制作过程中加入吊白块，用酸碱滴定法分别测定水豆腐压滤液、离浆液和蒸馏液中甲醛含量。

The formaldehyde contents in tofu filtrate, liquid separated from beancurd and the distillate of beancurd were measured by acid-base titration.

youdao

研究了用气提滴定法测定植物中氮的条件和方法。实验结果表明，与蒸馏法相比，方法简便安全，结果准确。

The method, especially the conditions of determining nitrogen in plant, is studied. The results obtained show that compared with distillating method, it is simple, safe and accurate.

youdao