Linear Scanning Voltammetric Determination of Sudan Ⅰ in Chilli Products

In a buffer medium of saturated borax solution (pH 9.2) acting as supponting electrolyte and using acetone as solvent for samples of chilli products, a reductive wave giving by the electro active -C=C- and -N=N- groups in the molecule of Sudan Ⅰ was observed at the hanging mercury drop electrode which is the working electrode of the 3-electrode system, with SCE as reference electrode and micro-Pt electrode as counter electrode, at the potential of -1 050 mV. Linear relationship between values of reductive peak current ip and mass concentration of Sudan Ⅰ was obtained in the range of 0.1-1.4 mg·L-1, and detection limit (3s/k) was found as 9.8 μg·L-1. Based on these facts, a linear scanning voltammetric determination of Sudan Ⅰ in chill products was proposed. Using samples of chilli sauce as matrixes recovery was tested by standard addition method, giving results of recovery in the range of 88.0%-98.4%. Values of RSD′s (n=5) calculated from the determined results were in the range of 0.72%-5.4%.