摘要
甲醛法测定铵盐中的氮,由于在同一溶液中,实际使用了甲基红和酚酞两种指示剂,在以NaOH为标准溶液的滴定过程中,应注意溶液中的两种指示剂颜色的变化过程,当溶液呈现微橙红色并保持30s不褪色才为滴定终点。
Two types of indicatiors of methyl red and phenolphthalein had been used actually in the same Solution when we measured nitrogen in the ammonium Sale Solution. By formaldehyde method. During the course of tieraction based the standard sodium-hydroxide solution, the variable process of colour of two indicators should be paid attention to. It's titration end-point when the colour of the solution appeared light orange-red and didn't fad in thirty seconds.
出处
《天津化工》
CAS
2004年第6期55-56,共2页
Tianjin Chemical Industry
关键词
甲醛法
铵盐
滴定终点
微橙红色
Formaldehyde method
ammonium Salt
titration end-point
light orange-red.
