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研究柠檬酸(CA)修饰玻碳电极(CA/GC)在抗坏血酸(AA)、多巴胺(DA)和尿酸(UA)混合体系中的循环伏安(CV)行为.结果表明,AA、DA和UA在CA/GC电极上氧化峰电流增大,且三者氧化峰电位明显分离(ΔEp(DA,AA)=170 mV,ΔEp(DA,UA)=130 mV,ΔEp(AA,UA)=300 mV).据此,可同时检测AA、DA和UA.在优化的实验条件下,AA、DA和UA的氧化峰电流与其浓度分别在2.0×10-6～1.5×10-3mol.L-1,6.0×10-7～1.0×10-3mol.L-1和6.0×10-7～1.0×10-3mol.L-1范围内呈线性关系.该电极重现性好,可用于盐酸多巴胺针剂DA、VC片剂AA及人体尿液UA的测定.
The cyclic voltammetry (CV) behavior of citric acid (CA) -based glassy carbon electrode (CA / GC) in a mixed system of ascorbic acid (AA), dopamine (DA) and uric acid (UA) was studied.The results showed that AA, DA and UA The peak current of oxidation increased at the CA / GC electrode and the three peak potentials were significantly separated (ΔEp (DA, AA) = 170 mV, ΔEp (DA, UA) = 130 mV, ΔEp (AA, UA) = 300 mV ) .According to this, simultaneous detection of AA, DA and UA under the optimal experimental conditions, AA, DA and UA oxidation peak current and its concentration were 2.0 × 10-6 ~ 1.5 × 10-3mol.L-1, 6.0 × 10-7 ~ 1.0 × 10-3mol.L-1 and 6.0 × 10-7 ~ 1.0 × 10-3mol.L-1.The electrode has good reproducibility and can be used in dopamine hydrochloride injection DA , VC tablet AA and human urine UA determination.