Citation: GAO Rui-Qin, HOU Xiao-Lin, ZHANG Lu-Yuan, ZHANG Wei-Chao, ZHANG Meng-Ting. Determination of Ultra-Low Level Plutonium Isotopes in Large Volume Environmental Water Samples[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(6): 765-773. doi: 10.19756/j.issn.0253-3820.201093 shu

Determination of Ultra-Low Level Plutonium Isotopes in Large Volume Environmental Water Samples

GAO Rui-Qin ^1,4, ,
HOU Xiao-Lin ^1,2,3 ,
ZHANG Lu-Yuan ^1,2,3 ,
ZHANG Wei-Chao ¹ ,
ZHANG Meng-Ting ^1,4

1.
Xi'an Accelerator Mass Spectrometry Center, State Key Laboratory of Quaternary Geology, Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China;
2.
Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an 710061, China;
3.
Open Studio for Oceanic-Continental Climate and Environment Changes, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266061, China;
4.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 22 February 2020
Revised Date: 12 March 2020

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. 11875261) and the Chinese Academy of Sciences (No. 132B61KYSB20180003).

A sensitive analytical method for determination of ²³⁹Pu and ²⁴⁰Pu in environmental water samples was developed. By co-precipitation of plutonium with Ti(OH)₃ followed by separation of plutonium using extraction chromatography with TEVA resin, a recovery of more than 80% for plutonium and a decontamination factor of 1.3×10⁵ for uranium were achieved. A triple quadrupole inductively coupled plasma mass spectrometry (ICP-MS) method with dynamic collision/reaction cell was used for measurement of plutonium isotopes. By using NH₃-He double gasses as collision/reaction gas, ²³⁸U¹H⁺ ion interference to ²³⁹Pu was significantly suppressed and the final abundance sensitivity of ²³⁸U to m/z=239 was reduced to <1×10^-11, meanwhile the sensitivity of ²³⁹Pu was improved to 990 cps/(pg/g). For 20 L of water sample, the detection limits of the method for ²³⁹Pu and ²⁴⁰Pu reached 1.28×10^-7 Bq/L and 1.38×10^-7 Bq/L, which enabled accurately determination of ²³⁹Pu and ²⁴⁰Pu in normal environmental water samples. The developed method was successfully applied to determine ²³⁹Pu and ²⁴⁰Pu in the spiked water and real environmental water samples. The results indicated this method was reliable and could be practically applied.
- Plutonium,
- Environmental water,
- Coprecipitation,
- Titanium hydroxide,
- Inductively coupled plasma mass spectrometry
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