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Determination of ultra-low level I-129 in vegetation using pyrolysis for iodine separation and accelerator mass spectrometry measurements
Hou, Xiaolin1,2; Wang, Yanyun1,3
2016-06-01
Source PublicationJOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
ISSN0267-9477
Volume31Issue:6Pages:1298-1310
SubtypeArticle
AbstractRadioactive isotopes of iodine are the most common radiological toxins from nuclear accidents due to their high release and high enrichment in human thyroid. Among the radioactive isotopes, long-lived 1291 can not only be used for the estimation of the radioactive risk of short-lived radioactive isotopes of iodine to humans and ecosystems, but also for the investigation of the biogeochemical cycle and environmental behavior of iodine. Accurate determination of I-129 in various environmental and biological samples is the key issue for these purposes. Due to its beta decay, low specific activity and ultra-low concentration in normal environmental and biological samples, it is important to efficiently separate iodine from the sample matrix and sensitively measure I-129. However, the complicated chemical properties of iodine and high organic content in biological samples make efficient separation of iodine very difficult using conventional acid digestion and alkaline ashing methods. By optimizing the key parameters related to the separation of iodine by pyrolysis using a tube furnace, including carbonization temperature, heating protocol, combustion assisting gas, iodine volatilization process and iodine trapping, a safe, robust and reliable pyrolysis method was established for the separation of trace amounts of iodine from biological samples with a recovery of more than 80%. By further separation of iodine, preparation of sample targets, and measurement of I-129 using AMS, a highly efficient and sensitive method for the determination of ultra low level I-129 in biological samples was developed. With this method, a detection limit of 6 x 10(-17) g g(-1) (or 0.4 nBq g(-1)) for I-129 was obtained. Compared with conventional methods, this method is easy to operate, provides highly efficient recovery of iodine, and has simple processing and less cross contamination. 5 different species of vegetation were analyzed using both the developed method and the conventional alkaline ashing method for sample decomposition, and the results agree very well with each other. The method has been successfully used for the determination of I-129 in a large number of vegetation samples.
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1039/c6ja00029k
WOS KeywordNEUTRON-ACTIVATION ANALYSIS ; ENVIRONMENTAL MATERIALS ; TIME-SERIES ; SAMPLES ; SEAWATER ; SPECIATION ; TRACER ; I-129/I-127 ; CHINA ; SEA
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Spectroscopy
WOS SubjectChemistry, Analytical ; Spectroscopy
WOS IDWOS:000378582900017
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/15653
Collection加速器质谱中心
Corresponding AuthorHou, Xiaolin
Affiliation1.Chinese Acad Sci, Xian AMS Ctr, Shaanxi Key Lab Accelerator Mass Spectrometry Tec, SKLLQG,Inst Earth Environm, Xian 710061, Peoples R China
2.Tech Univ Denmark, Ctr Nucl Technol, DK-4000 Roskilde, Denmark
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Hou, Xiaolin,Wang, Yanyun. Determination of ultra-low level I-129 in vegetation using pyrolysis for iodine separation and accelerator mass spectrometry measurements[J]. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY,2016,31(6):1298-1310.
APA Hou, Xiaolin,&Wang, Yanyun.(2016).Determination of ultra-low level I-129 in vegetation using pyrolysis for iodine separation and accelerator mass spectrometry measurements.JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY,31(6),1298-1310.
MLA Hou, Xiaolin,et al."Determination of ultra-low level I-129 in vegetation using pyrolysis for iodine separation and accelerator mass spectrometry measurements".JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 31.6(2016):1298-1310.
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