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.
配制完成后使用甲醛吸收-副玫瑰苯胺分光光度法对其进行了多次重复测量，结果表明，测量值与配制值一致。
The solution in ampoules has been measured by formaldehyde absorbing-pararosaniline spectrophotometric method without significant difference between preparing value and measuring value.
提出了在采用国家标准方法采集空气样，以四氯汞钾溶液吸收—盐酸副玫瑰苯胺分光光度法测定空气中SO_2时，由于空气受尘污染，可能导致测定数据偏低。
Using TCM as absorbent, and PRA spectrophotome. try to determine SO_2 in air, due to the air sample was polluted by dust, the SO_2 concentration may be declined.
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