Single-scanning Oscillo-polarographic Determination of the Banned Pigment-Sudan Red Ⅰ in Foodstuffs

In a borate buffer medium of pH 10,a sensitive adsorptio-reductive polarographic wave was produced by sudan red Ⅰ with its peak potential at -0.95 V (vs.SCE).Linear relationship between values of 1st derivative of peak current (I′p) and concentration of sudan red Ⅰ was obtained in the range from 0.1-2.0 mg·L-1,with its detection limit of 0.01 mg·L-1.Samples of chilli pickle and fermented bean curd were analyzed by the proposed method and no sudan red Ⅰ was found in the samples.Recovery test was made by adding standard sudan red Ⅰ solution to the samples mentioned above,and values of recovery obtained were in the range of 95.3%-103.0%.