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Analysis of low-level I-129 in brine using accelerator mass spectrometry
Chen, N (Chen, Ning)[ 1,2 ]; Hou, XL (Hou, Xiaolin)[ 1 ]; Zhou, WJ (Zhou, Weijian)[ 1,3 ]; Fan, YK (Fan, Yukun)[ 1 ]; Liu, Q (Liu, Qi)[ 1,2 ]

An improved solvent extraction procedure for iodine separation from brine samples has been applied at Xi'an Accelerator Mass Spectrometry (AMS) center. Oil in the brine sample has to be removed to avoid appearance of the third phase during solvent extraction and to improve the chemical yield of iodine. The small amount of oil remained in the water phase was first removed by phase separation through settling down sufficiently based on their immiscibility, and then by filtration through a cellulose filter, on which oil was absorbed and removed. After oil removed, extraction recovery of iodine could achieve more than 90 %. The sodium bisulfite as an effective reductant should be added before acidification to avoid loss of iodine by formation of I-2 in sample via reaction of iodate and iodide at pH 1-2, and then pH was adjusted to 1-2 to reduce the iodate to iodide followed by oxidation of iodide to I-2 and solvent extraction to separate all inorganic iodine. As a pre-nuclear era sample, I-129/I-127 ratio in brine is normally more than two orders of magnitude lower than that in present surface environmental samples, so prevention of cross-contamination and memory effect in apparatus during processing procedure are very critical for obtaining reliable results, and monitoring the procedure blank is very important for analytical quality of I-129. The I-129/I-127 isotopic ratio in the brine samples and procedure blank of iodine reagents were measured to be (1.9-2.7) x 10(-13) and 2.08 x 10(-13), respectively, 3-4 orders of magnitudes lower than that in environmental samples in Xi'an, and the result of procedure blank is in the same level as the previous experiments in past 3 years, indicating contamination is not observed in our method.

KeywordIodine-129 Radiochemical Separation Accelerator Mass Spectrometry Oil Field Water Brine Geological Dating
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Document Type期刊论文
Corresponding AuthorHou, XL (Hou, Xiaolin)[ 1 ]
Affiliation1.Xi’an AMS Center, State Key Laboratory of Loess andQuaternary Geology, Institute of Earth Environment, ChineseAcademy of Sciences, Xi’an, China;
2.University of Chinese Academy of Science, Beijing, China;
3.Xi’an JiaoTong University, Xi’an, China
Recommended Citation
GB/T 7714
Chen, N ,Hou, XL ,Zhou, WJ ,et al. Analysis of low-level I-129 in brine using accelerator mass spectrometry[J]. JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY,2014,299(3):1965-1971.
APA Chen, N ,Hou, XL ,Zhou, WJ ,Fan, YK ,&Liu, Q .(2014).Analysis of low-level I-129 in brine using accelerator mass spectrometry.JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY,299(3),1965-1971.
MLA Chen, N ,et al."Analysis of low-level I-129 in brine using accelerator mass spectrometry".JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 299.3(2014):1965-1971.
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