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。虽然各种分析仪器已用于空气污染气体的测量，但不方便现场分析。因为分析仪器价格昂贵，而且需要设置在实验室。因此，需要简单方便的设备来测量空气污染气体。在本研究中，我们开发了“微型扩散洗涤器”，其尺寸变得更加紧凑。该装置结构非常简单，为双管，并且可以有效地仅收集气体。该装置的内管采用PPTFE（多孔聚四氟乙烯）管，外管采用聚碳酸酯管。微型扩散洗涤器可将污染气体收集到仅1ml的捕集溶液中。因此，采用LED-PM（发光二极管光度计）比色法无需浓缩过程即可测定这些气体。通过该设备和常规方法实际测量了环境空气中甲醛和二氧化氮的浓度。两种方法的测量值之间表现出良好的一致性。接下来，我们开发了一种新型的空气污染气体自动连续测量系统。该系统由微型扩散洗涤器和 LED-PM 组成。将捕获溶液送入 PPTFE 管中，并将空气吸入 PPTFE 管和玻璃管之间的环形空间中。 PPTFE 管还充当吸收池。洗涤器内捕获溶液的吸光度可以与空气采样同时测量。光源的 LED 还可以用作波长选择性光电探测器。我们将使用该设备测量的环境空气中的二氧化氮和氧化剂浓度与传统方法测量的浓度进行了比较。同一时期，两种方法测量的环境空气中二氧化氮和氧化剂的浓度分别表现出良好的一致性。