Nitrate is one of the most common inorganic groundwater contaminants throughout the world. A high nitrate concentration in drinking water can cause methemoglobinemia in infants and in the stomach in adults (Gatseva & Argirova, 2008; Lee, Dahab, & Bogardi, 1992; Wolfe & Patz, 2002). The World Health Organization (WHO) has set the standard nitrate level in drinking water to 50 mg NO3~/L(=11.29 mg N/L) (WHO, 2008), while the federal standards of both the U.S. and China are 10 mg N/L (Ministry of Health of the People's Republic of China, 2006; U.S. Environmental Protection Agency [U.S. EPA], 2002). Ammonia in drinking water is not of immediate health relevance, and thus no health-based guideline value is suggested. Ammonia is, however, an indicator of possible bacterial, sewage, and animal waste pollution (WHO,2008)
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机译：硝酸盐是全世界最常见的无机地下水污染物之一。饮用水中的硝酸盐浓度高会导致婴儿和成人胃中的高铁血红蛋白血症（Gatseva和Argirova，2008; Lee，Dahab和Bogardi，1992; Wolfe和Patz，2002）。世界卫生组织（WHO）已将饮用水中的硝酸盐标准含量设定为50 mg NO3〜/ L（= 11.29 mg N / L）（WHO，2008），而美国和中国的联邦标准均为10 mg N / L（中华人民共和国卫生部，2006年;美国环境保护署[US EPA]，2002年）。饮用水中的氨与健康没有直接关系，因此没有建议基于健康的准则值。但是，氨是可能的细菌，污水和动物废物污染的指标（世卫组织，2008年）
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