一個多頻道PM10-PM2.5採樣器的研發

Abstract

目前台灣地區所用的採樣儀器絕大都是進口的產品，很少有本土自產的儀器，這些 採樣器所費不貲，因此國人自行研發微粒採樣器有很大的需要。本計畫擬以三年的時間, 設計並測試一個多頻道的PM10-PM2.5 採樣器, 可以同時採集4 個PM10 及4 個PM2.5 的濾 紙或固氣分離器(denuder)的樣本, 以供微粒稱重、元素分析、離子分析及碳分析，或正 確的無機或有機氣體及微粒分析之用，避免因樣品不足需要切割濾紙造成濃度不均，或 是需要使用多個微粒採樣器、花費成本過高的問題。本採樣器的另一個特點是採樣氣體 體積流率採主動式的控制方式，可以依大氣的溫度、壓力及濾紙的壓差而維持一個固定 值，以便能得到正確的PM10 及PM2.5 的樣本，同時可以紀錄逐時的採樣體積流率、大氣 的溫度及壓力，以用於計算正確的大氣微粒濃度。本計畫擬在實驗室及風洞中完成校正 測試工作, 並與巿售的PM 採樣器完成現場比對測試工作, 以驗證本採樣器的準確性, 並進一步改善本採樣器以增進其實用性。

Currently most of the air sampling instruments used in Taiwan are imported from abroad. There are very few domestic instruments. These instruments are costly and hence there is a big demand to develop domestic particle samplers. This proposal intends to use 3 years to design and test a multi-channel PM10-PM2.5 sampler in which 4 PM10 and four PM2.5 filter or denuder samples can be taken at the same time. These samples can further be used for weighing, and analysis for elements, ions and carbons, or accurate inorganic or organic gas and particle analysis. This is to avoid the need to divide the filter samples when the samples are not adequate which may result in non-uniform concentration, or the need to use many particle samplers which are costly. The other advantage of this sampler is that the volumetric flow rate is controlled actively so that a fixed flow rate can be maintained based on atmospheric temperature, pressure and filter pressure drop so that accurate PM10-PM2.5 samples can be obtained. Also the hourly sampling volumetric flow rate, ambient temperature and pressure can be recorded for further calculation of ambient PM concentration. This proposal will conduct the calibration test in the laboratory and a wind tunnel, and finish comparison with other commercial samplers at field to validate the accuracy of the sampler. This is to further improve the sampler and increase its feasibility.