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经过比较,作者认为大气中甲醛的测定,以3-甲基-2-苯并噻唑腙(3-Methyl-2-benzothiazolone hydrazone简称MBTH)法灵敏度最高,操作简便。通过实验认为NO_2对本法无干扰,而SO_2共存时,使测定结果偏低。因此,对SO_2干扰的消除方法进行了探讨。SO_2有较强的吸附性,通过滤纸即可被吸附一部分。利用此特性,在玻璃纤维滤纸上滴加各种金属盐类溶液作为氧化
After comparison, the author thinks that the determination of formaldehyde in the atmosphere has the highest sensitivity with 3-Methyl-2-benzothiazolone hydrazone (MBTH) method and is easy to operate. Through the experiment that no NO_2 interference with the law, and SO_2 coexist, so that the determination of low. Therefore, the elimination of SO 2 interference is discussed. SO_2 has a strong adsorption, through the filter paper can be adsorbed part. With this property, various metal salt solutions are dropped on the glass fiber filter paper for oxidation