Citation: LU Tong, HOU Xiao-Lin, ZHANG Lu-Yuan, CHEN Ning, ZHANG Wei-Chao, WANG Yan-Yun. Determination of Low Level Uranium Isotopes in Vegetation Samples[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(7): 1137-1144. doi: 10.11895/j.issn.0253-3820.181098 shu

Determination of Low Level Uranium Isotopes in Vegetation Samples

LU Tong ^1,2,3, ,
HOU Xiao-Lin ^1,2 ,
ZHANG Lu-Yuan ^1,2 ,
CHEN Ning ^1,2,3 ,
ZHANG Wei-Chao ^1,2,3 ,
WANG Yan-Yun ^1,2,3

1.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China;
2.
Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi'an Accelerator Mass Spectrometer Center, Xi'an 710061, China;
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 5 February 2018
Revised Date: 2 April 2018

Fund Project: This work was supported by the Ministry of Science and Technology of China (No. 2015FY110800), the National Natural Science Foundation of China (No. 11605207) and the State Key Laboratory of Loess and Quaternary Geology.

An analytical method was developed for determination of low-level uranium isotopes in vegetation samples. Dry ashing method was employed to decompose organic matters of vegetation. The sample ash was further digested using multiple acids. Uranium in the prepared sample solution was separated and purified by an extraction chromatography using UTEVA resin. The chemical recovery of uranium in the separation procedure was more than 94%, and more than 99% of Na, K, Ca and other matrix elements and interfering elements were removed. Three natural uranium isotopes were finally measured with high sensitivity ICP-MS/MS. The detection limits of the method for²³⁸U, ²³⁵U, ²³⁴U were 3.05, 0.34 and 0.04 pg/g, respectively. The detection limits for ²³⁸U and ²³⁵U were 10 times better than the reported values. Analysis result of U in GBW-10046 standard reference material was in good agreement with reference value, indicating that this method was reliable. The method was successfully applied to determination of uranium isotopes in the vegetation samples collected in Xi'an region, and it was found that the uranium concentrations and isotopic ratios in these vegetation samples fall well into natural level, and there was no significant artificial uranium contamination. This was the first survey of the three natural uranium isotopes in vegetation samples in this region.
- Uranium,
- Isotope ratio,
- Vegetation samples,
- Solid phase extraction,
- Inductively coupled plasma tandem mass spectrometry
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