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在外加电压为0.2 V时,通过偶合α-萘酚在一支电极上的氧化和氧化铂在另一支电极上的还原两个不可逆电极过程,构建了双安培法直接检测α-萘酚的新方法。在pH5.33的Britton-Robinson缓冲溶液中,测得α-萘酚的氧化电流与其浓度在8.0×10-6~8.0×10-4mol/L范围内呈良好的线性关系(r=0.9927,n=9),检出限为2.0×10-6mol/L。连续30次测定1.0×10-5mol/L的α-萘酚,其峰电流RSD为2.6%,常用药物赋形剂和无机离子均不干扰α-萘酚的测定。方法已用于摸拟样中α-萘酚含量的测定。
At an applied voltage of 0.2 V, two irreversible electrode processes were achieved by the oxidation of coupled α-naphthol on one electrode and the reduction of platinum oxide on the other electrode. new method. In Britton-Robinson buffer solution of pH5.33, the oxidation current of α-naphthol showed a good linear relationship with the concentration of 8.0 × 10-6 ~ 8.0 × 10-4mol / L (r = 0.9927, n = 9), the detection limit was 2.0 × 10-6mol / L. The concentration of 1.0 × 10-5mol / L α-naphthol was determined continuously for 30 times and the peak current RSD was 2.6%. The common pharmaceutical excipients and inorganic ions did not interfere with the determination of α-naphthol. The method has been used to determine α-naphthol content in the mock samples.