被动采样法测定室内空气环境中的二氧化氮

Passive sampling method to determine nitrogen dioxide of indoor environment

用基于气体分子扩散理论研制的被动采样器 (Passivesampler) ,结合Saltzman法 ,离子色谱法 (IC)分析、测定室内空气环境中的NO2 ,利用风洞实验装置进行模拟曝露实验 ,着重研究捕集液的种类、浓度和风洞内NO2 初始浓度、湿度对捕集NO2 能力的影响以及采样器的材料、结构与采样性能的关系。结果表明 ,本文研制的采样器在空气中曝露数个小时后 ,测定空气中NO2 浓度可达n×1 0 μg/L ,与用NOx 分析仪直接测定结果比较误差在 2 0 %以内。本采样器体积小、质量小、结构简单 ,不仅适用于生活环境中NO2 的测定 ,也适用于NO2

A passive sampler based on a gas molecular diffusion theory, combining with the Saltzman method and ion chromatography, was used to determine the nitrogen dioxide (NO 2) of indoor environment. Exposur experiment mas made by a wind tunnel setup. The influence of catch solution, humidity and initial concentration of NO 2 within wind tunnel upon catching ability, the relationship of sampling ability with the material and structure of the sampler. The passive sampler could determine nitrogen dioxide at the several ten μg/L by exposure of hours, and the error was within 20%. It could be applied not only to determine the nitrogen dioxide of the environment but also to determine the nitrogen dioxide exposure dose of the subject person.