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Analysis of Inorganic and Organic-Bound Arsenic in Marine Brown Algae

Inorganic arsenic in brown algae was removed by distillation s the corresponding trichloride and assessed by absorption of the arsine-silver diethyldithiocarbamate complex. Severe digestion conditions for organicbound arsenic were found necessary to determine total arsenic analyzed subsequently by the silver diethyldithiocarbamate-pyridine reagent. Arsenic in the inorganic and organic forms ranged from 0.5 to 2.7 and 40.3 to 89.7 μg g" dry weight respectively in 7 species of the Laminariaceae, 3 species of the Alariaceae and Lessoniaceae collected in British Columbia; providing levels of inclusion similar to commercially available brown seaweed products. By contrast Sargassum muticum contained 20.8 μg g~ dry weight of inorganic arsenic, about 38% of the total concentration, and a commercial specimen of Hizikia fusiforme contained 71.8 μg g" inorganic arsenic, some 58% of the total concentration, suggesting the propensity of members of the Sargassaceae family to accumulate the inorganic form of arsenic.