Role of Fe(III), Phosphate, Dissolved Organic Matter, and Nitrate during the Photodegradation of Domoic Acid in the Marine Environment

The photodegradation of domoic acid in model seawater containing varying amounts of total Fe(III) (expressed as Fe(III)), NO3 -, total phosphate (expressed as PO4 3-), and dissolved organic matter (DOM) is reported. A multivariate, microscale, high-throughput experimental approach is described for e...

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Bibliographic Details
Published in:Environmental science & technology 2006-04, Vol.40 (7), p.2200-2205
Main Authors: Fisher, Justina M, Reese, James G, Pellechia, Perry J, Moeller, Peter L, Ferry, John L
Format: Article
Language:English
Subjects:
Acids
Applied sciences
Aquatic ecosystems
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Iron
Iron - chemistry
Kainic Acid - analogs & derivatives
Kainic Acid - chemistry
Magnetic Resonance Spectroscopy
Multivariate Analysis
Natural water pollution
Nitrates
Nitrates - chemistry
Phosphates - chemistry
Photodegradation
Pollution
Pollution, environment geology
Seawater
Seawater - chemistry
Seawaters, estuaries
Water Pollutants, Chemical - analysis
Water treatment and pollution
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Summary:The photodegradation of domoic acid in model seawater containing varying amounts of total Fe(III) (expressed as Fe(III)), NO3 -, total phosphate (expressed as PO4 3-), and dissolved organic matter (DOM) is reported. A multivariate, microscale, high-throughput experimental approach is described for evaluating how these components interact to control the removal of domoic acid from natural waters. Under the nominal conditions of the study ([Fe(III)]o 0−4 μM; [NO3 -]o 0−35 μM; [PO4 3-]o 0−4 μM; [DOM]o 0−10 mg/L), it is apparent that Fe(III) and DOM are significant promoters of domoic acid photooxidation. In contrast, PO4 3- interacts with Fe(III) to inhibit the photooxidation of domoic acid, but PO4 3- alone does not act to slow or accelerate domoic acid photodegradation. No other variables (singly or interactively) have a statistically significant impact. At an incident light intensity of 765 W/m2 and initial domoic acid concentration of 0.96 μM, domoic acid half-lives range over 12−36 h, with half-life a function of [Fe(III)], [PO4 3-], and dissolved organic matter loadings. An NMR based technique for measuring domoic acid−Fe(III) binding (1.72 × 1011) is reported.
ISSN:0013-936X
1520-5851
DOI:10.1021/es051443b