Abstract

>Adam A. Farah¹, Salah M. Nour², Alassam H. Ahmed³ and H. Bayahia³

DOI : http://dx.doi.org/10.13005/ojc/320520

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.

phosphate rocks; mixed digestion method; total phosphorus

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