The effect of salinity on binding of Cd, Cr, Cu and Zn to dissolved organic matter

Bioavailability and trophic transfer of humic-bound copper from bacteria to zooplankton

“…In the third experiment, SRHA reduced Cu uptake in copepods by 57 % in the absence of food. The humic binding measurements in Lores & Pennock (1998) suggest that approximately 60 to 80% of the Cu was bound to SRHA under the conditions similar to these experiments. However, pH was not measured in these experiments and small changes can significantly affect binding of Cu to HA.…”

“…Many of the processes involved in this competition are passive physical and chemical processes such as physical transport and binding of chemicals to living and non-living components. Earlier experiments showed the binding affinity of SRHA for Cu can change dramatically depending on the pH and salinity of the water (Lores & Pennock 1998). Biological processes such as feeding, excretion, and population dynamics can be equally important.…”

Soil Salinisation and Salt Stress in Crop Production

“…In particular, an exposure to increasing NaCl salinity increased concentration of trace elements (e.g. Cu, Zn, Cr and/or Cd) in the rhizosphere soil solution (Helal et al, 1999;Khoshgoftar et al 2004;Ondrasek et al, submitted b) or in unplanted humic solution (Lores & Pennock, 1998). Namely, organic (humics, black carbon) and inorganic (clay, hydroxides) surfaces, mostly negatively charged, compete with salt anions (Cl -, SO 4 2-) for metal cations (Cu 2+ , Al 3+ ) via adsorption and complexation reactions (e.g.…”

Characterization of the cytosolic distribution of priority pollutant metals and metalloids in the digestive gland cytosol of marine mussels: Seasonal and spatial variability

“…Lower cytosolic Cu concentration in samples from location H could be at least partially explained by the very low salinity at this location due to its position in the estuary. Owing to the fact that Cu binding to the dissolved organic matter increases when the salinity decreases (Lores and Pennock, 1998) a large proportion of Cu could have been bound to the organic matter which would decrease the Cu uptake (Lorenzo et al, 2005) and consequently the bioaccumulation in bivalves. Except for Cu dissolved organic matter has significant role also in Pb speciation in the seawater.…”