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含硝酸盐氮10毫克/升左右的深井水在新镀锌钢管中停留隔夜后,由于锌与硝酸盐的氧化-还原反应,使水中亚硝酸盐氮含量升高零点几毫克/升。然而,白天在管道的流动水中,并无明显的升高。含硝酸盐氮12.0毫克/升的自来水在实验室条件下,接触新镀锌钢管8小时、生成0.34毫克/升亚硝酸盐氮。现场和实验条件下生成的亚硝酸盐氮含量低于文献中建议的1毫克/升,仍可作为饮用水。随着水管使用年限的增加,此现象将逐渐消失。新镀锌钢管中放出的隔夜水可不用于喂养几个月的婴儿。
Deep well water containing about 10 mg/l of nitrate nitrogen stayed overnight in the new galvanized steel pipe, and the nitrite nitrogen content in the water rose by a few milligrams/liter due to the oxidation-reduction reaction of zinc and nitrate. However, there was no significant increase in flowing water in the pipeline during the day. The tap water containing nitrate nitrogen 12.0 mg/l was exposed to the new galvanized steel pipe for 8 hours under laboratory conditions to produce 0.34 mg/L of nitrite nitrogen. The nitrite nitrogen content produced under field and experimental conditions is lower than the 1 mg/l recommended in the literature and can still be used as drinking water. With the increase of the service life of water pipes, this phenomenon will gradually disappear. The overnight water released in the new galvanized steel pipe may not be used to feed infants for several months.