Role of Fresh Water/Sea Water Mixing on Trace Metal Adsorption Phenomena
In estuaries many phenomena affect the distribution of trace metals between dissolved and particulate forms. Laboratory experiments which are performed under carefully controlled conditions allow the study of any of these processes one by one or under conditions where one prevails.
The estuarine water/suspended solid surface behavior of Cd, Zn and Cu in the presence and in the absence of organic matter is described for SiO2, Y-Al2O3, 2 clay minerals (kaolinite and montmorillonite) and 3 sediments (Rhone River, Garonne River and Gironde estuary). The nature and concentration of suspended solid surfaces and the water pH are more important than “pure” salinity effects (increase in ionic strength, increases in concentration of competitors for adsorption and of complexing agents).
The results are used to improve the estuarine chemical speciation model of Mantoura, Dickson and Riley1 by adding the solid phase as a surface ligand.
KeywordsTrace Metal Fulvic Acid Suspended Matter Chloro Complex Complex Formation Constant
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