File:Sievvert's apparatus for the conversion and analysis of nitric nitrogen to ammoniacal nitrogen (Alessandri 1895.32).png

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Sievvert's apparatus for the conversion and analysis of nitric nitrogen to ammoniacal nitrogen

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Description
Italiano: Per convertire un nitrato in ammoniaca gassosa ne si mette 1 g in un pallone A da 300-350 mL assieme a 4 g di limatura di ferro, 10 g di limatura di zinco o di alluminio, 16 g di idrossido di potassio KOH e 100 mL di etanolo al 95%. Spontaneamente, a freddo, inizia l'emissione di idrogeno gassoso, e il pallone viene riscaldato su una fiamma. Regolando la distillazione in modo che sia costante e lenta, in circa 30' tutto l'alcool distilla portando con sé l'ammoniaca, che viene assorbita in un pallone B da 150-200 mL contenente acido ossalico, preferibilmente refrigerato. Eventualmente si può aggiungere ancora un poco di alcool (15-20 mL) al pallone A per prolungare la distillazione. Al termine, il liquido raccolto viene titolato per determinare l'ammoniaca emessa.
English: To convert a nitrate into gaseous ammonia it can be placed (1 g) in a 300-350 mL round-bottom flask A with 4 g iron filings, 10 g zinc or aluminum filings, 16 g potassium hydroxide KOH, and 100 mL of 96% ethanol. After a short while, hydrogen starts bubbling, and the solution is heated. With aid of a flame, the solution is slowly distilled over the course of 30' and the distillate is collected in a 150-200 mL cooled flask B with a known amount of oxalic acid. If the distillation is too quick, some more 15-20 mL ethanol can be added. At the end, the solutions in B and C are collected and titrated to determine the ammonia produced by the sample.
Date
Source Alessandri, P. E. Analisi Volumetrica Applicata Ai Prodotti Commerciali e Industriali; Ulrico Hoepli: Milano, 1895.
Author valeg96

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