铁氰化镍／银复合修饰电极的制备及对盐酸麻黄碱的电催化作用

在含有Ag^＋、Ni^2＋、K3Fe（CN）6的胶体混合溶液中，用电化学沉积方法制备了铁氰化镍／银复合膜（NiHCF／Ag）修饰石墨电极（SG）．在pH5．00的醋酸-醋酸铵缓冲液中，NiHCF／Ag／SG修饰电极对盐酸麻黄碱的电极反应有催化作用，盐酸麻黄碱还原峰的峰电流与浓度在8．00×10^-6～1．30×10^-3mol／L范围内呈良好线性关系（r=0．982），检出限为5．00×10^-7mol／L．该电极已成功用于医用注射液中盐酸麻黄碱含量的测定，回收率为95.4％～104％．

Preparation of a mixed nicke/silver hexacyanoferrate modified electrode and its electrocatalytic effect on ephedrine hydrochloride

The mixed inorganic nickel and silver hexacyanoferrate （NiHCF/Ag） is deposited on a graphite（SG） electrode by electrochemical deposition in a colloidal mixed solution containing Ag^＋, Ni^2＋ and K3Fe（CN）6. Further experimental results indicate that NiHCF/Ag has electrocatalytic activities toward the EphedrineHydrochloride in HAc-NH4Ac buffer solution （pH5. 00） . There is an excellent linearity between reductive current and concentration of EphedrineHydrochloride in the range 8. 00×10^- 6 ×1.30× 10^- 3mol/L（r=0. 982） with a detection limit of 5. 00 × 10^- 7mol/L . Its recovery rate is between 95.4% and 104%. This method has been applied to the determination of the content of EphedrineHydrochloride injections.