環境中奈米物質量測及特性分析技術開發

Abstract

本期研究將以改良的採樣方法並結合過去五年的計畫執行經驗，在新莊、中山及竹東三個空氣品質監測站(air quality monitoring stations, AQMS)進行採樣，採樣結果也將與AQMS的各種氣象及汙染物的監測值進行比對分析。濾紙樣本中微粒的水溶性離子成分將由本研究以IC進行分析，金屬成分則由本計畫合作單位中央研究院環境變遷中心利用ICP-MS方法分進行析。本研究也將利用正矩陣因子法(Positive Matrix Factorization model , PMF)推估微粒的來源。此外，本研究也會探討不同濕度及微粒負荷量對WINS衝擊器及VSCC旋風器分徑效果造成的影響，以找出最適合國內的粒徑篩分裝置。 為了篩選出國內最適合的奈米微粒數目濃度與細微粒質量濃度即時量測技術，本研究將分別針對掃描式微粒電移動度分析儀(Scanning Mobility Particle Sizer, SMPS)及濾紙動態量測系統(Filter Dynamic Measurement System, FDMS)的量測結果進行評估。關於SMPS，本研究將針對其對於不規則形狀微粒的量測結果作探討，FDMS方面則會以環檢所公告之標準手動採樣方法和其測值進行比對。

This year, the present study will use the modified sampling method and incorporate with the experience from previous projects to conduct the ambient aerosol samplings at Xinzhuang, Zhongshan and Zhudong air quality monitoring stations (AQMS). For further understanding of the interaction between different pollutants and meteorological variables, the sampling results will compare with the real-time meteorological and pollution data obtained from the AQMS. All particle samples will be analyzed for water-soluble compounds using the Ion Chromatography (IC), and will be also distributed to Dr. Shiu of Research Center of Environmental Changes to conduct the metal analysis by using the LA-ICP-MS or ICP-MS. Finally, the Positive Matrix Factorization model (PMF) will be utilized to predict the particulate sources. Beside the sampling work, the effects of ambient relative humidity and loaded mass on the cutoff characteristics of WINS and VSCC will also be evaluated hoping to find out a size-selective inlet which is suitable in our country. In order to select the suitable methods for real-time measurement of nanoparticles number concentration distribution and fine particle mass concentration in our country, the performance of Scanning Mobility Particle Sizer (SMPS) and filter dynamic measurement system (FDMS) will also be evaluated. For the SMPS, the investigation will focus on the number size distribution of agglomerate particles. For the FDMS, its PM2.5 real-time monitoring mass concentration will be compared with the results obtained from a collocated WINS PM2.5 sampler whose sampling procedure follows the standard manual sampling method proposed by the National Institute of Environmental Analysis (NIEA).