
TY  - JOUR
A1  - Aldrich, Annette P. 
A1  - van den Berg, Constant M. G. 
A1  - Thies, Hansjörg 
A1  - Nickus, Ulrike 
T1  - The redox speciation of iron in two lakes
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 2001
VL  - 52
IS  - 6
SP  - 885
EP  - 890
KW  - 
UR  - https://doi.org/10.1071/MF00143 
N2  - The redox speciation of iron was determined by voltammetry in two lakes (Blelham Tarn, a lowland lake, and Gossenk&ouml;llesee (GKS), a mountain lake). The reactive iron (FeR) concentration was ~40 nM in the epilimnion of Blelham Tarn, and up to 37% of this occurred as iron(II). In contrast, the FeR concentration in GKS was much lower at ~1 nM, similar to concentrations found in the open ocean. Under ice cover the iron(II) concentration peaked in GKS just below the Chl-a maximum, amounting to 50% of FeR. In July, the Chl-a concentration was lower, and iron(II) was present throughout the water column at ~30% of FeR. This work has demonstrated that iron occurs to a large extent as iron(II) in lake waters, of greatly differing conditions, in spite of the presence of oxygen; the main cause for this is not clear because the iron(II) may have been produced biologically or photochemically (or both). This, and the unexpectedly low reactive-iron concentrations in the transparent mountain-lake waters, warrant further work to evaluate their importance to the microorganisms in the lakes. 
ER  -

