扩散法被动式甲醛个体监测器（Ⅱ型）的研制

介绍了一种基于气体分子扩散原理的被动式甲醛个体采样器，它是在Ⅰ型采样器的基础上完成的。采用甘油（２０％）／偏重亚硫酸钠（０．２５％）浸渍的定量滤纸（φ４２ｍｍ）作为吸收层，空气中甲醛扩散到吸收层上，形成稳定的化合物。采样一定时间后，取出吸收层，洗脱后，用ＡＨＭＴ化学比色法测定所采集到的甲醛。这种采样器的平均采样速率为８３ｍｌ／ｍｉｎ，标准偏差为７．２ｍｌ／ｍｉｎ，与有动力吸收管采样的方法相比较，总不确定度小于±２５％。

Development of a passive personal sampler for monitoring formaldehyde

In this paper, a passive personal Sampler for monitoring HCHO based on the principle of molecular diffusion is introduced.The quantitative filters impregnated with the solution of 20% glycerine and 0.25% Na2S2O5 are used as absorbent layer. Formaldehyde molecules in ambient air diffuse onto the absorbent layer and form chemial compound. After a period of sampling, the AHMT colormetric method can be used to determine the concentration of formaldhyde in the absorbent layer. The average sampling rate is 83 ml/min, with standard deviation 7.2ml/min, compared with the active devices,the relative overall uncertainty of this passive personal sampler less than ±25%.