Lead and Copper Speciation in Swedish Lakes and Rivers : Iron and Organic Matter as Potential Particulate/Colloidal Carriers

• It is important to monitor the speciation of the potentially toxic metals lead and copper in surface waters. The speciation can be influenced by factors such as adsorption to iron (hydr)oxides and complexation to organic matter. The aim of this study is to explore the speciation of lead and copper in soft-water lakes and rivers in boreal forests, and investigate what kind of potential factors govern the speciation. Methods included 0.45 µm in-line pre-filtration, 1 kDa tangential flow ultrafiltration and geochemical modelling using the Visual MINTEQ program in two boreal lakes, compared with measured and modelled values of 0.45 syringe pre-filtered metals concentrations performed in Swedish lakes and rivers in a larger dataset. Preliminary results indicate that particulate iron can adsorb Pb. On the contrary, Cu in particulate form did not usually appear together with iron particles. Instead, copper was present more in the smaller size fractions and was possibly associated with organic matter.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)

Nyckelord

Geochemical modelling

size fractionation

surface water

trace metals

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)