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ELECTRICAL discharges in the atmosphere during storms produce traces of nitric acid and nitrous acid. In the soil, nitrates and nitrites are also formed by the action of nitrifying bacteria and by the oxidation of organic nitrogen compounds. Sodium nitrate, NaN0 3 (Chile saltpetre), occurs in nature in large amounts. Potassium nitrate (KN0 3 ) and calcium nitrate [Ca(N0 3 ) 2 ] also occur naturally. Nitric acid and other nitrates are produced in large amounts in industry as propellants, chemical fertilizers and materials for chemical industry. Nitrites are used in the dye industry and organic chemical industry. Considerable amounts of nitric acid, nitrates and nitrites are used for the surface treatment of metals.Dissolution of the sample. The normal nitrates of all the common metals are soluble in water. Some basic metal nitrates and organic nitrates are insoluble in water. Some insoluble complex nitrites are known, e.g. K 2 CuPb(N0 2 ) e , K 3 Co(N0 2 ) e , K 2 CaNi(N0 2 ) 6 etc. These can usually be decomposed, however, by boiling with sodium carbonate.Forms of determination. Nitrite ions are usually determined by titrimetric or colorimetric methods. The most accurate determination of TABLE 55.1. Forms of determination of nitrogen (for References see p. 121) Ref. number
ELECTRICAL discharges in the atmosphere during storms produce traces of nitric acid and nitrous acid. In the soil, nitrates and nitrites are also formed by the action of nitrifying bacteria and by the oxidation of organic nitrogen compounds. Sodium nitrate, NaN0 3 (Chile saltpetre), occurs in nature in large amounts. Potassium nitrate (KN0 3 ) and calcium nitrate [Ca(N0 3 ) 2 ] also occur naturally. Nitric acid and other nitrates are produced in large amounts in industry as propellants, chemical fertilizers and materials for chemical industry. Nitrites are used in the dye industry and organic chemical industry. Considerable amounts of nitric acid, nitrates and nitrites are used for the surface treatment of metals.Dissolution of the sample. The normal nitrates of all the common metals are soluble in water. Some basic metal nitrates and organic nitrates are insoluble in water. Some insoluble complex nitrites are known, e.g. K 2 CuPb(N0 2 ) e , K 3 Co(N0 2 ) e , K 2 CaNi(N0 2 ) 6 etc. These can usually be decomposed, however, by boiling with sodium carbonate.Forms of determination. Nitrite ions are usually determined by titrimetric or colorimetric methods. The most accurate determination of TABLE 55.1. Forms of determination of nitrogen (for References see p. 121) Ref. number
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