Lake destratification and speciation of iron and manganese

Chiswell B. and Zaw M. (1991) Lake destratification and speciation of iron and manganese. Environmental Monitoring and Assessment, 19 1-3: 433-447. doi:10.1007/BF00401331

Author Chiswell B.
Zaw M.
Title Lake destratification and speciation of iron and manganese
Journal name Environmental Monitoring and Assessment   Check publisher's open access policy
ISSN 0167-6369
Publication date 1991-01-01
Sub-type Article (original research)
DOI 10.1007/BF00401331
Volume 19
Issue 1-3
Start page 433
End page 447
Total pages 15
Publisher Kluwer Academic Publishers
Subject 2304 Environmental Chemistry
2300 Environmental Science
1900 Earth and Planetary Sciences
Abstract A long-term study of the effect of artificial aeration (destratification) of a water storage dam upon the speciation of iron and manganese in the dam waters has been undertaken. Separation of dam samples into soluble and insoluble forms by selective membrane filtration was undertaken before using the techniques of EPR spectroscopy, ion chromatography and gel filtration to assess the speciation of soluble species, and selective extraction and surface analysis (ESCA, SIMS and SEM) techniques to determine the speciation of particulate iron and manganese species. The percentages of soluble iron and manganese before (1983-85) and after (1986-88) artificial aeration are compared for the periods Jan-Dec, Jan-Mar, and Jun-Aug at three depths 6 m, 15 m and 0.5 m above the dam base, to assess the importance of seasonal changes in the various depths of the dam. Although aeration had an initial marked reduction in levels of soluble iron and manganese at all depths of the dam, the concentrations of these mtals showed a steady increase over succeeding years. Analysis of the figures over summer and winter periods shows that the reduction of soluble iron was maintained in summer, but not during winter. Upon aeration, the initial reduction of soluble manganese concentration was maintained in succeeding years in the epilimnic regions of the dam, but not in the hypolimnion. Statistical analysis of data has been undertaken to correlate the changes in relationship between the various forms of iron and manganese with the advent of aeration.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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