油脂溶点即油脂由固态溶化成液态的温度,也就是固态和液态的蒸汽压相等的温度。
(一) 仪器和用具
毛细玻管:内径1mm, 外径最大为2mm,长度80mm, 水银温度计:100℃,1/10℃刻度;冰箱、恒温烘箱、电炉、恒温水浴锅;烧杯:500ml;酒精喷灯、锥形瓶、漏斗、滤纸等。
(二) 操作方法
1.样品处理:将样品过滤、烘干。取洁净干燥的毛细玻管3只,分别吸取试样达10mm高度,用喷灯火焰将吸取试样的管端封闭,然后放入烧杯中,置4~10℃的冰箱中过夜,到时取出用橡皮筋将3只管扎紧在温度计上,使试样与水银球相平。
2. 加温:在500ml烧杯中,先注入半杯水,悬挂1只温度计,然后将试样管和温度计也悬挂在杯内的水中,使水银球浸入水中30mm处。置于水浴中开始加热。开始温度要低于试样溶点8~10℃,同时搅动杯中水,使水温上升的速度为每分钟约0.5℃.
(三) 测定结果
试样在溶化前常发生软化状态,继续加热直至玻管内的试样完全变成透明的液体为止,立即读取当时的温度,即为油脂的溶点。双试验结果允许差不超过0.5℃,取其平均值作为测定结果。测定结果取小数点后第一位。
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