1977年的美国饮用水标准未列入钠最高限量浓度,当时环保局认为缺乏足够的人群调查资料。美国心脏学会建议采用钠最高限量20mg/l 作为标准,以保护高危险人群特别是心、肾疾病患者。美国科学院1977年建议钠标准不超过100mg/l,以保证经饮水摄入的钠 The 1977 U.S. drinking water standard did not include the maximum sodium concentration, at which time the EPA considered the lack of sufficient population survey data. The American Heart Association recommends a sodium maximum of 20 mg / l as a standard to protect people at high risk, especially those with heart and kidney disease. American Academy of Sciences in 1977 recommended that sodium should not exceed 100mg / l, in order to ensure sodium intake by drinking water