Abstract
Commercial dried Hijiki, Sargassum fusiforme*4, was soaked in a 4% acetic acid or 4% sodium hydrogen carbonate solution for 1, 3 and 6hr at 0, 30, 60, and 90℃. The concentrations of arsenic retained in the swollen Hijiki tissues and those dissolved in the solution were determined by thermal neutron activation analysis. Within 1 hr in the acetic acid and sodium hydrogen carbonate solutions at 90℃, the concentrations of retained arsenic in the Hijiki residues were 18% (in the acetic acid solution) and less than 15% (in the sodium hydrogen carbonate solution), respectively, of the total arsenic. At the lower temperatures (0℃, 30℃), arsenic release was greater in the acetic acid solution than in the sodium hydrogen carbonate solution.
