine concentration were in the range of 1.0 × 10 ~ (-5) ~ 1.0 × 10 ~ (-8) mol / L with a detection limit of 1.0 × 10 -9 mol / L (enrichment for 5 min) +) Complex on the glassy carbon electrode, the best experimental conditions for the determination of creatinine were selected and a new and sensitive method for the determination of creatinine was established.