STABILITY OF UREA SOLUTIONS IN PRESENCE OF BUFFERING ADDITIVES
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2021-01-01
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Abstract
The stability of urea water solutions, containing 20 % nitrogen in presence of phosphates: [(NH4H2PO4+ (NH4)2HPO4], [KH2PO4+K2HPO4] and citric buffering additives: potassium citrate, citric acid and glycine has been studied. The study was carried out at temperature 298.15 K for a period of 150 days by periodic measurement of the electrical conductivity and pH of solutions. It was found that the most suitable composition for liquid fertilizer among the urea water solutions with additives of citrate buffers is the urea solution with additive of citric acid as well as mixture of citric acid and glycine. A possibility was shown to study the behavior of urea solutions through periodical measurement of two very easy to register and very precise parameters - pH and conductivity during the prolonged storage and the possibility for stabilizing of these solutions.