以氯气和氢氧化钠为原料制备次氯酸钠溶液，控制其中游离碱含量在10.8%左右，有效氯在8.0%左右。

Sodium hypochlorite solution has been prepared by chlorine and sodium hydroxide, the content of free alkali should be controlled at about 10.8%, and the effective chlorine at about 8.0%.

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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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[方法]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。

[Methods] 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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