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Nitrogen is an essential nutrient for plants, which it draws from the soil in the form of nitrate or ammonium. Therefore, adding to the soil for cultivation of crops as fertilizer. The practice of nitrogen fertilizer is started early fifties, and amounts that were used culminated in early nineties.
Then it was realized that the soil contamination, and consequently watercourses, nitrites in fact a serious environmental problem. After washing the soil nitrate concentrations in surface waters have risen, and that contributed to the septic tank built out of standards and regulations, weak pretreatments sewage before discharge into surface waters, as well as intensive boiling water livestock production and the amount of faecal waste generated in this way.
Nitrates and nitrites are compounds having a nitrogen atom bound to an oxygen atom, including the nitrates have attached three atoms of oxygen, nitrite and two oxygen atoms. In nature nitrates and nitrites boiling water easily pass from one form to another. Both compounds are anions which means ions with a negative charge. They have a tendency to bind to the cations in order to achieve a neutral balance. Nitrates are primarily used as a fertilizer, but also in the processes of production of glass or explosives, and the various processes of chemical production and separation. Nitrites are produced mainly as a component of the feed additive, and both compounds are specifically used in the meat industry for maintaining the color of meat and overtime durability of cured meats.
Nitrate is a white crystalline salt is added as a preservative most commonly in the form of sodium nitrate boiling water (NaNO3, E 251) and potassium nitrate (KNO3, E252). The main source of nitrate in food is vegetables, and the accumulation of nitrate in vegetables is influenced by a number of factors such as type and amount of nitrogen fertilizers, geographical location and time of ripening, as well as conditions such as temperature and light. The amount of nitrates is different in different parts of the plant and has them most in the stems and stalk plants, slightly less in the leaves and roots and at least in the flower and fruit. boiling water
Nitrates occur naturally in soils, waters and plants, and small amounts are also detected in the air (1-40 mg / m3) as a result of air pollution. Nitrites are formed in the nature of the action of the nitrification bacteria as the compound in the formation of nitrate, but the concentration in water and plants are usually very low. However, the microbial conversion of nitrate to nitrite can occur during storage of fresh vegetables, especially at room temperature when the concentration of nitrite can reach very high levels and up to 3600 mg / kg of dry matter. And nitrates and nitrites are used in many production and storage of cured meats, and some fish products. Maintain a nice red bojumesa and stabilize the flavor of stored dried products.
The use of nitrate and nitrite is governed by laws, and most are used to prevent botulism ie. The growth of Clostridium botulinum boiling water type that as a product of their metabolism produces botulinum toxin. Clostridium botulinum is sometimes present in raw meat, and can survive the heat treatment. Nitrites as preservatives are added in the form of sodium nitrite (NaNO2, E250) and potassium nitrite (KNO2, E249), and the appearance of yellowish crystals which are readily soluble in water.
Animals boiling water eat plants and nitrates used for protein synthesis. Nitrates are then returned to nature through animal feces, and microbiological degradation of plants and animals after they die. Microorganisms can convert boiling water nitrate or ammonium ion (ie., A nitrogen atom bonded with four hydrogen atoms of NH 4) to nitrite, and the reaction takes place in nature as well as in the intestinal tract of humans boiling water and animals. Once the bacteria reduce boiling water nitrate to nitrite and then to nitrate nitrogen, closed the cycle of nitrogen cycling in nature.
Under normal conditions, this cycle does not lead to accumulation of nitrate or nitrite in nature, but human activities have significantly increased the concentration of the use of nitrogen boiling water fertilizers boiling water and intensive livestock production. Nitrates and nitrites boiling water are easily soluble in water and very mobile in the environment. They have a high potential for entering the surface boiling water water through precipitation, as well as in underground flushing agricultural soil treated with artificial fertilizers. boiling water The concentration in soils is
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