【引用本文】 王学锋, 许春雪, 顾雪, 等. 典型稀土矿区周边土壤中稀土元素含量及赋存形态研究[J]. 岩矿测试, 2019, 38(2): 137-146. doi: 10.15898/j.cnki.11-2131/td.201807180085
WANG Xue-feng, XU Chun-xue, GU Xue, et al. Concentration and Fractionation of Rare Earth Elements in Soils Surrounding Rare Earth Ore Area[J]. Rock and Mineral Analysis, 2019, 38(2): 137-146. doi: 10.15898/j.cnki.11-2131/td.201807180085

典型稀土矿区周边土壤中稀土元素含量及赋存形态研究

1. 

国家地质实验测试中心, 北京 100037

2. 

中国科学院地质与地球物理研究所, 北京 100029

3. 

中国地质大学(武汉)地球科学学院, 湖北 武汉 430074

4. 

中国地质科学院地球物理地球化学勘查研究所, 河北 廊坊 065000

5. 

广东核力工程勘察院, 广东 广州 510800

收稿日期: 2018-07-18  修回日期: 2018-12-18  接受日期: 2019-01-04

基金项目: 中国地质调查局地质调查项目(DD20160095)

作者简介: 王学锋, 硕士, 工程师, 从事地球化学及地质年代学研究。E-mail:xf2009wang@163.com

通信作者: 许春雪, 博士, 副研究员, 主要从事地球化学及分析测试标准化研究。E-mail:xuchunxue1980@163.com

Concentration and Fractionation of Rare Earth Elements in Soils Surrounding Rare Earth Ore Area

1. 

National Research Center for Geoanalysis, Beijing 100037, China

2. 

Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China

3. 

Faculty of Earth Sciences, China University of Geoscience(Wuhan), Wuhan 430074, China

4. 

Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

5. 

Guang Dong Nuclear Power Institute of Engineering Exploration, Guangzhou 510800, China

Corresponding author: XU Chun-xue, xuchunxue1980@163.com

Received Date: 2018-07-18
Revised Date: 2018-12-18
Accepted Date: 2019-01-04

摘要:研究不同类型稀土矿区周边土壤中稀土元素(REE)的含量与形态特征,可为矿区周边污染环境治理提供理论支持与科学建议。本文采用欧盟BCR顺序提取法、电感耦合等离子体质谱测定的方法,对内蒙古白云鄂博稀土尾矿区和江西赣南稀土矿区周边6个土壤样品中15种稀土元素进行了含量及形态分析测定。结果表明:矿区周边土壤中稀土元素总量约为264~15955μg/g,明显高于全国土壤背景值(186μg/g),白云鄂博尾矿区周边土壤富集轻稀土元素,稀土元素主要以残渣态富集,占总含量的64.0%~89.4%,生物有效性较低,对环境影响较小;赣南矿区周边土壤富集重稀土元素,稀土元素的主要存在形式是弱酸提取态和可还原态,占总含量的70%以上,易发生迁移转化及对周边环境造成污染。土壤中稀土元素的形态分布与pH值有显着相关性,随着土壤pH值的降低,稀土元素的弱酸提取态含量不断升高,残渣态含量不断降低。

关键词: 土壤, 稀土元素, 形态分析, 顺序提取

要点

(1) 查明了不同类型稀土矿区周边土壤中稀土元素含量空间分布特征。

(2) 对比了不同类型稀土矿区周边土壤中稀土元素形态分布特征。

(3) 发现了土壤中稀土元素的形态分布与pH值、黏土矿物比例有关。

Concentration and Fractionation of Rare Earth Elements in Soils Surrounding Rare Earth Ore Area

ABSTRACT

BACKGROUND:

The study on content and fractionation characteristics of rare earth elements (REE) in soils around different types of rare earth mining areas can provide theoretical support and scientific advice for the control of the polluted environment around the rare earth mining areas.

OBJECTIVES:

To reveal the concentration and fractionation characteristics of REE in the soils around different types of rare earth mining areas.

METHODS:

The content and fractionation of 15 rare earth elements in 6 soil samples from the Bayan Obo rare earth tailings area in Inner Mongolia and the Gannan rare earth mining area in Jiangxi Province were determined by the method of Community Bureau of Reference (BCR) sequential extraction and Inductively Coupled Plasma-Mass Spectrometry.

RESULTS:

∑REE in the soil around the mining area were 264-15955μg/g, significantly higher than the background value (186μg/g) of soils in China. LREE were enriched in the surrounding soils of the Bayan Obo mining area, and REE mainly existed in residual fraction, accounting for 64.0%-89.4% of the total content. HREE were enriched in the soils of the Gannan mining area, the main forms of REE in this area are acid-soluble fraction and reducible fraction, accounting for more than 70% of the total content. REE in the Gannan area were readily transferable and polluted the surrounding environment.

CONCLUSIONS:

The fractionation characteristics of rare earth elements in soils are strongly correlated with pH value. With the decrease of soil pH value, the content of acid extraction fraction of rare earth elements is increasing and the content of residual fraction is decreasing.

KEY WORDS: soil, REE, fractionation analysis, sequential extraction procedure

HIGHLIGHTS

(1) The spatial distribution characteristics of rare earth elements (REE) content in soils around different types of REE mining areas were illustrated.

(2) The fractionation characteristics of REE in soils around different types of REE mining areas were compared.

(3) The fractionation characteristics of REE in soils were related to pH value and clay mineral ratio.

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典型稀土矿区周边土壤中稀土元素含量及赋存形态研究

王学锋, 许春雪, 顾雪, 王亚平, 李开, 鲍征宇