The Content and Distribution Characteristics of Heavy Metals in Root Soils in the Jiajika Lithium Resource Area, Western Sichuan Province

GAO Juan-qin; YU Yang; WANG Deng-hong; LIU Li-jun; WANG Wei; HAO Xue-feng; DAI Hong-zhang

doi:10.15898/j.cnki.11-2131/td.201812190137

Rock and Mineral Analysis > 2019 > 38(6): 681-692. > DOI: 10.15898/j.cnki.11-2131/td.201812190137

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. DOI: 10.15898/j.cnki.11-2131/td.201812190137

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The Content and Distribution Characteristics of Heavy Metals in Root Soils in the Jiajika Lithium Resource Area, Western Sichuan Province

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

More Information

Received Date: December 18, 2018
Revised Date: June 30, 2019
Accepted Date: July 15, 2019
Published Date: October 31, 2019

Abstract

HIGHLIGHTS
(1) The temporal and spatial distribution characteristics of heavy metal content in root soils in the largest spodumene mine in Asia were investigated.

(2) The level of heavy metal in the root soils of the mining area was lower than the newly released environmental limit and was in a safe range.

(3) The beneficiation area and tailings pond had slight heavy metal enrichment due to the influence of anthropogenic sources, but far below the environmental limit.

ABSTRACT

BACKGROUNDWhen 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.
METHODSThe 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.
RESULTSThe 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.
CONCLUSIONSThe results demonstrate that this method is both practical and effective for rare earth elements analysis in barite-associated rare earth ores.
- Jiajika,
- lithium-bearing area,
- root soil,
- heavy metals,
- pollution level,
- temporal and spatial distribution,
- inductively coupled plasma-mass spectrometry

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