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Development of a Sensitive Lazer Spctrophotometric Environmental Monitoring Device Using Droplet Method

液滴法灵敏激光分光光度环境监测装置的研制

基本信息

批准号：
10650797
负责人：
KORENAGA Takashi
金额：
$ 2.56万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650797/
关键词：
droplet sampling device nitrogen dioxide lazer passive sampler microchip microfabrication サンプリング

项目摘要

We developed and used the passive sampling device to measure NOx in SOx in air pollution. In the present work we have changed the passive sampler method to the droplet method. Because the passive sampler is, however, not fit to the high sensitivity and precise analysis and, therefore, unable to monitor micro-amounts of variable toxic substances in long period exposure.To meet the solution of disadvantage, we adopted the Dasgupta's droplet method. We use the light-emitting diode and the optical fiber to analyze the droplet which used in the experiment is the cylindrical chamber. In the center of the chamber there is a stainless steel tube. It is used to deliver the solution. And the tip of a stainless tube always keeps the droplet dripping. The gas stream is introduced into the cylindrical chamber at the top, from two oppositely located gas inlets, to achieve more symmetric flow profile around the droplet. Then the droplet collects the gas and is changed the color. The light from a high brightness LED illuminates the droplet. On the diametrically opposite side, the transmitted light is conducted by a plastic optical fiber to a photodiode equipped with an interface filter. A reference photodiode is placed at the back plane of the LED to provide a dual-beam referenced detection arrangement. Absorbance is computed as -log[ (Id-Id')/(Ir-lr') ] +Ko where Id and Ir are the respective photocurrents generated by the detector and the reference photodiode, Id' and Ir' are the corresponding dark currents, and Ko is an offset constant that compensates for the inequality between the intensities of the reference beam and the probe beam directed to the drop.Our purpose and goal are the application of the recent micromachining techniques to the droplet method. A microchip of several centimeter square can collect and analyze the gas sample. Also, microfabrication of the droplet method will give the smallest analysis device which can be applicable to various environmental samples.

研制并应用被动式采样装置对大气污染物中的NOx、SOx进行了测定。在目前的工作中，我们已经改变了被动采样器的方法，液滴的方法。由于被动式采样器不适合高灵敏度和高精度的分析，无法对长期接触的微量可变有毒物质进行监测，为解决这一问题，我们采用了Dasgupta液滴法。实验中所用的液滴为圆柱形腔体，采用发光二极管和光纤对液滴进行分析。在腔室的中心有一个不锈钢管。它用于提供解决方案。不锈钢管的尖端总是保持水滴滴落。气流从两个相对定位的气体入口引入顶部的圆柱形腔室中，以实现围绕液滴的更对称的流动轮廓。然后液滴收集气体并改变颜色。来自高亮度LED的光照亮液滴。在直径相对的一侧，传输的光由塑料光纤传导到配备有接口滤波器的光电二极管。参考光电二极管被放置在LED的背板处，以提供双光束参考检测布置。吸光度计算为-log[（Id-Id '）/（Ir-Ir'）] +Ko，其中Id和Ir是由检测器和参考光电二极管产生的相应光电流，Id'和Ir'是相应的暗电流，并且Ko是补偿被引导到液滴的参考光束和探测光束的强度之间的不平等的偏移常数。微加工技术的液滴方法。一个几厘米见方的微型芯片可以收集和分析气体样品。此外，微滴法的微制造将给出可适用于各种环境样品的最小分析装置。