engleski

Copper Complexing Capacity as a New Parameter for Environmental Health Monitoring of Coastal Waters

Speciation of copper in the estuarine waters of the coastal area of the Northern Adriatic (Slovenia) was estimated by applying differential pulse anodic stripping voltammetry (DPASV). Total copper concentration ranged between 10 and 60 nM, while labile copper concentration at the natural pH of the site seawater was below the detection limit of the method applied. Two classes of organic ligands that complex with copper were identified, one of lower concentration, i.e. 120 nM with higher conditional stability constant, logK = 8.30, and the other of higher concentration, i.e. 220 nM, with lower conditional stability constants, logK = 7.10. Differences in speciation parameters were estimated using samples collected during both summer and winter and at both high and low tide. The results provided evidence that copper complexing capacity in this estuary significantly changed, amounting between 98 nM and 386 nM and indicating that copper speciation was fully controlled by complexing reactions.

copper complexation capacity; organic ligands; seawater; estuary; copper pollution

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