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一、原理:利用植物油经皂化反应后溶液呈透明状态,而矿物油(机油)不参与皂化反应而使溶液浑浊从而鉴别之。二、试剂:乙醚。氢氧化钠乙醇溶液:取氢氧化钠2克,加少量蒸馏水至刚好全部溶解后,加入95%乙醇150毫升,摇匀。机油标准溶液:精密称取机油0.200克(最好取较纯的真空油)溶于乙醚中,倒入100毫升容量瓶中,用乙醚稀释到刻度,即成2毫克/毫升的机油标液贮备液。吸取机油标准贮备液10毫升,于100毫升容量瓶中,用乙醚稀释至刻度,即成0.2毫克/毫
First, the principle: The use of vegetable oil saponification reaction was transparent solution, and mineral oil (oil) does not participate in the saponification reaction to make the solution turbid to identify it. Second, reagents: ether. Sodium hydroxide ethanol solution: Take 2 grams of sodium hydroxide, add a small amount of distilled water to just dissolve, add 95% ethanol 150 ml, shake. Oil standard solution: Precision weighed 0.200 grams of oil (preferably pure vacuum oil) dissolved in ether, into 100 ml volumetric flask, dilute to the mark with diethyl ether, which became 2 mg / ml of oil standard solution reserve liquid. Draw 10 ml oil standard stock solution, in 100 ml volumetric flask, diluted to the mark with diethyl ether, that is 0.2 mg / milliliter