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| 川西甲基卡锂资源富集区根系土壤重金属含量水平及时空分布特征 | |
| 引用本文： | 高娟琴,于扬,王登红,刘丽君,王伟,郝雪峰,代鸿章.川西甲基卡锂资源富集区根系土壤重金属含量水平及时空分布特征[J].岩矿测试,2019,38(6):681-692. |
| 作者姓名： | 高娟琴 于扬 王登红 刘丽君 王伟 郝雪峰 代鸿章 |
| 作者单位： | 1. 中国地质大学(北京)地球科学与资源学院, 北京 100083;2. 自然资源部成矿作用与资源评价国家重点实验室, 中国地质科学院矿产资源研究所, 北京 100037;3. 四川省地质矿产勘查开发局地质矿产科学研究所, 四川 成都 610036;4. 四川省地质调查院, 四川 成都 610081 |
| 基金项目： | 中国地质调查局地质调查项目（DD20190173） |
| 摘 要： | 锂能源金属的战略地位不断提高,与锂矿床及锂金属相关的研究也在不断跟进,锂矿区土壤重金属污染近年来持续受到关注,其含量分布情况值得深入研究。本文对亚洲最大的锂矿区——川西甲基卡根系土壤环境进行重金属含量监测,调查和评价锂矿区土壤重金属含量水平及其安全性。2016—2018年于川西甲基卡锂资源富集区采集根系土壤样品68件,采用电感耦合等离子体质谱法(ICP-MS)测定根系土壤Cd、As、Pb、Cr、Cu、Ni、Zn含量。测试结果表明,甲基卡矿区根系土壤Cd、As、Pb、Cr、Cu、Ni、Zn含量平均值分别为0.13、15.31、25.47、60.57、16.12、23.59、66.83mg/kg,与2018年8月最新颁布的农用地土壤标准对比,无一超标,均低于风险筛选值及管制值。常见矿床的尾矿库区土壤一般存在严重的重金属污染,而甲基卡尾矿库土壤重金属含量均低于环境标准限值,且矿业活动停止的三年期间尾矿库区根系土壤中Cd、As、Cr含量明显呈逐年下降趋势。本研究认为,选矿厂房及尾矿库周边根系土壤重金属由于人为源的存在有一定的富集现象,但不构成危害,废弃物对环境污染小。 |
| 关 键 词： | 甲基卡|锂资源富集区|根系土壤|重金属|污染水平|时空分布特征 电感耦合等离子体质谱法 |
| 收稿时间： | 2018/12/19 0:00:00 |
| 修稿时间： | 2019/7/1 0:00:00 |
The Content and Distribution Characteristics of Heavy Metals in Root Soils in the Jiajika Lithium Resource Area, Western Sichuan Province |
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| GAO Juan-qin,YU Yang,WANG Deng-hong,LIU Li-jun,WANG Wei,HAO Xue-feng,DAI Hong-zhang.The Content and Distribution Characteristics of Heavy Metals in Root Soils in the Jiajika Lithium Resource Area, Western Sichuan Province[J].Rock and Mineral Analysis,2019,38(6):681-692. | |
| Authors: | GAO Juan-qin YU Yang WANG Deng-hong LIU Li-jun WANG Wei HAO Xue-feng DAI Hong-zhang |
| Institution: | 1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;2. Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Natural Resources;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;3. Geology and Mineral Resources Scientific Institute, Sichuan Exploration Bureau of Geology and Mineral Resources, Chengdu 610036, China;4. Sichuan Institute of Geological Survey, Chengdu 610081, China |
| Abstract: | BACKGROUND: When inductively coupled plasma-mass spectrometry (ICP-MS) is used to determine the rare earth elements (REE) in the barite-associated light rare earth ores, Ba and light rare earth elements La, Ce, Pr, Nd, Sm, cause severe mass spectral overlap interference to the medium and heavy rare earths. Therefore, under the condition that complete digestion of oress, if the appropriate pretreatment method can be selected to achieve effective separation of the target elements from the matrix, it will be beneficial to reduce mass spectrum interferences. OBJECTIVES: To reduce the mass spectrum interferences by establishing a simple and effective pretreatment method for separation of rare earth elements from barium and other coexisting elements in barite-associated rare earth ores. METHODS: The barite-associated rare earth ores samples were fused with sodium peroxide and sodium carbonate. After dissolution of the fusion cake, the target REE and the undesired barium were precipitated in triethanolamine solution, but some matrix elements like Si, Fe, Mg, and Al in samples, and most fusion agents, were separated by filtration. The target REE were secondly precipitated in ammonium hydroxide after dissolution of the precipitates by acid, so that Ba, Sr and Ca could be separated from REE. The separation exceeds 96%, so the mass spectrum interferences caused by barium polyatomic ions were effectively reduced. In addition, the interference correction coefficients by measuring the interference concentration at m/z 138-175 of the high concentration lighter rare earths standard single element solution were adopted to account for the oxide and hydroxide overlap problem for the determination of middle and heavier rare earth elements. RESULTS: The validity of the method was evaluated by analyses of rare earth ores certified reference materials and the results were in good agreement with certified values (|RE|<10%). For the actual sample analysis of the barite-associated rare earth ores, the relative standard deviations (n=12) were from 0.5% to 4.6%, which proved that the method can be used to analyze rare earth elements in high-Ba ores. CONCLUSIONS: The results demonstrate that this method is both practical and effective for rare earth elements analysis in barite-associated rare earth ores. |
| Keywords: | barite|rare earth elements|sodium peroxide-sodium carbonate melting|precipitation separation|barium|inductively coupled plasma-mass spectrometry |
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