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硒是一种必需元素,但饮食中的硒超过极限时则产生毒性。关于饮水中摄取的亚硒酸盐的毒性尚未肯定。Hadjimarkos等报告硒可导致龋齿的发病率增高。Beath报导了一起人类水源性硒中毒的情况。印第安族人在整整3个月中摄取了含9mg/l的硒后,出现脱发以及指甲脆裂,但Rosenfeld等报导,该族儿童在停止饮用高硒水后神经过敏者增多。Smith等报导了在土壤含硒量高的地区,出现胃肠道不适,牙齿损害以及黄胆样肤色。患有症状者尿硒为0.2～1.98mg/l,Glove报告正常尿硒范围为0.0～0.15 mg/l。
Selenium is an essential element, but selenium in the diet exceeds its limit and produces toxicity. The toxicity of selenite uptake in drinking water is not yet known. Hadjimarkos et al reported selenium can cause an increased incidence of dental caries. Beath reports a human selenium poisoning situation. Indians also developed hair loss and nail embolism after consuming 9 mg / l of selenium for three full months, but Rosenfeld et al. Reported that there was an increase in allergies among children of this tribe after stopping drinking high-selenium water. Smith et al. Reported gastrointestinal upset, tooth damage and yellowish-bones appearance in areas with high selenium levels in the soil. Urinary selenium in patients with symptoms of 0.2 ~ 1.98mg / l, Glove reported normal urine selenium range of 0.0 ~ 0.15 mg / l.