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Migration path and isotope tracing of Cs-137 and Pu239+240 in estuary sediments: a case study of Liao River estuary in China
Zhang, Kexin1,2,3; Li, Guosheng4; Pan, Shaoming2; Qian, Xiaoqing1; Liu, Zhiyong5; Xu, Yihong2; Hao, Yongpei2
2019
Source PublicationJOURNAL OF SOILS AND SEDIMENTS
ISSN1439-0108
Volume19Issue:1Pages:491-500
Corresponding AuthorZhang, Kexin(xbsdzkx2008@163.com)
AbstractPurposeCurrently, the distribution characteristics and transport processes of the radionuclides Cs-137 and Pu239+240 in the sediments of estuaries are still a controversial issue. Thus, in the present study, we investigated the distribution characteristics, sources and migration path of Cs-137 and Pu239+240 in sediment cores of the Liao River estuary (LRE), China, and evaluated the relative contributions of the Pacific Proving Grounds (PPG) and riverine sources of Pu for the sediments in this area. We used Cs-137 and Pu isotopes for dating the sediments and estimated the sedimentation rates by the two radionuclides in the LRE.Materials and methodsSeven sediment samples were collected using a box corer from the Liao River estuarine wetland and tidal flat in the LRE in October 2012 and April 2015, respectively. The activities of Cs-137 in the various samples were determined by spectrometry using HP-Ge detectors with 60% relative counting efficiency. Approximately 2-5g of sediment were spiked with Pu-242 (ca. 1mBq) as a chemical yield tracer for Pu isotopic analysis at the School of Radiation Medicine and Protection, Soochow University. The measurement of Pu isotopes (Pu-239, Pu-240, Pu-242) was performed by a sector field ICP-MS. In order to quantitatively differentiate the relative proportions of global fallout and PPG, we employed a two-end member mixing model to estimate their contributions.Results and discussionThe average values of Cs-137, Pu239+240 activity concentrations, and Pu-240/Pu-239 atom ratios in the surface sediment samples of the LRE were 6.7270.251mBqg(-1), 0.294 +/- 0.024mBqg(-1), and 0.188 +/- 0.049 (1 sigma), respectively. The average Pu-240/Pu-239 atom ratios ranged from 0.180 +/- 0.034 to 0.199 +/- 0.021 in sediment cores from the east and west sides of the LRE. For core LT-2 values for Cs-137 and Pu239+240 concentrations were from below the detection limit: 3.380 +/- 0.414 and 0.036 +/- 0.007 to 0.105 +/- 0.007mBqg(-1). The mean Pu-240/Pu-239 atom ratio 0.217 +/- 0.050 (1 sigma) in sediment core LT-2 lies between the global fallout and PPG close-in fallout.Conclusions We found that atmospheric fallout is the main source of Pu in sediment cores from the east and west sides of the LRE. For core LT-2, atmospheric fallout and riverine input (73.4%) are the major sources of Pu with the source of the rest of Pu (26.6%) attributed to the PPG via the Tsushima Warm Current and the coastal water of the East China Sea. The sedimentation rates (means 0.62-0.8cmyear(-1)) estimated by the two radionuclides were in good agreement and without any statistically significant difference.
KeywordCs-137 Isotope tracing Liao River estuary Migration path Plutonium
DOI10.1007/s11368-018-2092-2
WOS KeywordPU-240/PU-239 ATOM RATIOS ; PLUTONIUM ISOTOPES ; PU ISOTOPES ; VERTICAL DISTRIBUTIONS ; LACUSTRINE SEDIMENTS ; SETTLING PARTICLES ; OKINAWA TROUGH ; RADIONUCLIDES ; SEA ; TRANSPORT
Indexed BySCI
Language英语
Funding ProjectChina Postdoctoral Science Foundation[2017M611922] ; China Postdoctoral Science Foundation[2018T110559] ; Natural Science Foundation of Jiangsu Province[BK20171292] ; Postdoctoral Science Foundation of Jiangsu Province[1701186B] ; National Natural Science Foundation of China[41501286] ; National Natural Science Foundation of China[41671466]
Funding OrganizationChina Postdoctoral Science Foundation ; Natural Science Foundation of Jiangsu Province ; Postdoctoral Science Foundation of Jiangsu Province ; National Natural Science Foundation of China
WOS Research AreaEnvironmental Sciences & Ecology ; Agriculture
WOS SubjectEnvironmental Sciences ; Soil Science
WOS IDWOS:000456207800045
PublisherSPRINGER HEIDELBERG
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Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/50518
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Kexin
Affiliation1.Yangzhou Univ, Coll Environm Sci & Engn, Yangzhou 225009, Jiangsu, Peoples R China
2.Nanjing Univ, Sch Geog & Oceanog Sci, Minist Educ, Key Lab Coastal & Isl Dev, Nanjing 210023, Jiangsu, Peoples R China
3.Yangzhou Hongshuo Environm & Biol Engn Res Co Ltd, Yangzhou 225157, Jiangsu, Peoples R China
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
5.Soochow Univ, Sch Radiat Med & Protect, Suzhou 215123, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Kexin,Li, Guosheng,Pan, Shaoming,et al. Migration path and isotope tracing of Cs-137 and Pu239+240 in estuary sediments: a case study of Liao River estuary in China[J]. JOURNAL OF SOILS AND SEDIMENTS,2019,19(1):491-500.
APA Zhang, Kexin.,Li, Guosheng.,Pan, Shaoming.,Qian, Xiaoqing.,Liu, Zhiyong.,...&Hao, Yongpei.(2019).Migration path and isotope tracing of Cs-137 and Pu239+240 in estuary sediments: a case study of Liao River estuary in China.JOURNAL OF SOILS AND SEDIMENTS,19(1),491-500.
MLA Zhang, Kexin,et al."Migration path and isotope tracing of Cs-137 and Pu239+240 in estuary sediments: a case study of Liao River estuary in China".JOURNAL OF SOILS AND SEDIMENTS 19.1(2019):491-500.
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