Annual variation of stable iodine in brown sea algae (hijiki, Hizikia fusiforme)

Separation and measurement of 129I and 127I in pre-nuclear-era marine algae with ultra-low 129I/127I isotopic ratios

“…Although seawater contains about 60 ppb of 127 I, iodine in seawater is effectively concentrated in marine algae, with measured algal iodine concentrations being in the range of several tens of ppm to several thousand ppm [1][2][3][4][5][6]. The 129 I/ 127 I ratios observed in marine algal samples therefore reflect the 129 I/ 127 I ratio in seawater collected at the time.…”