Characteristic of Pu from urban wetland and lacustrine sediments in Suzhou Industrial Park, China

Guan, Yongjin; Mai, Jingyu; Xu, Jiawei; Li, Yong

doi:10.1016/j.jenvrad.2019.106134

Cited by 12 publications

(8 citation statements)

References 35 publications

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“…1 year for global fallout radionuclides deposition from lake water to bottom sediments, given the fact that the main source of Pu isotopes in the Lake Ge was the global atmospheric fallout from the nuclear weapon tests peaked in 1963. The mean sedimentation rate at the sampling site in the Lake Ge was thus estimated to be 0.50 cm/y, which was comparable to that (0.40 ± 0.02 cm/y, the maximum layer was corresponded to the year of 1963) in the Lake Yangcheng [30]. 137 Cs was well known as a traditional and wide applied dating method because of its easy determination by gamma spectrometry without chemical separation.…”

Section: Application To the Determination Of Pu Isotopes For Sediment Datingmentioning

confidence: 53%

“…The 239+240 Pu ( 239 Pu + 240 Pu) activities in the sediment core were generally in a low range of 0.003 ± 0.000 mBq/g to 0.147 ± 0.007 mBq/ g. These values were at least one order of magnitude lower than those (from 0.012 ± 0.012 mBq/g to 1.698 ± 0.210 mBq/g) obtained in the sediments from the Lake Yangcheng [30], which is < 100 km far from the Lake Ge. However, the 240 Pu/ 239 Pu atomic ratios in the sediment core of the Lake Ge ranging from 0.137 ± 0.033 to 0.220 ± 0.047 with an average of 0.171 ± 0.016, generally fell in the range of the global fallout values [31] and also agreed well with the results (the 240 Pu/ 239 Pu atomic ratios with an average of 0.174) measured in the Lake Yangcheng [30]. This indicated that Pu in the Lake Ge should also be mainly from the global fallout.…”

Section: Application To the Determination Of Pu Isotopes For Sediment Datingmentioning

confidence: 77%

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Rapid determination of plutonium isotopes in small samples using single anion exchange separation and ICP-MS/MS measurement in NH3–He mode for sediment dating

et al. 2022

Talanta

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To accurately determine ultra-trace Pu isotopes in small environmental samples, we explored ICP-MS/MS in NH 3 -He mode, and investigated mechanism of 238 U interference removal and measurement sensitivity improvement for plutonium isotopes. The interference of uranium and uranium hydrides was effectively eliminated using 0.4 mL/min NH 3 as reaction gas by shifting them to U(NH m ) n + and UH(NH m ) n +. The overall interference of uranium was reduced to <2.4 × 10 − 7 , while remaining excellent 239 Pu sensitivity (13,900 Mcps/ (mg/L)) mainly due to ion focusing effect of Pu by helium gas. On this basis, the purification of plutonium using a single AG1-× 4 column was proved to be sufficient for accurate determination of plutonium isotopes by the developed detection method, and the detection limits for the method were estimated to be 0.16 fg (0.4 μBq) for 239 Pu, 0.046 fg (0.4 μBq) for 240 Pu and 0.039 fg (0.15 mBq) for 241 Pu. The method was validated by analyzing plutonium isotopes in certificated reference materials and reported environmental samples of only 1-2 g. The analytical results of ultra-trace Pu isotopes in small amounts (~1 g) of lake sediments obtained by the developed method were successfully applied to sediment dating.

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Section: Application To the Determination Of Pu Isotopes For Sediment Datingmentioning

confidence: 53%

Section: Application To the Determination Of Pu Isotopes For Sediment Datingmentioning

confidence: 77%

Rapid determination of plutonium isotopes in small samples using single anion exchange separation and ICP-MS/MS measurement in NH3–He mode for sediment dating

et al. 2022

Talanta

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“…The contribution of the secondary peak is mainly due to the PPG (UNSCEAR 2000). For sediment dating, 210 Pbex, 137 Cs, and 239+240 Pu activities are usually used (Ketterer et al 2002(Ketterer et al , 2004bZheng et al 2008;Guan et al 2020). Meanwhile, the 240 Pu/ 239 Pu atom ratio can also be used as a reference to determine the year with 239+240 Pu.…”

Section: Application Of Dating 239+240 Pu Activity In Marine Sedimentmentioning

confidence: 99%

“…There are two main input channels of Pu isotopes in the ocean: one is global fallout from atmospheric nuclear tests ( 240 Pu/ 239 Pu = 0.179 ± 0.019) (Kelley et al 1999), and the other is from the United States nuclear test sites in the Marshall islands in the Pacific Ocean (Pacific Proving Grounds, PPG) (Muramatsu et al 2001) ( 240 Pu/ 239 ). In the past decades, numerous studies have been carried out to investigate source terms, transport, and scavenging and deposition processes of Pu isotopes in an inland sea (Bohai Sea), three marginal seas (Yellow Sea, East China Sea, and South China Sea), and some estuaries of China (Huh and Su 1999;Su and Huh 2002;Lee et al 2003;Wang and Yamada 2005;Hong et al 2006;Zheng and Yamada 2006;Dong et al 2010;Liu et al 2011a;Pan et al 2011;Wu et al 2014Wu et al , 2020Wang et al 2017;Wang et al 2019aWang et al , 2019bXu et al 2018;Guan et al 2020;Zhang et al 2020) (Table 1). In particular, many previous studies have also reported that the sources of Pu in the marginal seas of China are mainly from extensive atmospheric nuclear weapons tests since 1945 and close-in fallout from the PPG (where a series of US nuclear tests were conducted in the 1940s-1950s) through ocean currents and water masses based on 240 Pu/ 239 Pu atom ratios (0.30-0.36) (Huh and Su 1999;Su and Huh 2002;Lee et al 2003;Wang and Yamada 2005;Hong et al 2006;Zheng and Yamada 2006;Dong et al 2010;Liu et al 2011a;Pan et al 2011;Wu et al 2014…”

Section: Introductionmentioning

confidence: 99%

Distribution and source of Pu in the sediments of the seas and estuaries of China—a review

Wang

2020

Anthropocene Coasts

Self Cite

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The coastal zone is the most concentrated area of human activities, and it is also the main accumulation zone of continental sediments, which is an ideal area for studying anthropocene sedimentary records. This study summarizes the distribution of 239+240Pu activity, 239+240Pu inventory, and 240Pu/239Pu atom ratios in the sediments of the seas and estuaries of China. Studies have shown that the distribution of 239+240Pu activity in sediments is mainly influenced by sediment properties and ocean current dynamics. Furthermore, 239+240Pu activity in sediment cores has obvious peak characteristics, which can be used in sediment dating. In fact, 240Pu/239Pu atom ratios indicate that the Pu in the sediments of the seas and estuaries of China mainly comes from global fallout and the Pacific Proving Grounds (PPG). Pu from the PPG enters the seas of China through the North Equatorial Current and Kuroshio intrusion current. And the contribution of Pu from the PPG in the East China Sea, the South China Sea, and the Yangtze estuary is over 40%. Moreover, Pu has been applied in the tracer of land–sea interactions and ocean dynamics, and it can be used as a background value to study the changes of Pu in the coastal zone of China in the future.

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“…However, there are only 20 lakes and 28 sediment cores to use 239+240 Pu for dating and source recognition in China. 1,4,12−27 Many earlier studies have investigated the vertical distribution of the 239+240 Pu activity and 240 Pu/ 239 Pu atom ratio in lake sediment cores, but they examined only one sediment core [12][13][14][15][20][21][22]26 or a limited number of sediment cores in a specific lake and reservoir. 16,18,19,25 In particular, the relationship between the position of the 239+240 Pu peak and the sedimentation rate in different lake sediment cores still lacks comprehensive research, and the source of 239+240 Pu in Chinese lake sediment cores needs to be summarized.…”

Section: Introductionmentioning

confidence: 99%

Radionuclide ^239+240Pu for Dating and Sedimentation Rate in Chinese Lakes

Huang

Zhang

Zhi

et al. 2022

ACS Earth Space Chem.

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Radionuclide 239+240Pu dating and sedimentation rate is a crucial parameter for studying lake sedimentary processes. To comprehensively investigate 239+240Pu vertical distributions and relevant processes in Chinese lakes, this study collects and summarizes 54 sediment core samples from 40 lakes and reservoirs globally. First, the results suggest that two typical vertical distributions of 239+240Pu are summarized in Chinese lakes. The location of the 239+240Pu peak corresponds to the age of global atmospheric nuclear test deposition in 1963 ± 1. Second, 239+240Pu based on 1963 peak is far more suitable for lake dating compared to 137Cs, and a significant linear correlation (R 2 = 0.924) between the depth of 239+240Pu maximum value (cm) and sedimentation rate (cm a–1) in Chinese lakes was established. For the first time, this study has found that this significant linear relationship can be generalized globally (R 2 = 0.909), regardless of where the lake sediment cores were sampled. Third, we identify three typical vertical distributions for the 240Pu/239Pu atom ratio in Chinese lake sediment cores: invariant distribution, mutation distribution, and gradient distribution. This result implies that 239+240Pu in Chinese lakes mainly originate from the global fallout; yet this does not rule out the potential contribution from local sources of 239+240Pu, such as the Lop Nor nuclear tests, the atomic city nuclear activities, and the Chernobyl nuclear accident. However, the trend in the average 240Pu/239Pu ratio varies independent of latitude. Moreover, a significant positive linear correlation is detected between average 239+240Pu inventory in the soil and lake cores, with a coefficient of 0.538. In particular, the high 239+240Pu inventory background value in Northwest China closely correlates with the deposition of 239+240Pu in some lakes (e.g., Lake Sugan). This manuscript provides insights into 239+240Pu vertical patterns and processes in Chinese lakes and sheds light on future research using 239+240Pu for dating and sedimentation rate in lakes outside China.

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Characteristic of Pu from urban wetland and lacustrine sediments in Suzhou Industrial Park, China

Cited by 12 publications

References 35 publications

Rapid determination of plutonium isotopes in small samples using single anion exchange separation and ICP-MS/MS measurement in NH3–He mode for sediment dating

Rapid determination of plutonium isotopes in small samples using single anion exchange separation and ICP-MS/MS measurement in NH3–He mode for sediment dating

Distribution and source of Pu in the sediments of the seas and estuaries of China—a review

Radionuclide ^239+240Pu for Dating and Sedimentation Rate in Chinese Lakes

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Characteristic of Pu from urban wetland and lacustrine sediments in Suzhou Industrial Park, China

Cited by 12 publications

References 35 publications

Rapid determination of plutonium isotopes in small samples using single anion exchange separation and ICP-MS/MS measurement in NH3–He mode for sediment dating

Rapid determination of plutonium isotopes in small samples using single anion exchange separation and ICP-MS/MS measurement in NH3–He mode for sediment dating

Distribution and source of Pu in the sediments of the seas and estuaries of China—a review

Radionuclide 239+240Pu for Dating and Sedimentation Rate in Chinese Lakes

Contact Info

Product

Resources

About

Radionuclide ^239+240Pu for Dating and Sedimentation Rate in Chinese Lakes