Migration path and isotope tracing of Cs-137 and Pu239+240 in estuary sediments: a case study of Liao River estuary in China

doi:10.1007/s11368-018-2092-2

	Migration path and isotope tracing of Cs-137 and Pu239+240 in estuary sediments: a case study of Liao River estuary in China
	Zhang, Kexin 1,2,3; Li, Guosheng 4; Pan, Shaoming 2; Qian, Xiaoqing 1; Liu, Zhiyong 5; Xu, Yihong 2; Hao, Yongpei 2
刊名	JOURNAL OF SOILS AND SEDIMENTS
	2019
卷号	19 期号:1 页码:491-500
关键词	Cs-137 Isotope tracing Liao River estuary Migration path Plutonium
ISSN号	1439-0108
DOI	10.1007/s11368-018-2092-2
通讯作者	Zhang, Kexin(xbsdzkx2008@163.com)
英文摘要	PurposeCurrently, 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.
资助项目	China 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]
WOS关键词	PU-240/PU-239 ATOM RATIOS ; PLUTONIUM ISOTOPES ; PU ISOTOPES ; VERTICAL DISTRIBUTIONS ; LACUSTRINE SEDIMENTS ; SETTLING PARTICLES ; OKINAWA TROUGH ; RADIONUCLIDES ; SEA ; TRANSPORT
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000456207800045
资助机构	China Postdoctoral Science Foundation ; Natural Science Foundation of Jiangsu Province ; Postdoctoral Science Foundation of Jiangsu Province ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/50517]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Kexin
作者单位	1.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
推荐引用方式 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.