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When we eat nitrates, they are converted into nitrites in our digestive system, which are then converted to ammonia and disposed of by the body. Nitrites are also inorganic compounds made up of nitrogen and oxygen, but instead of three oxygen molecules they have two, NO2. Nitrates are not generally harmful unless they are consumed in massive quantities. Nitrites, on their own and in moderation, are also generally not harmful.
Nitrates in the soil, derived from dead organic matter by bacterial action (see nitrification, nitrogen fixation), are absorbed and synthesized into complex organic compounds by plants and reduced to nitrates again when the plants and the animals feeding on them die and decay. nitrogen dioxide.