University of Southern California, Department of Civil and Environmental Engineering, 3620 South Vermont Avenue, Los Angeles, CA 90089, USA.
Environ Pollut. 2013 Oct;181:14-23. doi: 10.1016/j.envpol.2013.06.001. Epub 2013 Jun 22.
Year-long sampling campaign of quasi-ultrafine particles (PM₀.₂₅) was conducted at 10 distinct locations across the Los Angeles south coast air basin and concentrations of trace elements and metals were quantified at each site using high-resolution inductively coupled plasma sector field mass spectrometry. In order to characterize sources of trace elements and metals, principal component analysis (PCA) was applied to the dataset. The major sources were identified as road dust (influenced by vehicular emissions as well as re-suspended soil), vehicular abrasion, residual oil combustion, cadmium sources and metal plating. These sources altogether accounted for approximately 85% of the total variance of quasi-ultrafine elemental content. The concentrations of elements originating from source and urban locations generally displayed a decline as we proceeded from the coast to the inland. Occasional concentration peaks in the rural receptor sites were also observed, driven by the dominant westerly/southwesterly wind transporting the particles to the receptor areas.
在洛杉矶南海岸大气盆地的 10 个不同地点进行了长达一年的准超细微粒（PM₀.₂₅）采样活动，并使用高分辨率电感耦合等离子体质谱扇形场质谱法在每个地点定量测定微量元素和金属的浓度。为了表征微量元素和金属的来源，对数据集进行了主成分分析（PCA）。主要来源被确定为道路灰尘（受车辆排放和再悬浮土壤的影响）、车辆磨损、残余油燃烧、镉源和金属电镀。这些来源总共占准超细微粒元素含量总方差的约 85%。源自源和城市位置的元素浓度通常随着我们从海岸向内陆推进而下降。在农村接收点也观察到了偶尔的浓度峰值，这是由主导的西风/西南风将颗粒输送到接收区造成的。
