盐酸副玫瑰苯胺法测定空气中甲醛，使用了有毒的汞试剂，为此对该法进行了改进。
The method is improved for measuring formaldehyde in air by the method of pararosaniline hydrochloride using toxic mercury reagent.
盐酸副玫瑰苯胺法测定空气中甲醛，使用了有毒的汞试剂，为此对该法进行了改进。
The method is improved for measuring formaldehyde in air by the method of pararosaniline hydrochloride using toxic mercury reagent.
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