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Development of a Passive Sampling/Monitoring Device Suitable for Acid Gas in Atmospheric Environment in China and Its Field Evaluation

适用于我国大气环境酸性气体被动采样/监测装置的研制及现场评价

基本信息

批准号：
09041126
负责人：
KORENAGA Takashi
金额：
$ 9.34万
依托单位：
University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

A new type of passive sampler, which can easily determine sulfur dioxide (SOィイD22ィエD2) and nitrogen dioxide (NOィイD22ィエD2) simultaneously air, has developed. The passive sampling method for analysis of SOィイD22ィエD2 has more difficult than NOィイD22ィエD2 chiefly because of following two problems. The first one is that SOィイD22ィエD2 has high absorptivity. Therefore, it is much absorbed in the materials used as the absorption and diffusion filter in sampler, and the second one is that the sulfate ion, to which absorbed SOィイD22ィエD2 is oxidized, is usually contained in filter used as sampler parts. Thus, blank concentration of sulfur ion is sampler is higher. As a result of exposure experiments using a wind tunnel to evaluate the materials used as absorption and diffusion filter, the passive sampler which polyethelene membrane is used as an absorption layer, and polyethylene and polypropylene as the first and second diffusion layer was found to have the most suitable sampler for analyzing SOィイD22ィエD2 and NOィイD22ィエD2. The precision and detection limit of this method was found to be satisfactory. The method established in this study has been applied to the evaluation of air quality at the five major cities in China since September 1997.The passive samplers are easily influence by wind. However, the newly developed samplers are found to have minimum influence by sampling conditions such as wind, humidity and temperature. So this method is applied to investigate the air in six cities, Beijing, Lonzhou, Wuhan, Dalian, Shenyang which are high in China. The concentrations of SOィイD22ィエD2 and NOィイD22ィエD2 are two days averages. These obtained data has good agreement with the annual average concentration. The weekly change of SOィイD22ィエD2 and NOィイD22ィエD2 concentration (7 days average) in Beijing. Since temperature dropped, SOィイD22ィエD2 and NOィイD22ィエD2 concentrations tend to increase. One of the causes of it is the increase of using coal for heating.

研制了一种能同时测定空气中二氧化硫（SO_22）和二氧化氮（NO_2 ~ 2 ~ 2）的被动采样器。被动取样法分析SO_（22）O_（22）第一个是SO ↓ [2] D ↓ [22] O ↓ [2]具有高吸收率。因此，它在采样器中用作吸收和扩散过滤器的材料中被大量吸收;第二个原因是，被吸收的SO_（2-）D_2 ~（2-）D_2被氧化成的硫酸根离子通常包含在用作采样器部件的过滤器中。因此，采样器中硫离子的空白浓度较高。通过风洞暴露试验，对吸收扩散过滤材料进行了评价，结果表明，以聚乙烯膜为吸收层，聚乙烯和聚丙烯为第一、第二扩散层的被动式采样器是分析SO_（22）O_该方法的精密度和检出限令人满意。自1997年9月以来，本研究建立的方法已应用于中国五个主要城市的空气质量评价。然而，新开发的采样器被发现有最小的影响，采样条件，如风，湿度和温度。应用该方法对北京、武汉、大连、沈阳、龙州等六个高污染城市的空气进行了调查。SO_（22）O_（2这些数据与年平均浓度有很好的一致性。北京市SO_（22）O_随着气温的下降，SO_（22）O_（22原因之一是取暖用煤的增加。