扩散法被动式二氧化氮个体监测器的研制

研制了一种应用分子扩散法原理测量ＮＯ２的个体监测器。用三乙醇胺浸渍的滤纸作为ＮＯ２吸收介质，采样后用Ｓａｌｔｚｍａｎ比色法分析。采样器在温度－１０～３５℃，风速２０～２５０ｃｍ／ｓ，相对温度１０％～８０％的范围内使用，采样速度单面为７４ｍｌ／ｍｉｎ；把壳体改进为双面暴露的采样，采样速度为１５０ｍｌ／ｍｉｎ，相对标准差为１０％。与有泵的采样方法（溶液吸收管和化学发光仪器）相比较，总准确度为±２２％。与日本同类产品相比较，测定结果是一致的。本监测器最小可测浓度为０．０１３ｍｇ／ｍ３（２４ｈ采样），可广泛应用于室内空气污染和个体接触量的监测。

A passive personal monitor for nitrogen dioxide by molecular diffusion

The paper presents a passive personal monitor for nitrogen dioxide by molecular diffusion. The absorbent sheet made from a filter paper impregnated with triethanolamine solution and NO2 concentration was analyzed by the modified Saltzman method. Sampling rate of single side monitorwas 74ml/min and that of double-side monitor was 150ml/min by adding a diffusive layer. When temperature was -10℃～35℃, wind velocity was 20cm/s～250cm/s,relative humility was 10%～80%,relative standard deviation of sampling rate was 10%. Compared with conventional pump-drived samplers(bubble sampler and chemiluminescense analyzer)in field,the relative overall uncertainty of NO2 personal monitor was ±22%,Both results were agreed well with the similar type monitors(Japan). The qualitative detection limit of the personal monitor was 0.013mg/m3(24hrs exposure).It can be widely used in studying on indoor air pollution and personal exposure monitoring.