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首页> 外文期刊>Estuarine Coastal and Shelf Science >Abundance, distribution and bioavailability of major and trace elements in surface sediments from the Cai River estuary and Nha Trang Bay (South China Sea, Vietnam)
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Abundance, distribution and bioavailability of major and trace elements in surface sediments from the Cai River estuary and Nha Trang Bay (South China Sea, Vietnam)

机译：蔡河河口和芽庄湾（越南南海）表层沉积物中主要和微量元素的丰度，分布和生物利用度

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Major (Si, Al, Fe, Ti, Mg, Ca, Na, K, S, P), minor (Mn) and trace (Li, V, Cr, Co, Ni, Cu, Zn, As, Sr, Zr, Mo, Cd, Ag, Sn, Sb, Cs, Ba, Hg, Pb, Bi and U) elements, their chemical forms and the mineral composition, organic matter (TOC) and carbonates (TIC) in surface sediments from the Cai River estuary and Nha Trang Bay were first determined along the salinity gradient. The abundance and ratio of major and trace elements in surface sediments are discussed in relation to the mineralogy, grain size, depositional conditions, reference background and SQG values. Most trace-element contents are at natural levels and are derived from the composition of rocks and soils in the watershed. A severe enrichment of Ag is most likely derived from metal-rich detrital heavy minerals such as Ag-sulfosalts. Along the salinity gradient, several zones of metal enrichment occur in surface sediments because of the geochemical fractionation of the riverine material. The parts of actually and potentially bioavailable forms (isolated by four single chemical reagent extractions) are most elevated for Mn and Pb (up to 36% and 32% of total content, respectively). The possible anthropogenic input of Pb in the region requires further study. Overall, the most bioavailable parts of trace elements are associated with easily soluble amorphous Fe and Mn oxyhydroxides. The sediments are primarily enriched with bioavailable metal forms in the riverine part of the estuary. Natural (such as turbidities) and human-generated (such as urban and industrial activities) pressures are shown to influence the abundance and speciation of potential contaminants and therefore change their bioavailability in this estuarine system. (C) 2016 Elsevier Ltd. All rights reserved.
机译：主要（Si，Al，Fe，Ti，Mg，Ca，Na，K，S，P），次要（Mn）和痕量（Li，V，Cr，Co，Ni，Cu，Zn，As，Sr，Zr，蔡河河口表层沉积物中的Mo，Cd，Ag，Sn，Sb，Cs，Ba，Hg，Pb，Bi和U）元素，其化学形式以及矿物成分，有机物（TOC）和碳酸盐（TIC）芽庄湾和芽庄湾首先沿盐度梯度确定。讨论了地表沉积物中主要元素和痕量元素的丰度和比例，与矿物学，晶粒度，沉积条件，参考背景和SQG值有关。大多数痕量元素含量都处于自然水平，并且来自流域中岩石和土壤的成分。 Ag的严重富集很可能来自富含金属的碎屑重矿物，例如Ag-硫酸盐。沿盐度梯度，由于河流物质的地球化学分馏，在表面沉积物中出现了几个金属富集区。实际和潜在生物利用形式的部分（通过四次单一化学试剂提取物分离）的锰和铅含量最高（分别高达总含量的36％和32％）。该地区可能的人为输入的铅有待进一步研究。总体而言，痕量元素的生物利用度最高的部分与易溶的非晶态Fe和Mn羟基氧化物有关。沉积物主要在河口河岸部分富含生物可利用的金属形式。自然压力（如浊度）和人为因素（如城市和工业活动）显示出影响潜在污染物的丰度和形态，从而改变其在河口系统中的生物利用度。 （C）2016 Elsevier Ltd.保留所有权利。

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