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- Title
Short-term temporal variations in iron concentration and speciation in a canal during a summer algal bloom.
- Authors
Takashi Nagai; Akio Imai; Kazuo Matsushige; Kunihiko Yokoi; Takehiko Fukushima
- Abstract
Abstract.  We conducted field investigations in a canal connected to Lake Kasumigaura (Japan) twice weekly during a summer algal bloom to understand the temporal variations in dissolved iron and its speciation, and the controlling factors. Dissolved iron (D-Fe), which is operationally defined as that passing through a 0.2-μm pore filter, acid-labile particulate iron (LP-Fe), and chemical speciation of dissolved iron were analyzed. LP-Fe was extracted from the suspended solids (SS) on 0.2-μm pore-size filters after a 2 h soak in 25% (4.5 M) acetic acid. The chemical speciation of dissolved iron was determined using cathodic stripping voltammetry. The concentration of D-Fe ranged from 72 to 1354 nM and that of filterable labile iron (FL-Fe) from 5 to 881 nM, and both increased markedly after two heavy rains. The increased D-Fe and FL-Fe appeared to be removed within a few days. The concentrations of LP-Fe ranged from 4.1 to 16.1 μM, were much higher than those of D-Fe, and did not increase after the rains. There was a significant correlation (|r| = 0.88, P P Microcystis spp.. This suggests that the growth of specific algal species affects iron speciation in the canal.
- Subjects
ALGAL blooms; MICROALGAE; MICROORGANISMS; ALGAE
- Publication
Aquatic Sciences, 2008, Vol 70, Issue 4, p388
- ISSN
1015-1621
- Publication type
Article
- DOI
10.1007/s00027-008-8011-7