Zhang Zong-Wei, Yu Rui-Lian, Hu Gong-Ren, Hu Qi-Chao, Wang Xiao-Ming
Department of Environmental Science and Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China.
Center of Analysis, Beijing Research Institute of Uranium Geology, Beijing 100029, China.
Huan Jing Ke Xue. 2016 Dec 8;37(12):4504-4513. doi: 10.13227/j.hjkx.201604150.
Rare earth elements (REE) have certain properties as tracing elements which result in their special geochemical characteristics. In order to study the geochemical characteristics of REE in the dustfall and their sources, 34 dustfall samples were collected in five functional areas and potential source areas of Quanzhou City, then REE compositions, distribution patterns and characteristic parameters were analyzed together with ternary diagrams and characteristic parameter diagrams, for investigating the main provenance. The results showed that ∑REE in the dustfall presented significant spatial difference with the sequence of industrial area>heavy traffic area > commercial area > residential area > agricultural area. The lower coefficient variation of ∑REE in residential, heavy traffic, commercial areas indicated homogeneous sources of REE. The chondrite-normalized REE patterns were all of the rightward inclined type with the enrichment of LREE relative to HREE and showed obvious negative Eu anomalies which indicated that the dustfall in study area had obvious terrigenous property. Some REE characteristic parameters in each functional area were close to the average in potential source areas, failed to reveal the causes for spatial differences. The results of LaCeV diagram demonstrated that REE in the dustfall of residential area, heavy traffic area and commercial area were mainly derived from traffic source and soil dust, followed by coal combustion, δEu vs. ∑REEs diagram and HREE/MREE vs. La diagram further explained that vehicle emission was the main anthropogenic source of REE in the dustfall of heavy traffic area and commercial area. The REE in the dustfall of Quanzhou City was less affected by steelworks emissions and cement plant dust and there were additional REE sources in the dustfall of industrial and agricultural area different from other functional areas.
稀土元素（REE）作为示踪元素具有某些特性，这导致了它们特殊的地球化学特征。为了研究降尘中REE的地球化学特征及其来源，在泉州市五个功能区和潜在源区采集了34个降尘样品，然后结合三元图和特征参数图分析了REE组成、分布模式和特征参数，以探究主要物源。结果表明，降尘中∑REE呈现出显著的空间差异，顺序为工业区＞交通繁忙区＞商业区＞居民区＞农业区。居民区、交通繁忙区、商业区∑REE的变异系数较低，表明REE来源较为均匀。球粒陨石标准化REE模式均为右倾型，轻稀土相对于重稀土富集，且显示出明显的负铕异常，这表明研究区降尘具有明显的陆源性质。各功能区的一些REE特征参数与潜在源区的平均值接近，未能揭示空间差异的原因。LaCeV图结果表明，居民区、交通繁忙区和商业区降尘中的REE主要来源于交通源和土壤尘，其次是煤炭燃烧，δEu对∑REEs图和HREE/MREE对La图进一步说明，车辆排放是交通繁忙区和商业区降尘中REE的主要人为来源。泉州市降尘中的REE受钢铁厂排放和水泥厂粉尘的影响较小，工业区和农业区降尘中有不同于其他功能区的额外REE来源。
