泉州市大气降尘中稀土元素地球化学特征及来源解析

发布时间：2018-07-10 09:13

本文选题：大气降尘 + 稀土元素　；参考：《环境科学》2016年12期

【摘要】：稀土元素因其特殊的地球化学特性,具有一定的示踪性质.为了研究泉州市大气降尘中稀土元素地球化学特征及其来源,在泉州市不同功能区以及潜在源区共采集降尘样品34份,对REE组成特征、配分模式、特征参数进行了分析并结合三角图和特征参数关系图解揭示了其来源.结果表明,泉州市大气降尘的ΣREE空间分布差异较大,由高到低顺序为工业区交通繁忙区商业区居住区农业区.居住区、交通繁忙区、商业区的ΣREE变异系数均较小,显示其来源的一致性.降尘和潜在源样品中稀土元素的配分曲线均为右倾,轻稀土相对重稀土富集,具有明显的Eu负异常,表明研究区大气降尘具有较明显的陆源属性.各功能区降尘与潜在源的部分REE特征参数平均值较接近,未能揭示空间差异的成因.LaCeV三角图解表明居住区、交通繁忙区、商业区降尘中REE主要受交通源和土壤尘的影响,其次为燃煤源.δEu-ΣREE和HREEN/MREEN-LaN关系图解进一步说明汽车尾气排放是交通繁忙区和商业区降尘中REE的主要来源.所有功能区的稀土元素受钢铁厂排放物和水泥尘的影响较小,且农业区和工业区的稀土来源与其他功能区存在差异.
[Abstract]:Rare earth elements have some tracer properties because of their special geochemical characteristics. In order to study the geochemical characteristics and origin of rare earth elements in atmospheric dust fall in Quanzhou, 34 dust fall samples were collected from different functional areas and potential sources of Quanzhou. The characteristic parameters are analyzed and the origin of the feature parameters is revealed by means of the triangular diagram and the graph of the relationship between the characteristic parameters. The results show that the 危 REE spatial distribution of atmospheric dusts in Quanzhou is quite different, and the order from high to low is the agricultural area of residential area in the commercial district of heavy traffic district in industrial area. The coefficient of variation of 危 REE in residential area, heavy traffic area and commercial district is small, indicating the consistency of its source. The distribution curves of rare earth elements in dust fall and potential source samples are all right-tilted. The enrichment of light rare earth elements is relative to heavy rare earth elements, and the negative EU anomaly is obvious, which indicates that the atmospheric dust fall in the study area has obvious continental origin properties. The average value of REE characteristic parameters of dust fall in each functional area is close to that of potential source, but the causes of spatial difference can not be revealed. LaCeV triangulation shows that REE is mainly affected by traffic source and soil dust in residential area, heavy traffic area and commercial area. The diagram of 未 Eu- 危 REE and HREENR / MREEN-LaN relationship further shows that automobile exhaust emissions are the main sources of REE in heavy traffic areas and commercial areas. The rare earth elements in all functional areas are less affected by iron and steel plant emissions and cement dust, and the sources of rare earth elements in agricultural and industrial areas are different from those in other functional areas.
【作者单位】：华侨大学化工学院环境科学与工程系;核工业北京地质研究院分析测试研究中心;
【基金】：国家自然科学基金项目(21377042,21477042) 福建省自然科学基金项目(2016J01065) 华侨大学2014级研究生科研创新能力培育项目(435)
【分类号】：X513

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