In this paper a potentiometric titration was used to improve the neutral sodium sulfite method for determining the content of formaldehyde, and the accuracy and influential factors were discussed.
采用电位滴定法改进了测定甲醛含量的中性亚硫酸钠法，并对其准确度和影响因素进行了探讨。
The preparation of gelatin hydrolyzed with AS1. 398 neutral protease at different temperatures. The hydrolysis degree was tested by means of formaldehyde titration.
在不同的温度下，用as1.398中性蛋白酶制备水解明胶，甲醛滴定法测定明胶的水解程度。
The direct titration of pyridine with aqueous standard solution of hydrochloric acid in the presence of concentrated neutral salts have been studied.
本文对浓中性盐存在时，用盐酸标准溶液直接滴定吡啶进行了研究。
The direct titration of pyridine with aqueous standard solution of hydrochloric acid in the presence of concentrated neutral salts have been studied.
本文对浓中性盐存在时，用盐酸标准溶液直接滴定吡啶进行了研究。
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