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OCR for page 38
38 Name: POTASSIUM PERMANGANATE CAS No.: 7722 - 64 - 7 Chemical Formula: KMnO4 Descrintion: NAS/CWTC O. 16-82 Formula Weight: 158 . O A dark purple crystal with a blue metallic sheen, having a sweetish, astringent taste and no odor. It has a Volubility in water of 5.0 g/100 ml at 20C and is available at a commercial strength of 97-99% potassium permanganate. Use: Used as an oxidant for removal of iron or manganese and for treatment of taste and odor. Purity Requirements: The RMIC values are based on a maximum dosage of 10 mg of potassium permanganate/liter of water and are to be compared to impurity concentrations obtained by using sample procedures described in this monograph. If the actual dosage is other than 10 mg/liter, the user is cautioned to consult Table 2 for appropriate RMIC values. Impurity Cadmium Chromium Mercury Bulk Sample Collection: RMIC mg Impurity/kg Potassium Permanganate 100 500 20 Sample in accordance with Standard for Potassium Perman- ganate, AWWA B603-77, American Water Works Association, Denver, Colorado (1977).

OCR for page 38
39 Analytical Sample Preparation: Weigh out 2.5 g of potassium permanganate. In a 150-ml acid-washed beaker, dissolve the sample with 100 ml of deionized distilled water. Under a hood, acidify the solution with concentrated HC1 to a pH of less than 2. Add hydroxylamine hydrochloride until the solution turns clear. Gently heat the solution to reduce the volume below 100 ml, making certain that it does not boil. Quantitively transfer to a 100-ml acid-washed volumetric flask and make to volume with deionized distilled water. Process a reagent blank by the same procedure. Sample Analyses: The analyses are to be performed on the potassium permanganate solution in accordance with: Standard Methods for the Examination of Water and Waste- water, 15th Edition, American Public Health Association, Washington, D.C. (1981). Cadmium Chromium Mercury Section 304 Section 304 Section 303F All products used for disinfection that contain this compound must be registered as prescribed by Federal Insecticide, Fungicide and Rodenticide Act.