The main objective of this Thesis is to study the main aspects about the cycle and biogeochemical processes of trace elements in the Vigo Ria and adjacent coastal waters, as well as to tackle the significance of punctual and chronic contamination. This main objective can be detailed as follows:
o Set up a fast and multielement voltammetric (Adsorptive Cathodic Stripping Voltametry; AdCSV) method valid for the analysis of trace metals in a wide type of samples (different matrices and concentrations). This method will be applied to analyze copper, nickel and vanadium in continental waters (rivers, streams and sewage treatment plants), estuarine waters, sediment porewaters, coastal and open-ocean waters. o Establish the levels or concentrations of trace metals in the
sorroundings of the Vigo Ria, both in the dissolved and particulate fractions of the water column and in the sediment. From these data, the evolution of the contamination after the settlement of sewage treatment plants will be found out. Dissolved metals will be determined by means of the previously set up method together with the classical ASV (Anodic Stripping Voltammetry) method for the simultaneous determination of Cu, Pb, Zn y Cd in water. Regarding the surface and core sediments and the particulate matter, Atomic Absorption Spectroscopy was employed after appropriate sample acid-digestion.
o Quantify the estuarine-ria exchange of trace metals and the importance of benthic trace metal fluxes to the Vigo Ria waters.
o Determine the organic speciation of Cu in the continental inputs (rivers and sewage treatment plants) and its behaviour during the estuarine mixing in the Vigo Ria, paying special attention to the potential redistribution between different phases (dissolved, particulate and sediment) during mixing process.
o Evaluate the potential role of the Prestige tanker accident in front of the Galician coasts (November 2002) on trace metal contamination in basis to the natural levels of the region.
Part I; Chapter 1
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