Copper complexation capacity in surface waters of the Venice Lagoon

Predicting Copper Speciation in Estuarine Waters—Is Dissolved Organic Carbon a Good Proxy for the Presence of Organic Ligands?

“…DOC concentrations measured in saline waters (Figure 1), 11,[16][17][18][19] unless samples were taken across a limited range of salinities and/or restricted to a specific ligand strength, typically derived from a single source such as river humic and fulvic acids. 16,18 It is important to note that in all cases the organic ligand complexation capacities are in the order of 1 to 100 × 10 -9 M of Cu compared with DOC concentrations in the 1 -100 × 10 -6 M range.…”

“…In other words, the complexing ligands are present at one thousandth of the total DOC concentration. Complexation capacity for Cu vs. DOC (data from 11,[17][18][19][20].…”

Anthropogenic contaminants in Venice Lagoon sediments and their pore fluids: Results from the SIOSED Project

“…Any elements associated with the iron oxide and manganese oxide phases could thus be released close to the sediment water interface (Shaw et al, 1990). In addition, trace metals may be associated with humic acids and polycyclic aromatic compounds (La Rocca et al, 1996;Delgadillo-Hinojosa et al, 2008). In the near surface sediments in San Diego Bay Montgomery et al (2008) found that bacterial mediated materialization of PAH compounds is highest in the upper centimeter of the sediments, at about the same level as where dissolved copper exceeded the concentrations of overlying waters (Gieskes et al, in preparation).…”

“…Much of the Cu and Zn in the overlying waters may be associated with organic ligands (e.g., Rivera-Duarte et al, 2005). Delgadillo-Hinojosa et al (2008) report total Cu concentrations in the Porto-Marghera area of 20-70 nM, again mostly in the area of Porto Marghera and the Industrial zone. The latter authors found that most of the copper is bound to organic compounds.…”

Complexation between Hg(II) and biofilm extracellular polymeric substances: An application of fluorescence spectroscopy

“…Studies on the interaction between EPS and heavy metals were mostly focused on the EPS from activated sludge, granular sludge and artificial biofilms of bioreactor [8][9][10][11][12]. On the other hand, the complexation between dissolved organic matter (DOM) and heavy metals has been extensively studied [16][17][18][19]. But researchers did not pay enough attention to examine the interaction of EPS with metal ions as well as its potential impacts on the species and fate of heavy metals.…”