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测定植物油的酸价和过氧化值是检验油脂是否变质的重要指标之一。油脂的酸价高,表明该品游离脂肪酸多,过氧化值高则表示油脂酸败。新鲜油的酸价低、过氧化值在0.03％以下。国家标准局1982年颁发的《中华人民共和国食品卫生标准》中明确规定食用植物油酸价不得超过4,过氧化值不得超过0.15％。其检验方法规定采用常规滴定法,但用规定方法测定植物油的酸价和过氧化值需以酚酞和淀粉作指示剂,由于植物油本身略带黄色,指示终点颜色不易辨明,误差较大,所需时间。较长我们试用ZD-2型自动电位滴定计对植物油的酸价和
Determining the acid value and peroxide value of vegetable oil is one of the most important indexes to test whether the oil deteriorates. The high acid value of the oil, indicating that the goods more free fatty acids, peroxide value is high that rancid. Low acid value of fresh oil, peroxide value of 0.03% or less. National Bureau of Standards issued in 1982, “People’s Republic of China Food Hygiene Standards” clearly provides edible vegetable oil acid value shall not exceed 4, peroxide value shall not exceed 0.15%. The test method requires the use of conventional titration, but the use of the provisions of the determination of vegetable oil acid value and peroxide value phenolphthalein and starch to be used as an indicator, because the vegetable oil itself slightly yellow, indicating the endpoint color is not easy to identify, the error is large, the required time. Longer We try ZD-2 automatic potentiometric titration of vegetable oil acid value and