Análise da concentração de fósforo em fertilizante map através de extrações em água, cna e total

Abstract

Monoammonium phosphate (MAP) is a fertilizer of mineral origin, which by presenting phosphorus in its chemical formula, is quickly absorbed by plants. The phosphorus content present in this fertilizer can be obtained by methods described in a manual used by the Ministério da Agricultura, Pecuária e Abastecimento (MAPA) to inspect the quality of products, indicated by its legal guarantee. In these methods, different extractors are used to solubilize the phosphorus element, which simulates its absorption by the plant. Thus, an opportunity was seen to contribute to research in this area, carrying out three types of phosphorus extractions in an MAP. The extractors used in this work were water, the aqueous solution of neutral ammonium citrate and acids. The aim was to obtain the phosphorus concentrations of this fertilizer in three different ways, so that they could be compared to each other and see if they fit within the range of values indicated by the guarantee. Therefore, a data collection was carried out that helped in the development of the analyzes and in the calculations. The results indicated that through the extraction in water the fertilizer has a content of 51.37% of P2O5 , by extraction with an aqueous solution of neutral ammonium citrate, a content of 51.78% of P2O5 and through total extraction, a content of 53.02% of P2O5, so the fertilizer met the tolerance value allowed by MAPA, which are between 48 to 55% of P2O5 and the values obtained in each type of extraction were consistent with what the literature says, since they are smaller in the extractions with water and aqueous solution of neutral ammonium citrate than in the total extraction, where all forms of phosphorus present are indicated.