MRI: Development of an Automated Collection and Extraction System (ACES) for Off- or On-line Chemical Analysis of Organic Aerosol Species

这一重大研究仪器项目将侧重于开发一种从周围大气中自动收集和提取有机气溶胶的设备。该系统将在实验室和现场采样活动中与传统采样器进行比较。环境空气污染的化学表征需要低成本的自动化气溶胶采样设备。该仪器的主要特点是：(1)减少了滤膜和热解吸仪所特有的采样和分解伪影；(2)将微小颗粒沉积区域与微升量级的超低溶剂体积相结合，使设备能够实现高时间分辨率和高灵敏度；(3)溶剂提取，保留了样品的化学成分；(4)通过提高溶剂温度和压力，提高了提取效率；以及(5)使用的灵活性，因为它可以用于离线收集或与在线工具结合使用。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This Major Research Instrumentation project will focus on the development of a device to automatically collect and extract organic aerosols from the ambient atmosphere. The system will be compared with conventional samplers in the laboratory and during field sampling campaigns. Automated low-cost aerosol sampling devices are needed for chemical characterization of ambient air pollution.The key features of the instrument will be: (1) reduction of sampling and decomposition artifacts characteristic of filter-based and thermal desorption instruments; (2) a combination of a small particle deposit area with ultra-low solvent volumes, of the order of a microliter, that allows the device to achieve high time resolution and sensitivity; (3) solvent extraction that preserves the chemical composition of the sample; (4) the extraction efficiency is enhanced by using elevated solvent temperature and pressure; and (5) the flexibility of use, as it can be used for off-line collection or coupled to an online instrument.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.