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结晶紫(CV)在导电碳黑糊电极(CCBPE)上具有灵敏的伏安响应,实验对其氧化还原机理进行了推导,结果表明:以pH 8.0的B-R缓冲液为支持电解质,CV发生2电子转移的不可逆氧化,过程受吸附控制。在富集时间、富集电位、pH等影响因子得到优化情况下,其半微分-脉冲伏安扫描氧化峰值与其浓度在0.03~1.30μmol/L范围内呈线性,检出限为10 nmol/L。据此建立了CV的电化学快检方法,并应用于淡水渔业水体中痕量CV的测定,平均回收率为97.1%。
The crystal violet (CV) has a sensitive voltammetric response at the conductive carbon black paste electrode (CCBPE). The redox mechanism was deduced experimentally. The results showed that with the BR buffer at pH 8.0 as the supporting electrolyte, Irreversible oxidation of the transfer process is controlled by adsorption. Under the conditions of enrichment time, enrichment potential, pH and other factors, the peak value of semi-differential pulse voltammetry was linear with the concentration within the range of 0.03-1.30 μmol / L with the detection limit of 10 nmol / L . Based on this, an electrochemical fast detection method of CV was established and applied to the determination of trace CV in freshwater fishery water with an average recovery of 97.1%.