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71.
本文报道了厦门筼筜湖疏浚物在不同盐度的天然海水中镉的溶出和被吸附的模拟研究结果。在相同条件下释放量(释放率)随介质盐度升高而增大,而被吸附能力降低。讨论了盐度的影响及溶出与再吸附所遵循的动力学规律。 相似文献
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The contents of Fe, Mn, Cu, Co, Ni, Pb and Zn in the seaiment associated with manganese nodules from the Northern Central Pacific Ocean and in their acid-soluble fractions were determined and correlations among the elements and between the trace metals and environmental parameters were discussed. It has been found that the contents of Mn, Cu and Ni in the sediment are one order of magnitude higher than those in the common sediment. As shown in the manganese nodules, they may mainly derive from seabed. The contents of all trace metals in the sediment are obviously governed by Fe-and Mn-oxides, organic matter, seawater depth, particle size and Eh. Multi-element correlation equations were developed for all trace metals. The trace metals in acid-soluble fraction of the sediment were also much higher than ihose of common sediment and negatively correlated with water depth, implying the possible influence of carbonate speciation. 相似文献
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The authors have determined the distributions of Ph, Cu and Cd ia surface sediment, acid-soluble fraction and interstitial water of the Changjiang Estuary and analysed the relationship between them and some environmental parameters, finding that there exists a quasi-equilibrium between the interstitial water and the sediment. The distribution of Pb or Cu in both phases it controlled mainly by the adsorptioa-desorption and deposition-solution processes of HFO" and org." in the sediments, whereas Cd is mainly controlled by the depoahisn-Jolution process of CdS. The sedimentation mechanism of Ph, Cu and Cd in the Changjlang Estuary is preliminarily proposed. 相似文献
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在海水介质中,模拟研究了厦门西港沉积物对Pb吸附过程的热力学和动力学性质,提出相应的定量模式,测定饱和吸附量、吸附速率常数和表观活化能等重要物化参数。结果表明,沉积物-Pb的吸附以化学作用为主,静电作用为辅。其吸附性质与水合氧化铁-Pb的吸附类似。 相似文献
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Hydrous titanium oxide (HTO) is a better inorganic absorbent for the extractionof uranium from sea water. Although its structure has been proposed by some authors,little attention has been paid to the relation between the structure and the property ofuranium-untaking. Some relevant articles only concentrated their efforts on the in-terior structure and little was given to the investigation of its surface properties whichplay an important part in the property of uranium-uptaking. 相似文献
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