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首页> 外文期刊>Environmental Science & Technology >Pu and ~(137)Cs in the Yangtze River Estuary Sediments: Distribution and Source Identification
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Pu and ~(137)Cs in the Yangtze River Estuary Sediments: Distribution and Source Identification

机译：长江口沉积物中的Pu和〜（137）Cs：分布和来源识别

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摘要

Pu isotopes and ~(137)Cs were analyzed using sector field ICP-MS and y spectrometry, respectively, in surface sediment and core sediment samples from the Yangtze River estuary. ~(239+240)Pu activity and ~(240)Pu/~(239)Pu atom ratios (>0.18) shows a generally increasing trend from land to sea and from north to south in the estuary. This spatial distribution pattern indicates that the Pacific Proving Grounds (PPG) source Pu transported by ocean currents was intensively scavenged into the suspended sediment under favorable conditions, and mixed with riverine sediment as the water circulated in the estuary. This process is the main control for the distribution of Pu in the estuary. Moreover, Pu is also an important indicator for monitoring the changes of environmental radioactivity in the estuary as the river basin is currently the site of extensive human activities and the sea level is rising because of global climate changes. For core sediment samples the maximum peak of ~(239+140)Pu activity was observed at a depth of 172 cm. The sedimentation rate was estimated on the basis of the Pu maximum deposition peak in 1963-1964 to be 4.1 cm/a. The contributions of the PPG close-in fallout Pu (44%) and the riverine Pu (45%) in Yangtze River estuary sediments are equally important for the total Pu deposition in the estuary, which challenges the current hypothesis that the riverine Pu input was the major source of Pu budget in this area.
机译：分别使用区场ICP-MS和y光谱法分析了长江口地表沉积物和岩心沉积物中的Pu同位素和〜（137）Cs。 〜（239 + 240）Pu活度和〜（240）Pu /〜（239）Pu原子比（> 0.18）在河口从陆地到海洋以及从北到南显示出总体增加的趋势。这种空间分布模式表明，在有利条件下，由洋流运输的太平洋试验场（PPG）源Pu被密集地清除到悬浮的泥沙中，并随着河口水的循环与河流泥沙混合。此过程是河口Pu分布的主要控制因素。此外，Pu还是监测河口环境放射性变化的重要指标，因为流域目前是人类活动频繁的场所，而且由于全球气候变化，海平面也在上升。对于核心沉积物样品，在172 cm处观察到〜（239 + 140）Pu活性的最大峰。根据1963-1964年Pu的最大沉积峰估算出沉积速率为4.1 cm / a。 PPG的近场沉降Pu（44％）和江河Pu（45％）在长江口沉积物中的贡献对于河口Pu的总沉积同样重要，这挑战了当前的假设，即河床Pu输入为这方面Pu预算的主要来源。

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  • 来源
    《Environmental Science & Technology》 |2011年第5期|p.1805-1811|共7页
  • 作者

    Zhiyong Liu; Jian Zheng; Shaoming Pan; Wei Dong; Masatoshi Yamada; Tatsuo Aono; Qjuju Guo;

  • 作者单位

    The Key Lab of Ministry of Education of Coast and Island Development, Nanjing University, Nanjing 210093, China,Environmental Radiation Effects Research Group, National Institute of Radiological Sciences, 491 Anagawa, Inage-ku, Chiba-shi,263-85S5, Japan;

    Environmental Radiation Effects Research Group, National Institute of Radiological Sciences, 491 Anagawa, Inage-ku, Chiba-shi,263-85S5, Japan;

    The Key Lab of Ministry of Education of Coast and Island Development, Nanjing University, Nanjing 210093, China;

    State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China;

    Environmental Radiation Effects Research Group, National Institute of Radiological Sciences, 491 Anagawa, Inage-ku, Chiba-shi,263-85S5, Japan;

    The Key Lab of Ministry of Education of Coast and Island Development, Nanjing University, Nanjing 210093, China;

    State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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