Iron and copper complexation in Macaronesian coastal waters

Dissolved iron (dFe) and copper (dCu), the concentration conditional stability constants of organic binding ligands (LFe, LCu, log KcondFe3+L KcondCu2+L) were studied in surface coastal waters Macaronesia region (Cape Verde, Canary Islands, Madeira) using competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-ACSV). Two oceanic stations also studied: Cape Verde Ocean Observatory (CVOO) European Station for Time Series Islands (ESTOC). Fe varied from 0.46 to 1.32 nM LFe concentrations between 0.56 2.96 nM. More than 98% total dFe was complexed with (log KcondFe3+L) 20.77 21.90 (L2-type ligands). Cu ranged 0.07 4.03 amount LCu 0.54 2.59 nM, more 99% dCu organically complexed. The constant showed values 13.40 14.42 (L1-type). Due biological activity water mixing induced by wind around islands, dissolved metals greater at water. Variations observed eastern western parts Fogo, Tenerife Gran Canaria. On east coasts, increase related wind-induced mixing. results this study will contribute knowledge about impact areas on biogeochemical cycles.