Abstract
The present work was carried out to study effectiveness of phosphate rocks discomposing by using two rapid digestion methods (single and mixed acids). A rapid method for determining P2O5 of phosphate rocks based on colorimetry has been determined. The loss on ignition (L.O.I) method's values is ranging between 8.80% to 25.25% for Jebel Kurun and between 13.84% to 18.78 % for Uro. The comparison between determination total and available phosphorus with single digestion (HClO4) and "mixed acids" (HCl, HNO3, and HClO4) showed that the total phosphorus measured by single digestion ranged between 31.51% and 44.62% of Krurn and between 27.60% and 28.52% of Uro areas. By the mixed acids method it was found to range from 19.32, to 48.30% P2O5 and 21.85% to 33.20% of Kurun and Uro respectively. The available P2O5 was ranged between 14.3 to 23.90% P2O5 of Nuba Mountaians Jebel Kurun and between 11.10% to 18.60% for Uro area.. A comparison of methods used for colorimetric determination of total P2O5 indicated that the results by mixed digestion method is the highest. The production its make appear to have very promising practical application.