Development of Automated and Continuous Measurement Equipment for Air Pollution Gases by Using Miniature Diffusion Scrubber and LED Photometer

利用微型扩散洗涤器和LED光度计开发空气污染气体自动连续测量设备

基本信息

批准号：
16310013
负责人：
TANAKA Shigeru
金额：
$ 10.18万
依托单位：
KEIO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

In recent years, air environment pollution has become a big problem. While various analytical instruments have been used for the measurement of air pollution gases, but it is not convenient for the on-site analysis. Because analytical instruments are expensive and need to be set in a laboratory. Therefore, the simple and convenient equipment is required for measuring air pollution gases.In this study, we developed "miniature diffusion scrubber", which became more compact in size. This devise is very simple structure as a double tube, and it can efficiently collect only gases. This device uses PPTFE (porous poly tetra fluoro ethylene) tube for the inside tube and a poly-carbonate tube for the outside tube. The miniature diffusion scrubber can collect pollution gases into only 1ml of trapping solution. Therefore, colorimetric method with LED-PM (Light Emitting Diode-Photometer) can determined these gases without a concentration process.The concentration of formaldehyde and nitrogen dioxide in ambient air were actually measured by this equipment and the conventional method. It showed a good agreement between the measured values by both methods.Next, we developed a new automated continuous measurement system of air pollution gases. This system consists of the miniature diffusion scrubber and LED-PM. A trapping solution feeds into the PPTFE tube and an air is drawn into the annular space between the PPTFE tube and the glass tube. The PPTFE tube also acts as an absorption cell. The absorbance of trapping solution inside the scrubber can be measured in parallel with air sampling. The LED for the light source can also work as a wavelength selective photodetector.We compared nitrogen dioxide and oxidants concentrations in ambient air measured by this equipment with those measured by conventional methods. The concentrations of nitrogen dioxide and oxidants in ambient air measured by both methods showed a good agreement, respectively, during the same period.

近年来，空气环境污染已成为一个大问题。尽管已使用各种分析仪器来测量空气污染气体，但对于现场分析并不方便。因为分析仪器很昂贵，需要设置在实验室中。因此，测量空气污染气体需要简单便捷的设备。在这项研究中，我们开发了“微型扩散洗涤器”，该研究的尺寸变得更加紧凑。这种设计是一个非常简单的结构，作为双管，它可以有效收集气体。该设备使用PPTFE（多孔聚二氟乙烯）管进行内管，并用于外管的聚碳酸盐管。微型扩散洗涤器只能将污染气体收集到1ML的捕获溶液中。因此，使用LED-PM（发光二极管光度计）可以确定这些气体而无需浓度过程。甲醛和二氧化氮在环境空气中的浓度实际上是通过该设备和常规方法测量了环境空气中的。它通过两种方法显示了测量值之间的良好一致性。接下来，我们开发了一种新的自动连续测量空气污染气体。该系统由微型扩散洗涤器和LED-PM组成。诱捕溶液进食到PPTFE管中，并将空气吸入PPTFE管和玻璃管之间的环形空间中。 PPTFE管也充当吸收细胞。洗涤器内部捕获溶液的吸光度可以与空气采样并行测量。光源的LED也可以用作波长选择性光电探测器。我们比较了该设备测量的环境空气中的二氧化氮和氧化剂浓度与通过常规方法测量的氮。两种方法测得的环境空气中二氧化氮和氧化剂的浓度分别在同一时期均显示出良好的一致性。