Study on the Factors Influencing the Separation of Sr and Nd in Sediments by Ion Exchange Resin

Peng YIN; Qian HE; Hui-jun HE; Zhi-qi ZHAO

doi:10.15898/j.cnki.11-2131/td.201804170046

Rock and Mineral Analysis > 2018 > 37(4): 379-387. > DOI: 10.15898/j.cnki.11-2131/td.201804170046

Peng YIN, Qian HE, Hui-jun HE, Zhi-qi ZHAO. Study on the Factors Influencing the Separation of Sr and Nd in Sediments by Ion Exchange Resin[J]. Rock and Mineral Analysis, 2018, 37(4): 379-387. DOI: 10.15898/j.cnki.11-2131/td.201804170046

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Study on the Factors Influencing the Separation of Sr and Nd in Sediments by Ion Exchange Resin

1.
College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2.
Key Laboratory of Marine Chemistry Theory & Technology, Ministry Education, Qingdao 266100, China
3.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China

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Received Date: April 16, 2018
Revised Date: June 23, 2018
Accepted Date: August 09, 2018
Published Date: June 30, 2018

Abstract

ABSTRACT

BACKGROUNDIn geological studies, Sr and Nd isotopes are classical isotopic dating and tracer systems.
OBJECTIVESThe traditional separation method usually uses the AG50W-X8 resin to elute and separate Sr and REEs in sediments, and then uses Sr-special resin and Ln-special resin to purify Sr and Nd, respectively. However, this method has lower recovery of REEs (only 50%) for sediments with high Fe content.
METHODSIn addition, height and elution acid species of AG50W-X8 resin, Sr resin elution acid volume, and Ln resin washing ways have impacts on the separation of Sr and Nd. In this work, in order to investigate the effect of these factors on the separation of Sr and Nd in detail, we took river sediment (GBW07309) as an example.
RESULTSThe results showed that (1) high Fe content significantly affected the separation effect of Sr and Nd, and AG1-X8 resin could effectively remove Fe; (2) using 1 mL AG50W-X8 resin and HNO₃ as the eluting acid, the separation effect of Sr and REEs was the best; (3) Sr and Rb could be effectively separated when the elution acid volume of Sr-special resin reaches 15 mL; (4) Nd was separated well without trailing phenomenon when gravity column method was used to wash the Ln-special resin.
CONCLUSIONSThis method solves the Fe interference during separation of Sr and Nd. More than 99% of K, Na, Ca, Mg, Fe, Rb, and Sm were removed, which fully satisfied the requirements for the analysis of Sr and Nd isotopes. This paper provides more detailed empirical data for the separation of Sr and Nd isotopes in sediments by ion exchange resin method.
- sediments,
- Sr,
- Nd,
- ion exchange resins,
- Fe,
- rare earth elements

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Study on the Factors Influencing the Separation of Sr and Nd in Sediments by Ion Exchange Resin

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