No abstract

A pre-anodized inlaying ultrathin carbon paste electrode (PAIUCPE) was constructed using simple and fast electrochemical pretreatment for the simultaneous determination of ascorbic acid (AA) and acetaminophen (ACOP). The effect of pH on peak current and peak potential for the oxidation of AA and ACOP was discussed in detail. The results showed that the size of i p of AA and ACOP was closely related to the degree of oxygen reduction reaction at the auxiliary electrode. In pH 5.00 phosphate buffer solution, a linear relationship between oxidation peak current and concentration of AA and ACOP was obtained in the range of 1.0 Â 10 À5 to 1.5 Â 10 À3 mol L À1 and 3.0 Â 10 À7 to 2.0 Â 10 À4 mol L À1 , and the detection limits were estimated to be 3.10 Â 10 À7 mol L À1 and 2.28 Â 10 À8 mol L À1 , respectively. The constructed electrode exhibited excellent reproducibility and stability. Moreover, this method was employed to determine AA and ACOP in Vitamin C Yinqiao Tablets with satisfactory results.

No abstract

No abstract

In this paper, nichrome was adopted as a substrate, to fabricate the pre-anodized inlaying ultrathin carbon paste electrode (PAIUCPE). The electrochemical behaviors and diffusion mechanisms of three dihydroxybenzene isomers at the electrode were carefully investigated. The effect of pH on oxidation peak current was also detailedly explained. The results were shown that oxidation peak current not only related to the reaction of electroactive materials at the working electrode, but also depended on the reaction variable of reduction at the auxiliary electrode. mol/L, respectively. The proposed method was successfully applied in the simultaneous determination of dihydroxybenzene isomers in artificial sewage samples with satisfactory results.