Abstract: A new analytical method with nitrogen-benzene floatation ternary complex spectrophotometry for determination of VC was developed. Its principle is that I3-can react with malachite green to form ternary complex, which is insoluble and instable in water, but can be dissolved steadily in organic solvent. The method exhibits high sensitivity (ε= 5.02×105 L/mol·cm) and good selectivity and excellent accuracy (RSD=3.4 %, n=10, m=10μg). It can be used to determine of VC in food (vegetable) with satisfactoryr esult.

Key words: N₂, benzene, floatation, ternary complex, indirect spectrophotometry, VC, food