The chromatropic acid and magenta sulphurous acid methods for the formaldehyde determined by spectrophotometry are studied in this paper, and the two methods are compared.
本文研究了分光光度法测定甲醛中的变色酸法和品红亚硫酸法，同时对这两种方法进行了比较。
2
Methods The content of formaldehyde in rongalite was determined by sulfurous acid, magenta and acetylacetone spectrophotometry respectively.
方法采用品红亚硫酸法和乙酰丙酮法测定吊白块中甲醛含量，并计算样品中吊白块的含量。
3
It is produced by the reduction of fuchsin by sulfurous acid, and is oxidized by aldehydes and ketones, restoring the magenta color of the fuchsin.