Mesalamine, USPTest Specification Min Max ASSAY (DRIED BASIS) 98. 5 101. 5 % CLARITY OF SOLUTION TO PASS TEST TO PASS TEST pH (1 in 40 suspension) 3. 5 4. 5 LOSS ON DRYING 0. 5 % RESIDUE ON IGNITION 0. 2 % CHLORIDE 0. 1 % SULFATE 0. 2 % HYDROGEN SULFIDE AND[nSULFUR DIOXIDE TO PASS TEST TO PASS TEST Content of 3 Aminosalicylic Acid and other Related Impurities TO PASS TEST TO PASS TEST Content of Aniline, 2 Aminophenol and 4 Aminophenol TO PASS TEST TO PASS TEST