武汉大气PM_(2.5)中稀土元素的组成特征和来源分析  

Composition Characteristics and Sources Analysis of Rare Earth Elements in PM_(2.5) in Wuhan City

作　　者：张帆[1] 成海容[1] 王祖武[1] 陈宏玲[1] 刘佳[1] 吕效谱[1] 

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430072

出　　处：《环境科学与技术》2014年第2期69-73,137,共6页Environmental Science & Technology

基　　金：国家"973"计划项目(2011CB707106);湖北省重点实验室(武汉大学)开放基金项目;中国科学院广州地球化学研究所有机地球化学国家重点实验室开放基金(OGL-201110)

摘　　要：采用电感耦合等离子体质谱(ICP-MS)分析了16种稀土元素的浓度水平,并通过球粒陨石标准化、富集因子模型等方法对其分布模式和污染来源进行了分析。研究表明,武汉PM2.5中各稀土元素浓度随时间的变化趋势大体一致,其分布符合奥多—哈尔金斯定律,并呈轻稀土富集型的分布模式,但PM2.5中轻稀土元素相对于重稀土元素的富集程度比土壤高,稀土元素在土壤中的比重要高于PM2.5。武汉PM2.5中的稀土元素部分源于土壤或扬尘,部分则来自人为源,其中Sc主要来源于人为污染源,而Pr、Nd、Sm、Dy、Ho、Er、Yb、Y等8种元素的主要来源为土壤或扬尘,La、Ce、Eu、Gd、Tb等5种元素则部分来源于土壤或扬尘,部分来源于人为源。Concentrations of 16 rare earth elements （REEs） in PMz5 in Wuhan were analyzed by inductively coupled plasma mass spectrometry. And the distributed pattern and sources of the elements were analyzed by the method of chondrite- normalized REE pattern and enrichment factor（EF） values. Results showed that the distribution of REEs in PMz5 accorded with the Odd Harkin＇s rule and characterized with the LREE enrichment. But the relative enriclunent degree of LREE in PM^5 was higher than that in soil. And the REE proportion in soil was higher than that in PMz5. The REEs were partly derived from the soil or raise dust and partly from the anthropogenic sources. The element of Sc in PMzs was derived from human activities. The soil or raise dust was the dominant source of 8 elements such as Pr, Nd, Sm, Dy, Ho, Er, Yb and Y in PMzs. The elements of La, Ce, Eu, Gd and Th in PMz5 were partly from raise dust or soil and partly from human factor.

关 键 词：武汉 PMz. 稀土元素 组成特征 来源 

分 类 号：X51[环境科学与工程—环境工程]