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首页> 外文期刊>Journal of Asian earth sciences >Source and sinks of ~(210)Pb in oceanic margins of east coast Peninsular Malaysia
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Source and sinks of ~(210)Pb in oceanic margins of east coast Peninsular Malaysia

机译：东海岸半岛马来西亚海洋边缘的〜（210）PB的来源和汇

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摘要

A total of 97 surficial sediment samples were collected from the Kelantan River, Pahang River and offshore water of Peninsular Malaysia located in the east coast mainly in to investigate the sources and sinks of Pb-210 in the southern South China Sea region. At the locations studied, the concentration activity of Pb-210 was recorded from the Kelantan River (n = 28), Pahang River (n = 44) and offshore waters (n = 25), ranging from 2.7 +/- 0.46 Bq/kg to 52.07 +/- 5.23 Bq/kg, 8.65 +/- 3.56 Bq/kg to 83.04 +/- 6.71 Bq/kg, and 6.72 +/- 2.92 Bq/kg to 42.2 +/- 3.94 Bq/kg, respectively. Both riverine systems received huge amounts of Pb-210 concentrations via mobilised particulate matter, where erosional igneous rocks and weathered sedimentary layers were prominent in elevating the amount of Pb-210 from the source towards the sinks. In the offshore margins, the concentrations differed according to the source. As both rivers move towards the sinks in the coastal territories, boundary scavenging becomes prominent. In the offshore territories, a deficiency of Pb-210 leads to excess Ra-226 in the water column. Scavenged nuclide imported from several sources may increase the total concentrations lingering in the offshore waters of Peninsular Malaysia. Particulate matter mobilised from several sources via upwelling or downwelling in the bottom current through lateral transport further enhances the removal of particle-reactive nuclides from the water column. At the same time, atmospheric deposition via precipitation and transboundary mobilisation of aerosol by mineral dust may increase the total flux on the offshore waters of Peninsular Malaysia.
机译：从位于东海岸的半岛马来西亚的海洋河流，彭康河和海上水中收集了97种表格沉积物样品，主要是调查南海南海地区PB-210的来源和汇。在所研究的位置，从Kelantan River（N = 28），PB-210的浓度活性从Kelantan River（N = 28）和海上水域（n = 25）记录，范围从2.7 +/- 0.46 bq / kg到52.07 +/- 5.23 BQ / kg，8.65 +/- 3.56 bq / kg至83.04 +/- 6.71 bq / kg，6.72 +/- 2.92 bq / kg分别为42.2 +/- 3.94 bq / kg。通过动员的颗粒物质，河流系统均获得了大量的PB-210浓度，其中侵蚀的火岩和风化沉积层突出，在将PB-210从源朝向水槽升高。在海上边距，浓度根据来源不同。随着两个河流朝着沿海地区的水槽移动，边界清除变得突出。在离岸地区，PB-210的缺乏导致水柱中的过量RA-226。从几个来源进口的清除核素可能会增加半岛马来西亚海上水域的总浓度。通过横向传输通过覆盖或疏浚从多个来源移动的颗粒物质进一步增强了从水柱中除去颗粒反应性核素。与此同时，通过矿物粉尘的沉淀和越野迁移气雾剂的大气沉积可能会增加半岛马来西亚海上水的总通量。

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