扩散法测定沈阳市环境空气中的二氧化氮

被动式个体采样器（passive personal sampler）是基于气体分子扩散或渗透原理,采集空气中气态或蒸汽态污染物的一种采样方法,它不使用任何电源和抽气动力,是一种无泵采样器,可连续采样,并可作为环境空气质量评价的监测。国内外开展室内被动式扩散采样器的研究和应用的文章很多,并逐步应用于室内环境空气的监测方面,特别是对人体健康的影响评价。但是,在使用中要特别注意风速对气体污染物的采样速率的影响,为此文章介绍了利用中国预防医学科学院环境卫生监测所研制的室内分子扩散采样器1],并自制挡风筒,使分子扩散采样器暴露在一个恒定的风速环境中,排除风速对采样速率的影响,应用于室外环境监测沈阳市环境空气中的二氧化氮的方法。经实验室性能评价能够满足实验室测试的要求,并经有动力的溶液吸收管法现场对比测试,两种测试结果一致。为室外环境监测二氧化氮提供了一个经济、准确,有实用价值的采样方法。

Measurement of HO2 in Ambient Air by Passive Sampler

Based on the principle of molecular diffusion or permeation, passive personal sampler （a kind of sampler without pump） may sample continuously the gaseous or vaporous pollutants in the air and serve as a measure to monitor ambient air. However, in application, particular attention should be given to the influence of wind speed on sampling speed rate of gaseous pollutants. This paper introduces the method of measuring HO2 in ambient air by indoor molecule diffusion sampler plus a serf - made wind shield tube which may eliminate the influence of wind speed. The test result shows it is an economical, accurate and practical sampling method.