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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2010, Volume 61, Issue 10,





Angela Magda, Rodica Pode
Studies on Heat Treated Ammonium Phosphates with Boron

Abstract:

A fertilizer based on ammonium phosphate with 5% (w/w) boron was obtained by neutralization of phosphoric acid with ammonia solution. Boric acid was added into the reaction mass at a 1.5 NH3:H3PO4 molar ratio. The thermal analysis of the fertilizer obtained indicated an increase of thermal stability at temperatures above 475°C with increase of boron content. The X-ray diffraction of a heat treated sample indicated the appearence above 500°C of a single crystalline phase, boron orthophosphate, BPO4. Further investigations of the sample by infrared analysis, scanning electron microscopy (SEM) and energy-dispersive X-ray microanalysis (EDAX) confirmed the results of X-ray diffraction. The formation of BPO4 explains the increase of thermal stability at temperatures above 475°C. A new method of obtaining boron orthophosphate, by calcination of the fertilizer based on ammonium phosphate and boron added as boric acid was suggested. Keywords: boron, boron orthophoshate, fertilizer, amonium phospshate, micronutrient


Issue: 2010, Volume 61, Issue 10
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