摘要：Although it is alleged that lithium is not toxic to humans below an intake of 500 mg day -1, test animals have been affected at levels as low as 50 mg kg-1 of feed. This study sought to establish whether fruits grown in the Jordan Valley could accumulate sufficient lithium for consumers to reach a target of 50 mg day-1. The mean soil levels of extractable lithium were 13.1, 20.3 and 25.4 mg kg-1 in three different growing regions of the Valley, while the highest levels in citrus fruits were 51.3 mg kg-1 in clementines ( Citrus mitis ) and 49.4 mg kg-1 in the lemon ( Citrus limon ). As the latter values were on a dry weight basis, the risk of lithium toxicity would appear to be minimal but, equally important, deficiency syndromes should not be manifest either.
