The iodine content of 53 main food-materials in Japan was determined.(1) Seaweeds were generally rich in iodine. The highest value of 167 mg% was found indried Laminaria.(2) The iodine content of fish and beef liver was relatively high (0.2mg%-O.9mg%), a small amount of iodine was detected in seeds, nuts, pulses, and polished rice (0.04-0.09mg%).
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Katsura et al. (1960) studied this question.