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51.
Morell V 《Science (New York, N.Y.)》1994,263(5147):611-612
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Castellón Plain is a natural area with an extension of 464 km2, situated in Castellón (eastern coast of Spain), with an important number of ceramic industries which generate waste waters containing cadmium and zinc. In this paper, equilibrium adsorption isotherms have been obtained to examine the behaviour of cadmium and zinc in three selected soils of Castellón Plain (Spain) by means of batch experiments. Both metals exhibit non-linear adsorption isotherms with adsorption maximum beyond the dissolved concentration range considered in this study. Statistical analysis showed that data fit slighty better to Freundlich linearization than that of Langmuir. Adsorption coefficients obtained from Freundlich approximation were calculated to evaluate the relative cadmium and zinc distribution between solution and studied soils obtaining coefficients ranging from 5200 to 5900 μg kg-1μg l-1 -n for cadmium and from 3500 to 43200 μg kg-1μg l-1 -n for zinc. The effects of salt concentration and calcium competition for adsorption sites were investigated providing different concentrations of CaCl2 in background solutions. Adsorption capacities of cadmium and zinc in the studied soils decreased when the salt concentration increased. A tenfold increase in calcium concentration reduced the cadmium adsorption capacity approximately by one third whereas the Ca2+ ion does not seem a significant competitor with Zn2+ for adsorption sites in soils with high organic matter content, where precipitation of zinc can be expected. 相似文献
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Ignacio Morell Antonio Pulido-Bosch Francisco Sánchez-Martos Angela Vallejos Linda Daniele Luis Molina José María Calaforra Antoni Francesc Roig Alejandra Renau 《Water, air, and soil pollution》2008,187(1-4):65-80
Use of δ11B provides a solid tool for discriminating hydrogeochemical processes in complex coastal aquifers. Its efficiency increases markedly when it is applied along with other major or minor constituents. Nevertheless, various factors may affect its interpretation: the presence of clays, which favour adsorption and desorption, the influence of wastewaters, and even the presence of geothermalism. The δ11B has been applied to the study of a series of aquifers in south-eastern Spain: Castell de Ferro (Granada), Campo de Dalías, Lower Andarax and Sorbas (Almería), all of which are complex and heterogeneous. The results obtained demonstrate that the concentration of Br, the SO4/Cl and Cl/Br ratios are good indicators of marine intrusion. Inland some negative values of δ11B (?16.7 and ?8.1‰) are related to a geothermal influence (34.8 and 51.5°C). The boron solubility is directly related to temperature favours boron mobilization, even from the associated metapelitic deposits. The difference in the boron isotope content in two carbonate units must be caused by the different composition of the carbonate rocks, as well as a long residence time. 相似文献
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Cross‐sectional Anatomy,Computed Tomography and Magnetic Resonance Imaging of the Head of Common Dolphin (Delphinus delphis) and Striped Dolphin (Stenella coeruleoalba)
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Morell V 《Science (New York, N.Y.)》1995,268(5215):1279
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Morell V 《Science (New York, N.Y.)》1992,258(5081):391-392