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首页> 外文期刊>Estuarine Coastal and Shelf Science >Anthropogenic stable cesium in water and sediment of a shallow estuary, St. Louis Bay, Mississippi
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Anthropogenic stable cesium in water and sediment of a shallow estuary, St. Louis Bay, Mississippi

机译：密西西比州圣路易斯湾浅河口水和沉积物中的人为稳定铯

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St. Louis Bay (SLB), Mississippi, is a small, shallow estuary with moderate local residential and industrial development. Dissolved, stable Cs (i.e., Cs-133) was significantly enriched in bay waters (up to 1570 nM) as compared to river (<1 nM) and ocean waters (2.3 nM). A TiO2 refinery, located on the north shore of the bay, is the likely, source of the Cs, given that the highest Cs concentrations were found in waters and in surface sediments (up to 49 mu g/g) near the refinery outfall. This setting presented a unique opportunity to study remobilization of Cs in a shallow estuarine system, where sediment resuspension is frequent. Remobilization (up to similar to 3 fold increase) of dissolved Cs was observed during sediment resuspension events. A weak correlation between Cs and clay %; strong correlations among Cs, silt % and particulate organic carbon (POC); and simple numerical approaches indicate that desorption from resuspended particulate matter is the likely mechanism of Cs remobilization. Cs-enriched SLB waters can be traced to nearshore Mississippi Sound waters, but not into Mississippi Bight waters further offshore. The findings from this study also suggest that caution needs to be taken when interpreting the radio-cesium distribution in shallow estuarine and coastal systems. (C) 2015 Elsevier Ltd. All rights reserved.
机译：密西西比州的圣路易斯湾（SLB）是一个小而浅的河口，当地居民和工业发展适度。与河流（<1 nM）和海水（2.3 nM）相比，溶解的稳定Cs（即Cs-133）在海湾水域（高达1570 nM）中明显富集。考虑到在炼油厂出水口附近的水域和表面沉积物中发现的最高Cs浓度，位于海湾北岸的TiO2精炼厂可能是Cs的来源。这种设置提供了一个独特的机会来研究在沉积物重悬频繁的浅河口系统中Cs的迁移。在沉积物重悬过程中观察到溶解的Cs的迁移（最多增加了3倍）。 Cs和粘土％之间的相关性较弱； Cs，淤泥％和颗粒有机碳（POC）之间的相关性很强；简单的数值方法表明，从悬浮颗粒物中解吸是Cs迁移的可能机制。富含Cs的SLB水可以追溯到密西西比海峡近岸水域，但不能追溯到更近海的密西西比湾水域。这项研究的结果还表明，在解释浅河口和沿海系统中的放射性铯分布时应谨慎行事。 （C）2015 Elsevier Ltd.保留所有权利。

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