酞菁钴修饰碳糊电极对微量苯酚的测定

Determination of phenol on a carbon paste electrode modified with cobalt phthalocyanine

研究了苯酚在酞菁钴修饰碳糊电极上的电化学行为，提出了催化反应的机理，并以此为依据，用伏安法以酞菁钴修饰碳糊电极为工作电极测定了微量苯酚。在pH8．7的磷酸盐缓冲溶液（PBS）中，苯酚在0．61V（对SEE）出现一氧化峰，该峰电流与苯酚的浓度在5．0×10^-7～1．0×10^-4mol／L之间呈线性关系，检出限为1．0×10^-7mol／L。此法可用于工业废水中苯酚的测定。

Electrochemistry of phenol on the carbon paste electrode modified with cobalt phthalocyanine （CoPc-CPE） is studied and the catalytic mechanism is proposed. CoPc-CPE shows good electrocatalytic activity for the oxidation of phenol. In phosphorate buffer solution with pH 8.7, the oxidation peak of phenol is observed at about 0.61 V （ vs. SCE） on the CoPc-CPE. The relationship between the oxidation peak current and phenol concentration is linear in the range of 5.0×10^-7 to1.0×10^-4mol/L and the detection limit for phenol is 1.0×10^-7 mol/L. This method can be applied to determining phenol in waste water .