发现了用PVB甲醇溶液测定冻胶化温度较乙醇溶液更灵敏。
To use PVB methanol solution to test its gelling temperature is more sensitive than to use PVB ethanol solution.
加入标准溶液测定方法的回收率，消解条件对测定结果有影响。
Adding standard solution in the samples, the recovery ratio is determined.
以百里酚兰为指示剂，用氢氧化钠标准滴定溶液测定植物油中游离脂肪酸。
To determine the free fatty ac id in vegetable oil with NaOH's standard titration solution, using Thymol Blue as its indicator.
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