摘要
本文介绍了一种新型的大气细粒子快速捕集及其化学成分在线分析方法。该方法中大气细粒子与过饱和水蒸气绝热混和而增长成大粒子 ,并在气流的带动下惯性撞击到一垂直玻璃板上 ,一含有内标物的去离子水流自上而下将撞击到玻璃板上的粒子收集 ,收集液被直接输送到离子色谱、总有机碳分析仪 ,在线分析其中的化学成分。该方法每 12min可完成单个样品分析 ,每小时可连续采集分析 5个样品。离子色谱最低检测限约为 0 .0 5 μg/m3(NH+4 )到 0 .2 0 μg/m3(SO2 -4 ) ,不确定度约为 3 % ,TOC最低检测限为 5× 10 -5μg/m3,不确定度约为 3 %。真实的大气细粒子观测结果表明 ,该方法快速、简捷、灵敏度高 。
We present a new approach for rapid collection of fine particles and on-line measurement of chemical composition. The approach is based on fine particle collection instrument in which the droplets are formed and grow rapidly, then impinge onto a flat vertical glass plate by inertia and are collected in water solution containing LiF standard. The resulting liquid is conducted to a dual channel ion chromatograph (1C) or a total organic carbon analyzer (TOC) to on-line analyze its chemical composition. Only 12 minutes it takes to measure a sample by IC or TOC. The detection limit is from 0.05μg/m 3(NH + 4 ) to 0.20μg/m 3(SO 2- 4) for IC and 5×10 -5μg/m 3 for TOC. Measurement uncertainty is 3% or so for inorganic ion and TOC. Results obtained in observation show that the approach is rapid, simple, high-sensitive and it is a very useful tool for rapid measurement of atmospheric fine particles chemical composition.
出处
《环境污染治理技术与设备》
CSCD
北大核心
2002年第11期10-14,共5页
Techniques and Equipment for Environmental Pollution Control
基金
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