The Distribution and Redox Chemistry of Iron in the Pettaquamscutt Estuary

A series of high resolution (10cm) vertical profiles of iron were determined across the oxic/anoxic boundary in the Lower Pond of the Pettaquamscutt Estuary. Selective chemical treatments and multiple analytical methods were used to detemine the oxidation state and lability of iron across the oxic/a...

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Bibliographic Details
Published in:Estuarine, coastal and shelf science coastal and shelf science, 1997-12, Vol.45 (6), p.769-788
Main Authors: O’Sullivan, D.W., Hanson, Jr, A.K., Kester, D.R.
Format: Article
Language:English
Subjects:
anoxic
Brackish
distribution
Earth sciences
Earth, ocean, space
estuarine
Exact sciences and technology
External geophysics
Geochemistry
iron
Mineralogy
oxidation
Physical and chemical properties of sea water
Physics of the oceans
reduction
Silicates
Water geochemistry
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Summary:A series of high resolution (10cm) vertical profiles of iron were determined across the oxic/anoxic boundary in the Lower Pond of the Pettaquamscutt Estuary. Selective chemical treatments and multiple analytical methods were used to detemine the oxidation state and lability of iron across the oxic/anoxic boundary. The vertical distributions of dissolved and total iron were determined by atomic absorption spectroscopy, and dissolved Fe(II) and reducible iron were determined using a modified Ferrozine spectrophotometric method. Well-developed maxima of total dissolved iron ≈7·5μM occurred within the oxic/anoxic transition zone. Analysis of Fe(II) by the FZ method indicates that more than 95% of the dissolved iron determined by atomic absorption spectroscopy within the maximum is in the form of Fe(II). The concentration of dissolved Fe(II) ranged from
ISSN:0272-7714
1096-0015
DOI:10.1006/ecss.1997.0239