A New Procedure for the Determination of Chromic Oxide with Potassium Phosphate Reagent

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Abstract
Chromic oxide (Cr2O3) is used as an index in the research works on digestion and metabolism with chickens and other animals. During the nutritional studies on minerals in milk, one of the authors found that inert Cr2O3 heated with milk ash became watersoluble. Accordingly, studies to find out the effective chemicals in milk ash and to establish a new analytical procedure for the determination of Cr2O3 with these chemicals were carried out. It was found that the absorption curve of Cr2O3 in the poultry feed and excreta treated by the following procedure with potassium phosphate and potassium hydroxide was identical to that of CrO4". No factors in common poultry feed and excreta was found to affect the accuracy of Cr2O3 determination. New Procedure 1. Reagent: 50g of K3PO4 and 25g of KOH are solved with distilled water into 100ml. 2. Sample containing approximately 1.5mg of Cr2O3 is weighed into crucible. 3. One ml of reagent solution is added to the sample, mixed and burned for carbonization. If necessary, dry the sample-reagent mixture before the carbonization. 4. Sample-reagent mixture is heated in an electric oven at 800°C for 30 minutes. 5. After cooling, the mixture is solved with distilled water, transferred into volumetric flask, filled up to 250ml. and left overnight. 6. The solution is filtered off and optical density of the solution is determined with ultraviolet ray of 370mμ.

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