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(lll) (expressed as Fe(lll)), NO(3-), total phosphate (expressed as P04(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(lll)]o 0-4 microM; [N03-]o 0-35 microM; [P04(3-)]o 0-4 microM; [DOM]o 0-10 mg/ L), it is apparent that Fe(lll) and DOM are significant promoters of domoic acid photooxidation.