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１引 言 苯甲酸、山梨酸等是最普遍的防腐剂。对它们的测定相当方便，也有很多方法。而尼泊金系列的防腐剂，如对羟基苯甲酸甲酯、对羟基苯甲酸丙酯，对羟基甲酸丁酯，虽然应用的范围没有苯甲酸、山梨酸那么广泛，但是在某些地方，它们却是不可替代的。因此，准确地测定它们的
1 Introduction Benzoic acid, sorbic acid, etc. are the most common preservatives. The determination of them is very convenient, there are many ways. The preservatives in the paraben series, such as methyl paraben, propyl paraben and butyl paraben, are not as broad in scope as benzoic acid or sorbic acid but in some places they It is irreplaceable. Therefore, they are accurately measured