This test is a measure of the unsaturated linkages in a fat and is determined by reacting the fat with a solution of iodine monochloride in a mixture of acetic acid and CCU, liberating excess iodine with KI, and titrating with Na2S203 (Wijs method).

• 这个试验是不饱和键的测量,它由脂肪与一氯化碘在乙酸与CCU的混合物的溶液反应进行测量,用ki除多余的碘,用硫代硫酸钠滴定(威杰斯法)。