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OCR for page 18
18 Name: CALCIUM HYPOCHLORITE CAS No.: 7778-54-3 Chemical Formula: Ca(OCl)2 Description: NAS/CWTC 006-82 Formula Weight: 143.1 A white or yellowish-white powder with a strong chlorine odor; hydroscopic and corrosive. It is available at a commercial strength of 70% available C12. Use: Used for disinfection, color removal, iron and manganese removal, and taste and odor control. Purity Requirements: The RMIC values are based on a maximum dosage of 20 mg of calcium hypochlorite/liter of water and are to be com- pared to impurity concentrations obtained by using sample procedures described in this monograph. If the actual dosage is other than 20 mg/liter, the user is cautioned to consult Table 2 for appropriate RMIC values. RMIC mg Impurity/kg Impuritv Calcium Hynochlorite Mercury Bulk Sample Collection: 10 Sample in accordance with Standard for Calcium Hypochlo- rite, AWWA B300-80, American Water Works Association, Denver, Colorado (1980).

OCR for page 18
19 Analytical Sample Preparation: Weigh out 2.5 g of calcium hypochlorite. In a 150-ml acid-washed beaker dissolve the sample in 100 ml of deionized distilled water. Under a hood, acidify the solution with concentrated HNO3 to a pH of less than 2. Gently heat the solution to reduce the volume below 100 ml, making certain that it does not boil. Quanti- tatively 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 calcium hypochlo- rite solution in accordance with: Standard Methods for the Examination of Water and Waste- water, 15th Edition, American Public Health Association, Washington, D.C. (1981). Mercury Section 303F All products used for disinfection that contain this compound must be registered as prescribed by the Federal Insecticide, Fungicide and Rodenticide Act.