Nitrogen Ammoniacal

Ammonium nitrate fertilizer incorporates nitrogen in both of the forms taken up by crops ammonia and nitrate ion. Fertilizers (qv) containing only ammoniacal nitrogen are often less effective, as many important crops tend to take up nitrogen mainly in the nitrate form and the ammonium ions must be transformed into nitrate by soil organisms before the nitrogen is readily available. This transformation is slow in cool, temperate zone soils. Thus, ammonium nitrate is a preferred source of fertilizer nitrogen in some countries. 

The whole column, apart from a small portion of the sediment, is sam pled in this way. The chemical checks were carried out every 15 days, determining pH, Conductivity, C.O.D., Ammoniacal Nitrogen, Orthophosphate Phosphorus and, furthermore, each month Total phosphorus, Total Kjeldahl Nitrogen, Total Solids and Volatile Solids. The methods utilized are those indicated in the Standard Methods (A.P.H.A., 1980). The amount of matter particles sedimented in the tanks was estimated with the use ol appropriate sampling devices located at the bottom of the tanks and withdrawn after a variable permanence of 40 to 60 days. 

The following characteristics were analysed by standard methods (9) TS, volatile solids (VS), chemical oxygen demand (COD), Kjeldahl nitrogen (Kj-N) and ammoniacal nitrogen (NH3-N). The biochemical oxygen demand of whole slurry (BODw) was analysed by a dilution method (10). Volatile fatty acids (VFA) were analysed by gas... 

Ammoniacal Nitrogen 1.80% Nitrate Nitrogen 9.80% Urea Nitrogen... 

Complete conversion of organic nitrogen to ammoniacal nitrogen is essential to obtain accurate and precise results. After the liquid has become clear and colorless, i t may be necessary to digest the sample for an additional -30 to 50... 

England 0-97 mgrm. per litre of rain in the oountry, and 5-14 mgrms. in the towns and in Scotland, 0-53 mgrm. in the country, and 3-81 mgrms. in the town. Table V shows that ammoniacal nitrogen is usually in excess of nitric nitrogen, but the converse is true of tropical countries. The ammonia is usually collected by the acids—nitric, hydrochloric, or sulphuric—in the atmosphere and. carried to earth in rain or snow. 

Ammoniacal Nitrogen Iodide, See under Nitrogen Iodide... 

Mauricio, J. C., Ortega, J. M., and Salmon, J. M. (1995). Sugar uptake by three strains of Saccharomyces cerevisiae during alcoholic fermentation at different initial ammoniacal nitrogen concentrations. Acta Horticult. 388,197-202. 

In flooded or waterlogged soils, as for example, in a continuously flooded rice paddy, anaerobic (reducing) conditions exist in the soil below the surface, and hence nitrification of ammoniacal nitrogen does not occur in this layer. Therefore, when ammonia, ammonium salts, or urea (which hydrolyzes in the soil to... 

Sablayrolles, J.M., Dubois, C., Manginot, C., Roustan, J.L., Barre, P. (1996). Efectiveness of combined ammoniacal nitrogen and oxygen additions for completion of sluggish and stuck fermentation. J. Fermen. Bioeng., 82, 377-3S1... 

The quantity of NADH oxidised into NAD+ is proportional to the quantity of ammoniacal nitrogen present in the sample. 

All In mg/L except pH BOD, biochemical oxygen demand COD, chemical oxygen demand SS, suspended solid DS, dissolved soil TN, total nitrogen AN, ammoniacal nitrogen. 

Ammoniacal nitrogen can be determined by treatment of the sample with chloroplatinic acid the product is slightly soluble ammonium chloro-platinate ... 

Ammonia can enter the soil by direct application of fertilizers. Of the total U.S. production of anhydrous ammonia, 30% is applied directly to the soil under pressure (Kramer 2000). Approximately 80% of the U.S. production of ammonia is applied to soil in fertilizer formulations designed to release ammoniacal nitrogen. Application of natural fertilizers obtained from livestock excreta will also result in the release of ammonia to the soil (Asman et al. 1998 Beauchamp et al. 1982 Hoff et al. 1981 Olivier et al. 1998). High levels of ammonia in soils can result from the decomposition of animal wastes on cattle feedlots or other confinement areas. Ammonia in soil can also arise from the decay of organic material from plants and animals, etc. (Dawson 1977 Dawson and Farmer 1984). Microbial fixation of nitrogen from the atmosphere is a natural and continual source of ammonia in soil (Galbally 1985 National Science Foundation 1999). 

Ammonia may be present in air in both the vapor and particulate phase as ammonia gas and as ammonium salts. While analytical methods may distinguish between these phases, most standard methods do not. Methods have been developed that determine gaseous ammonia alone or gaseous and particulate forms of ammoniacal nitrogen separately. These methods use filter packs or sampling tubes coated with a selective adsorbent (denuder tube) to separate the phases (Dimmock and Marshall 1986 Knapp et al. 1986 Rapsomanikis et al. 1988). In these methods, gaseous ammonia is trapped by an adsorbent (e.g., citric acid, oxalic acid, phosphoric acid) on a coated filter or denuder tube (Kirchner et al. 1999). In filter methods, errors may arise due to ammonia interactions occurring on the filter and volatilization of retained ammonium salt (Dimmock and Marshall 1986 Rapsomanikis et al. 1988). 

Methods for Determining Parent Compounds and Degradation Products in Environmental Media. Methods for determining ammoniacal nitrogen in environmental media are well developed and adequate. Standardized methods are available from EPA, NIOSH, and other sources. Analytical methods are also well developed for oxidation products of ammonia. Since there are multiple sources of these compounds in the environment, their analysis is not generally used to study the disappearance of ammonia. 

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