prov:value
| - Ammonia may be replaced by ammonia furnishing ammonium salts; such salts are, for example, ammonium monohydro-gen phosphate, which may be used under pressure and at an elevated temperature, or ammonium nitrate, whereby a salt, such as, for example, an alkaline earth metal, e.g. calcium and the like, salt or an alkali metal, e.g. sodium, potassium and the like, salt of the cyanamide starting materi
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