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Introduction To Nitrate Hazards
- Jul 21, 2017 -

Nitrate (NO3-) and nitrite (NO2-) are the acid radicals of nitric acid (HNO3) and nitrous acid (HNO2), which are widely present in nature as environmental pollutants, especially in gaseous water, surface water And groundwater as well as animals and plants and food. Nitrate and nitrite are polluted in the environment. 1 kilogram of waste manure composting under natural conditions by leaching decomposition, can produce 492 milligrams of nitrate; 3. Food, fuel, oil refining and other factories to discharge a large number of raw materials, 4, cars, trains, ships, aircraft, boilers, civil furnaces and other combustion of petroleum fuels, coal, natural gas, can produce large amounts of nitrogen oxides, such as nitrogen, The average burning of 1 ton of coal, 1 thousand liters of oil and 10,000 cubic meters of natural gas can produce nitrogen dioxide gas 9,13 and 63 kg, respectively, these nitrogen dioxide gas leaching can form nitrate fall to the ground and water 5. Food preservative and preservation: Nitrate and nitrite are widely used in the preservation and preservation of meat and fish, so that meat products show red and fragrance, in every kilogram of meat Into nitrite (typically sodium nitrite) 5 mg or less, the flesh over time a good appearance; was added 20 mg of the above, the desired color can be rendered stable commercially; there was added 50 mg of odor. The following are the same as the "

The use of chemical fertilizers in the environment, sewage irrigation, waste feces, industrial nitrogen wastes, fuel combustion emissions of nitrogen and other waste gas in natural conditions, the precipitation after leaching decomposition of nitrate, into the river, lake and infiltrated the ground, resulting in Nitrate contamination of surface water and groundwater. Such as sewage infiltration, sewage irrigation and exogenous fertilizer can make the groundwater nitrate content from a few milligrams / liter surge to 400 mg / l or more (national drinking water nitrate content of health standards less than 88.6 mg / l, less than nitrogen 20 mg / l); excessive use of chemical fertilizers, sewage irrigation, nitrate-contaminated water sources also allow crops to absorb a large number of nitrate, such as excessive fertilization of spinach produced per kilogram of dry weight can contain nitrite up to 3600 Mg. There are also pickled sauerkraut, long-distance transport and long-term storage of vegetables and overnight cooked vegetables not only a substantial increase in nitrate content, and in the role of nitrate-reducing bacteria, nitrate was reduced to nitrite. The following are the same as the "

The above contains a lot of nitrate and nitrite water, vegetables, food, fish, meat products, sauerkraut, overnight cooking and other people after eating, a large number of nitrite can make people directly poisoning, and nitrate in the human body can also Was reduced to nitrite. Nitrite and human blood, the formation of methemoglobin, so that the loss of oxygen carrying oxygen function, people hypoxia poisoning, light dizziness, palpitations, vomiting, lips bruising, severe confusion, convulsions, shortness of breath, rescue Not in time can be life-threatening. Not only that, nitrite in the human body and the role of secondary amine formation of nitrosamines, it reaches a certain dose in the human body is carcinogenic, teratogenic, mutagenic substances, can seriously endanger human health. In order to prevent the harm of nitrate and nitrite, in addition to scientific and rational use of chemical fertilizers, prohibit the use of sewage irrigation, the implementation of sewage, garbage and fecal harmless treatment and other environmental protection measures to protect surface water and groundwater sources do not suffer from nitrate and Nitric acid pollution, but also should try to eat pickled, smoked, waxy fish, meat, sausage, bacon, ham, canned food, pickled sauerkraut, salted near the dish; do not buy too long, Do not eat overnight cooked vegetables; can not be long-term storage of leftovers; not with industrial nitrite (such as sodium