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亚硝酸盐和硝酸盐广泛存在于土壤、水域及植物中,如绿色蔬菜中的甜菜、莴苣、菠菜、芹菜及萝卜等硝酸盐含量较高,硝酸盐在某些细菌的还原作用下可变成亚硝酸盐。目前广泛采用的含氮农药、化学氮肥及含氮工业废水、废渣对环境土壤和水造成污染,使蔬菜中亚硝酸盐含量不断增加。而
Nitrite and nitrate are widely present in soils, waters and plants, such as beet, lettuce, spinach, celery and radish in green vegetables. Nitrates are highly nitrate-reducible under the action of certain bacteria Nitrite. Currently widely used nitrogen-containing pesticides, chemical nitrogen fertilizer and nitrogen-containing industrial waste water, waste residue on the soil and water polluted the environment so that the vegetable nitrite levels continue to increase. and