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SOLUBILITY INSOLUBLE IN WATER IDENTIFICATION A IR ABSORPTION SPECTRUM IDENTIFICATION B TO COMPLY ACIDITY / ALKALINITY TO COMPLY P-TOLUENE SULFONAMIDE < 10 PPM O-TOLUENE SULFONAMIDE < 10 PPM BENZOATE AND SALICYLATE NO PRECIPITATE OR VIOLET COLOUR APPEARS HEAVY METALS NMT 0.001 % IRON CONTENT NMT 5 ppm READILY CARBONIZED SUBSTANCES NOT MORE INTENSELY COLOURED THAN REFERENCE pH VALUE 7.0 ASSAY ON ANHYDROUS BASIS 98.5 % TO 101 % MELTING POINT 226 0C - 230 0C DESCRIPTION WHITE POWDER