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美国环境保护局(EPA)制订了公共给水系统饮水中硝酸盐的最高容许量为10 mg/lNO_3-N,这一限量主要是针对三月龄以下的婴儿以防止婴儿高铁血红蛋白(Met-Hb)症的发生因在一般情况下认为婴儿较成人在发生此症上则更为敏感,已报导的三月龄以下的病例,他们饮水中的NO_3-N含量往往超过了22 mg/l;另报导健康成人在饮用高硝酸盐含量的饮水后未见有明显反应。然而苏联发表的4篇报导指出,饮用高于10 mg/l NO_3-N饮水的学龄儿童,也可出现超过正常水平(1～2%)的Met-Hb。在美国未曾对青少年进行过高硝酸盐饮水的影响研究,为此本研究拟对伊利诺斯
The United States Environmental Protection Agency (EPA) has developed a public drinking water system in drinking water nitrate maximum allowable 10 mg / lNO_3-N, the limit is limited to infants under 3 months of age to prevent infant methemoglobin (Met-Hb) Occurrence of the disease is generally considered to be more sensitive to infants than adults. Cases of infants younger than three months often report a> 22 mg / l increase in NO3-N levels in their drinking water; another report Healthy adults in the drinking of high nitrate content of drinking water no significant reaction. However, four reports published in the USSR indicate that Met-Hb in excess of normal levels (1-2%) may also occur in school-age children drinking more than 10 mg / l NO_3-N drinking water. In the United States did not have a study on the impact of drinking water of high nitrate, for this study intended to Illinois