Citation: GAO Jing-Jing, LIU Ji-Hua, LI Xian-Guo, ZHANG Hui, HE Lian-Hua. Chemical Phase Analysis of Rare Earth Elements in Cobalt-rich Crusts and Its Application[J]. Chinese Journal of Analytical Chemistry, ;2015, 43(12): 1895-1900. doi: 10.11895/j.issn.0253-3820.150418 shu

Chemical Phase Analysis of Rare Earth Elements in Cobalt-rich Crusts and Its Application

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¹ Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;

Corresponding author: LIU Ji-Hua,
Received Date: 20 May 2015
Available Online: 15 August 2015
Fund Project: 本文系国家自然科学基金项目(No.40976038) (No.40976038)国际海域资源调查与开发"十二五"规划项目(No.DY125-13-R-07) (No.DY125-13-R-07)国家海洋局第一海洋研究所基本科研业务费项目(No.GY02-2012G35) (No.GY02-2012G35)国家海洋局青年海洋科学基金项目(No.2012325)资助 (No.2012325)

Selective chemical extraction method was utilized to fractionally extract rare earth elements(REEs) in cobalt-rich crusts and bedrock samples from the Pacific survey area, and REEs concentrations were determined by inductively coupled plasma mass spectrometry(ICP-MS). A method was established for the chemical phases analysis of REEs in cobalt-rich crusts. The results showed that the REEs enrichment in different phases in cobalt-rich crusts conformed to the following order:iron oxide phase >manganese oxide phase >residual phase >carbonate phase >adsorbed phase. About 70.2%-73.9% of total REEs contents were mainly enriched in the iron oxide phase and the recoveries were 94.8%-105.9%. Therefore, most of REEs were controlled by amorphous FeOOH minerals. In different geological bodies, occurrence phase of REEs had significant difference. REEs were mainly enriched in the carbonate phase in carbonate rock, the residual phase in basalt and phosphate rock, and the iron oxide phase in cobalt-rich crusts and polymetallic nodules. In different structural layer of cobalt-rich crusts, REEs in the new layer were mainly enriched in the iron oxide phase, and REEs in the old layer were mainly enriched in the residual phase. It suggested that phospharization played a more significant role on the REEs enrichment in the old layer.
- Cobalt-rich crusts,
- Rare earth elements,
- Chemical phase,
- Selective chemical extraction method
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