Fertilizers. Determination of nitric and ammoniacal nitrogen according to Ulsch

2007 ◽  
Keyword(s):  
Ammoniacal Nitrogen

A new method for the determination of ammoniacal nitrogen in soils

1924 ◽  
Vol 14 (4) ◽  
pp. 548-554 ◽  
Author(s):  
W. McLean ◽  
G. W. Robinson
Keyword(s):  
Sodium Chloride ◽  
New Method ◽  
Ammoniacal Nitrogen ◽  
Cent Solution ◽  
Base Exchange ◽  
Exchangeable Bases ◽  
Cent Sodium ◽  
Leaching Solution ◽  
Ammonium Compounds

A method for the determination of ammoniacal nitrogen in soils is described. It is an extension of the Hissink method for exchangeable bases to ammonium present in the soil. The working details are similar to the Hissink method, except that the leaching process is entirely carried out in the cold. The ammonia is distilled off with magnesium oxide.Using normal sodium chloride as a leaching solution and collecting half a litre of leachings for distillation with magnesia, results were obtained which showed excellent agreement with those by the aeration method. Similar results were obtained using 250 c.c. of 15 per cent, sodium chloride solution, but the results are on an average about 1·6 per cent, lower. With high proportions of ammoniacal nitrogen a second half litre of normal sodium chloride leachings should be taken, or half a litre of 15 per cent, solution used.The leaching method is economical of apparatus and water supply. It is therefore suitable for small laboratories with limited resources. It is fairly rapid: six estimations can be completed in a day.The close agreement of the new method with the aeration method suggests that the amount of ammoniacal nitrogen in the soil at any given time is not an arbitrary quantity depending on conditions of estimation, but a definite amount. It is improbable that any ammonium compounds exist in the soil apart from those which take part in base exchange.

Green analytical method for simultaneous determination of salinity, carbonate and ammoniacal nitrogen in waters using flow injection coupled dual-channel C4D

Talanta ◽  
2018 ◽  
Vol 189 ◽  
pp. 196-204 ◽  
Author(s):  
Sumonmarn Chaneam ◽  
Prawpan Inpota ◽  
Suttipong Saisarai ◽  
Prapin Wilairat ◽  
Nuanlaor Ratanawimarnwong ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Flow Injection ◽  
Analytical Method ◽  
Ammoniacal Nitrogen ◽  
Dual Channel

Formaldehyde Titration Method for the Determination of Ammoniacal Nitrogen in Phosphate Fertilizers

1975 ◽  
Vol 58 (6) ◽  
pp. 1194-1196
Author(s):  
T S R Anjaneyulu
Keyword(s):  
Rapid Analysis ◽  
Distinct Advantage ◽  
Formaldehyde Solution ◽  
Ammoniacal Nitrogen ◽  
Distillation Method ◽  
Phosphate Fertilizers ◽  
Titration Method ◽  
Initial Ph ◽  
Kjeldahl Method

Abstract The present formaldehyde titration method, applicable to ammonium nitrate and ammonium sulfate samples, has been improved for the analysis of ammoniacal nitrogen in phosphate fertilizers. Samples of 14-35-14 and 28-28-0 fertilizers are analyzed by the improved formaldehyde titration method and the results are compared with the Kjeldahl distillation method. The formaldehyde method is applicable for 14-35-14 and 28-28-0 fertilizer samples, provided the initial pH of the sample solution is adjusted to pH 7.7 prior to the addition of neutral formaldehyde solution. For the analysis of samples of phosphate fertilizers of the same grade, the improved formaldehyde method offers a distinct advantage over the Kjeldahl method, and can be used for the rapid analysis of process control samples.

Determination of Ammoniacal and Total Nitrogen in Fertilizers by Ammonia-Selective Electrode

1984 ◽  
Vol 67 (5) ◽  
pp. 890-892
Author(s):  
Roberto A Navarro ◽  
Pedro Rojas
Keyword(s):  
Tartaric Acid ◽  
Magnesium Oxide ◽  
Total Nitrogen ◽  
Ammoniacal Nitrogen ◽  
Selective Electrode ◽  
Digestion Procedure ◽  
Acid Recovery ◽  
Aoac Official ◽  
Good For

Abstract A method was studied for determining ammoniacal nitrogen in fertilizers by using an ammonia-selective electrode. Recovery for the method was evaluated with synthetic samples, and the method was also compared with the magnesium oxide method by analyzing 3 Magruder Check Samples. The method was adapted to determine total nitrogen in fertilizers by using the digestion procedure of the modified comprehensive nitrogen method and eliminating metal interferences by forming soluble complexes with tartaric acid. Recovery was evaluated and a comparison with AOAC official methods was made by performing a /-test on results for 3 Magruder Check Samples. Recoveries were good for determinations of both ammoniacal and total nitrogen by the method described, and results were not significantly different from those for AOAC methods.

scholarly journals A rapid method for determination of nitrate, nitrite, and ammoniacal nitrogen in soils

1975 ◽  
Vol 42 (1) ◽  
pp. 305-308 ◽  
Author(s):  
K. L. Sahrawat ◽  
Rajendra Prasad
Keyword(s):  
Rapid Method ◽  
Ammoniacal Nitrogen
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