Institut de Ciències del Mar, CSIC , Pg Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain.
National Centre for Atmospheric Science School of Geography, Earth & Environmental Sciences, University of Birmingham Edgbaston , Birmingham, United Kingdom.
Environ Sci Technol. 2015 Dec 15;49(24):13964-72. doi: 10.1021/acs.est.5b02922. Epub 2015 Nov 18.
A number of field observations employing aerosol mass spectrometers (AMS) have demonstrated that organic matter rich in monocarboxylic acids and aliphatic carbonyls originating from cooking activities (the COA factor) contributes significantly to ambient organic matter (OM) in urban environments. Little is known about the contribution and nature of COA in rural localities. We studied the correlation of COA with chemical tracers at a rural site in the Po Valley, Italy. Our statistical approach, based on positive matrix factorization (PMF) shows that the COA factor was clearly linked to local emissions of chloride and methanesulfonic acid (MSA), chemical tracers not associated with cooking emissions, or with combustion sources. While the association with Cl is not understood at this stage, the emission of reduced sulfur compounds, aliphatic carbonyls and monocarboxylic acids is consistent with several agricultural practices (e.g., manure storage) and waste disposal systems (e.g., landfills) which characterize the suburban and rural areas of the Po Valley and of other many populated environments. It is concluded that the nature and origins of the AMS COA factor measured at a rural site are complex and include far more than the emissions from food cooking.
一些采用气溶胶质谱仪（AMS）的现场观测表明，源自烹饪活动的富含单羧酸和脂肪族羰基的有机物（COA 因子）对城市环境中的环境有机物（OM）有重要贡献。然而，关于农村地区 COA 的贡献和性质知之甚少。我们在意大利波河谷的一个农村地区研究了 COA 与化学示踪剂的相关性。我们基于正定矩阵因子分解（PMF）的统计方法表明，COA 因子与氯和甲磺酸（MSA）的本地排放明显相关，而氯和 MSA 与烹饪排放或燃烧源无关。虽然现阶段还不了解与 Cl 的关联，但还原硫化合物、脂肪族羰基和单羧酸的排放与农业活动（如粪肥储存）和废物处理系统（如垃圾填埋场）有关，这些活动是波河谷以及其他许多人口密集地区的郊区和农村地区的特征。因此得出结论，在农村地区测量的 AMS COA 因子的性质和来源很复杂，远远超出了食物烹饪的排放。
