期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 40, 期 7, 页码 2200-2205出版社
AMER CHEMICAL SOC
DOI: 10.1021/es051443b
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The photodegradation of domoic acid in model seawater containing varying amounts of total Fe(III) (expressed as Fe(III)), NO3-, total phosphate (expressed as PO43-), 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)](0) 0-4 mu; [NO3-](0) 0-35 mu M; [PO43-](0) 0-4 mu M; [DOM](0) 0-10 mg/L), it is apparent that Fe(III) and DOM are significant promoters of domoic acid photooxidation. In contrast, PO43- interacts with Fe(III) to inhibit the photooxidation of domoic acid, but PO43- 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/m(2) and initial domoic acid concentration of 0.96 mu M, domoic acid half-lives range over 12-36 h, with half-life a function of [Fe(Ill)], [PO43-], and dissolved organic matter loadings. An NMR based technique for measuring domoic acid-Fe(III) binding (1.72 x 10(11)) is reported.
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