In:
Marine and Freshwater Research, CSIRO Publishing, Vol. 52, No. 6 ( 2001), p. 885-
Kurzfassung:
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.
Materialart:
Online-Ressource
ISSN:
1323-1650
Sprache:
Englisch
Verlag:
CSIRO Publishing
Publikationsdatum:
2001
ZDB Id:
1283028-8
SSG:
12
SSG:
21,3
