Department of Chemistry, Colorado State University, Fort Collins, CO, USA 80523.
Environ Sci Process Impacts. 2019 Aug 14;21(8):1280-1300. doi: 10.1039/c9em00228f.
The House Observations of Microbial and Environmental Chemistry (HOMEChem) study is a collaborative field investigation designed to probe how everyday activities influence the emissions, chemical transformations and removal of trace gases and particles in indoor air. Sequential and layered experiments in a research house included cooking, cleaning, variable occupancy, and window-opening. This paper describes the overall design of HOMEChem and presents preliminary case studies investigating the concentrations of reactive trace gases, aerosol particles, and surface films. Cooking was a large source of VOCs, CO2, NOx, and particles. By number, cooking particles were predominantly in the ultrafine mode. Organic aerosol dominated the submicron mass, and, while variable between meals and throughout the cooking process, was dominated by components of hydrocarbon character and low oxygen content, similar to cooking oil. Air exchange in the house ensured that cooking particles were present for only short periods. During unoccupied background intervals, particle concentrations were lower indoors than outdoors. The cooling coils of the house ventilation system induced cyclic changes in water soluble gases. Even during unoccupied periods, concentrations of many organic trace gases were higher indoors than outdoors, consistent with housing materials being potential sources of these compounds to the outdoor environment. Organic material accumulated on indoor surfaces, and exhibited chemical signatures similar to indoor organic aerosol.
家庭环境微生物和化学观测（HOMEChem）研究是一项合作性的实地调查，旨在探究日常活动如何影响室内空气中痕量气体和颗粒的排放、化学转化和去除。在研究住宅中进行了连续和分层的实验，包括烹饪、清洁、可变入住率和开窗。本文描述了 HOMEChem 的总体设计，并介绍了初步案例研究，这些研究调查了反应性痕量气体、气溶胶颗粒和表面膜的浓度。烹饪是 VOCs、CO2、NOx 和颗粒的主要来源。就数量而言，烹饪颗粒主要处于超细模式。有机气溶胶主导了亚微米质量，虽然在每餐之间和烹饪过程中有所变化，但主要由碳氢化合物特征和低含氧量的成分组成，类似于烹饪油。房屋的空气交换确保烹饪颗粒只存在很短的时间。在无人居住的背景间隔期间，室内的颗粒浓度低于室外。房屋通风系统的冷却盘管引起水溶性气体的循环变化。即使在无人居住期间，许多有机痕量气体的浓度在室内也高于室外，这与房屋材料可能是这些化合物向室外环境的潜在来源一致。有机物质在室内表面积累，并表现出与室内有机气溶胶相似的化学特征。
