Citation: CHE Hong, ZHANG Jing, ZHAO Zhi-Qi, HE Hui-Jun. Measurement of Neodymium Isotope in Seawater and Its Significance in Mixing of Water Masses[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(9): 1393-1399. doi: 10.11895/j.issn.0253-3820.171172 shu

Measurement of Neodymium Isotope in Seawater and Its Significance in Mixing of Water Masses

CHE Hong ^1, ,
ZHANG Jing ^1,2 ,
ZHAO Zhi-Qi ³ ,
HE Hui-Jun ¹

1.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266061, China;
2.
Earth and Environmental System, Graduate School of Science and Engineering, University of Toyama, Toyama 9308555, Japan;
3.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, China Academy of Sciences, Guiyang 550002, China

Received Date: 26 August 2017
Revised Date: 26 June 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 41530965, 41276071).

Neodymium (Nd) isotopes are widely used for oceanographic processes because of its stable properties in nature. Due to the low concentration of Nd in the seawater, pre-separation and enrichment are necessary in the analysis of Nd isotopes. The traditional separation method usually uses co-precipitation with hydrous Fe oxide to separate rare earth elements (REEs), and LN resin to separate and purify Sm and Nd, respectively. But the concentration process is time-consuming. In this work, a concentration method for REEs in seawater was developed on the basis of NOBIAS resin. The experimental conditions of this method, such as the range of pH, elution acid concentration of NOBIAS resin, and elution acid volume for LN -C50-A resin were optimized. The results indicated that, at pH 4.7, the recovery of Nd was about 99% when pre-concentrated with NOBIAS resin and the recovery of Nd was over 93% when purified with LN-C50-A resin. The method showed an excellent experimental reproducibility (RSD<1.5%; n=3) and a very low systematic error (RSD<5%, n=5) in the determination of Nd and its isotope.
- Seawater,
- Neodymium isotope,
- LN-C50-A resin,
- NOBIAS resin,
- Influencing factors
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