Chinese Journal of Applied Chemistry ›› 1990, Vol. 0 ›› Issue (3): 82-84.

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DETERMINATION OF FOOD COLOURANT BY ADSORPTIVE STRIPPING VOLTAMMETRY

Wang Lizeng, Li Xiaoqiong, Wen Shiqi, Chen Rongli   

  1. Department of Applied Chemistry, Shandong University, Jinan 250100
  • Received:1989-07-15 Revised:1990-01-16 Published:1990-06-10 Online:1990-06-10

Abstract: Synthetic food colourants-tartrazine and ponceau-4R are found to be adsorbed stronglyon a hanging mercury drop electrode and can thus be determined by linear sweep adsorptionvoltammetry.The peaks of derivative waves can be produced at -0.74V and -0.82V respec-tively for tortrazine and ponceau-4R in a buffer solution of disodium hydrogen phosphate,pH-8.8. The determination limit is of 3.0?10-9mol/L and 2.0?10-9mol/L respectively.The method has been used to the determination of the colourant in food.

Key words: food colourant, adsorptive voltammetry, tartrazine, ponceau-4R