【摘要】 利用吸附法将苏丹红Ⅰ固定在碳纳米管修饰的玻碳电极(CNT)表面,制成稳定的固载苏丹红Ⅰ碳纳米管修饰电极,再利用循环伏安法(CV)、线性扫描伏安法(LSV)研究了苏丹红Ⅰ在CNT上的电化学行为。在pH=2.0的乙醇-B-R缓冲溶液中,苏丹红Ⅰ在-0.16V附近产生一灵敏的还原峰。在优化的最佳实验条件下,溶液中苏丹红Ⅰ峰电流iP与其浓度在8.0×10-7至1.6×10-5mol/L范围内有良好的线性关系,回归方程为iP=2.939+9.963c(×10-6mol/L),R=0.9963。检出限为9.0×10-8mol/L。CNT电极无毒、无污染,灵敏度高,为检测苏丹红Ⅰ提供了一种安全有效的新方法。更多还原

【Abstract】 MWCNT was used as a new sorbent for solid-phase extraction(SPE)of Sudan I.A combination of SPE with linear sweep voltammetric(LSV)analysis resulted in a fast,sensitive,and selective electrochemical method for the determination of Sudan I.Because of the strong affinity of MWCNT for(polynuclear)aromatic compounds,Sudan I can strongly bind to the MWCNT surface.The stripping response was highly linear over the Sudan I concentration range of 8.0×10-7~1.6×10-5 mol/L,with a detection limit of 9.0×10-8 mol/L.The determination of Sudan I in ketchup samples showed acceptable accuracy.The fast extraction ability of MWCNT makes it promising sorbent for solid-phase extractions of Sudan I.更多还原