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Determination of the ammoniacal nitrogen and of the ammoniacal and nitrate nitrogen in fertilisers. Table of the weighing, dilution and calculation to be carried out for each of the variants (a), (b) and (c) of the method.
Variant (a), — | Approximate maximum quantity of nitrogen to be distilled = 50 mg |
Sulfuric acid 0.05 M to be placed in the receiving flask = 50 ml | |
Titration with sodium or potassium hydroxide, 0.1 M solution |
Declaration N% | Amount to be weighed (g) | (Volume) Dilution (ml) | Volume of sample solution to be distilled (ml) | Factor F |
---|---|---|---|---|
0 – 5 | 10 | 500 | 50 | 0.14 |
5 – 10 | 10 | 500 | 25 | 0.28 |
10 – 15 | 7 | 500 | 25 | 0.40 |
15 – 20 | 5 | 500 | 25 | 0.56 |
20 – 40 | 7 | 500 | 10 | 1.00 |
Variant (b), — | Approximate maximum quantity of nitrogen to be distilled = 100 mg |
Sulfuric acid 0.1 M to be placed in the receiving flask = 50 ml | |
Titration with sodium or potassium hydroxide, 0.2 M solution |
Declaration N% | Amount to be weighed (g) | (Volume) Dilution (ml) | Volume of sample solution to be distilled (ml) | Factor F |
---|---|---|---|---|
0 – 5 | 10 | 500 | 100 | 0.14 |
5 – 10 | 10 | 500 | 50 | 0.28 |
10 – 15 | 7 | 500 | 50 | 0.40 |
15 – 20 | 5 | 500 | 50 | 0.56 |
20 – 40 | 7 | 500 | 50 | 1.00 |
Variant (c), — | Approximate maximum quantity of nitrogen to be distilled = 200 mg |
Sulfuric acid 0.25 M to be placed in the receiving flask = 35 ml | |
Titration with sodium or potassium hydroxide, 0.5 M solution |
Declaration N% | Amount to be weighed (g) | (Volume) Dilution (ml) | Volume of sample solution to be distilled (ml) | Factor F |
---|---|---|---|---|
0 – 5 | 10 | 500 | 200 | 0.175 |
5 – 10 | 10 | 500 | 100 | 0.350 |
10 – 15 | 7 | 500 | 100 | 0.500 |
15 – 20 | 5 | 500 | 100 | 0.700 |
20 – 40 | 5 | 500 | 50 | 1.400 |
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