Development of droplet surface applied passive monitoring device for low concentration VOC

液滴表面应用的低浓度VOC被动监测装置研制

基本信息

批准号：
10558085
负责人：
KORENAGA Takashi
金额：
$ 6.14万
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 (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

We developed the new environmental monitoring instrument of high performance passive sampling by the droplet method based on the research reports given by Dasgupta, et al. We also improved the instrument for producing large droplets. The pumping method of gas-absorbed solution needed high accuracy at very low flow rates for absorption on a flow droplet surface. We used a plunger pump for the absorbed solution and made the stable continuous flow.On the basic experiment for volatile organic compounds (VOC), especially HCHO, passive sampling instruments, constructed instruments were carried out in the same wind tunnel experiment for nitrogen dioxide, and optimized for sampling conditions, for example, a HCHO-absorbed solution flow rate, droplet diameter, temperature, moisture, wind velocity, and so on.A new, simple, sensitive and in-field fluorimetric method for the determination of formaldehyde is proposed. The reaction of formaldehyde with hydralazine in acidic medium, heating on a boiling water-bath for 25 min, produces s-triazolo [3,4-α] phthalazine (Tri-P). the fluorescence intensity of the product formed (Tei-P) was determined at λ em=389 nm with λ ex=236 nm. The fluorescence intensity is linear over a formaldehyde concentration range of 1.2-33.0 μ gl-1. The proposed method was applied successfully to the determination of formaldehyde sampled from the atmosphere using the liquid droplet technique. Formaldehyde vapor in a wind tunnel and that in the droplet. The detection limit for formaldehyde was 2.0 μ gl-1 with RSDs varying from 3 to 12% in ambient air, using a droplet correction solution (boric acid and hydralazine). The effect of interfering substances on the determination shows that most cations and anions did not interfere. The results obtained were satisfactory compared with a reference method.

我们根据Dasgupta等人提供的研究报告开发了通过液滴方法进行高性能被动采样的新的环境监测工具。我们还改进了生产大液滴的仪器。气体吸收溶液的泵送方法在非常低的流速下需要高精度才能在流液滴表面上抽象。 We used a plumper pump for the absorbed solution and made the stable continuous flow.On the basic experiment for volatile organic Compounds (VOC), especially HCHO, passive sampling instruments, constructed instruments were carried out in the same wind tunnel experiment for nitrogen dioxide, and optimized for sampling conditions, for example, a HCHO-absorbed solution flow rate, droplet diameter, temperature, moisture, wind提出了一种新的，简单，敏感和场地荧光法以测定甲醛的速度。甲醛与水力嗪在酸性培养基中的反应，在沸水浴中加热25分钟，产生了S-Triazolo [3,4-α]苯吡嗪（TRI-P）。用λEM= 389 nm确定形成的产物（TEI-P）的荧光强度，λEX= 236 nm。所提出的方法成功地应用于使用液滴技术从大气中采样的甲醛。甲醛蒸气在风洞中，在液滴中。甲醛的检测极限为2.0μgl-1，RSD使用液滴校正溶液（硼酸和氢化嗪），在环境空气中的检测限为3％至12％。干扰物质对确定的影响表明大多数阳离子和阴离子都不会干扰。与参考方法相比，获得的结果是满足的。