用固体石蜡山梨酸碳糊电极电位法测定食品中山梨酸

Potentiometric Determination of Sorbic Acid with Solid Paraffin Sorbic Acid Modified Carbon Paste Electrode

摘要: 制备了一种以山梨酸根与乙基紫形成的缔合物为电活性物的固体石蜡山梨酸碳糊电极,并对其性能做了测定。结果显示该电极对山梨酸有较好的能斯特响应。山梨酸的线性范围为2.2×10-5~1.0×10-1mol·L-1,检出限为1.6×10-5mol·L-1。该电极用于食品中山梨酸根的测定,结果与分光光度法结果相符。

Abstract: Solid paraffin sorbic acid modified carbon paste electrode based on the complex of ethyl violet with sorbic acid as electroactive material was prepared and its electrochemical properties were studied. Good response of this ion selective electrode against sorbic acid was obtained giving linearity range from 2.2×10-5 to 1.0×10-1mol·L-1, with detection limit of 1.6×10-5mol·L-1. The modified electrode was used in the potentiometric determination of sorbic acid in food, and results obtained were found to be checked quite well with those obtained by spectrophotometry.