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OCR for page 44
44 Name: SODIUM CHLORITE CAS No.: 7 758 -19-2 Chemical Formula: NaClO2 Description: NAS/CWTC 019-82 Formula Weight: 90.5 Tan or white crystals or powder that are hydroscopic. This powerful oxidizing agent is explosive on contact with organic matter. It has a solubility in water of 39 g/100 ml at 17C and is available at a commercial strength of 81.0-98.5% sodium chlorite. Use: Used for on-site production of chlorine dioxide. AL irements: The RMIC values are based on a maximum dosage of 10 mg of sodium chlorite/liter of water and are to be compared to impurity concentrations obtained by using sample proce- dures 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 Mercury Selenium Bulk Sample Collection: RMIC mg Impurity/kg Sodium Chlorite 20 100 Sample in accordance with Standard for Sodium Chlorite, AWWA B303-67, American Water Works Association, Denver, Colorado (1967).

OCR for page 44
45 Analytical Sample Preparation: Pour 100 ml of sodium chlorite into a 150-ml acid-washed beaker. Under a hood, acidify the sample with concen- trated HNO3 to a pH of less than 2. Gently heat the solu- tion to reduce the volume below 100 ml, making certain that it does not boil. Quantitatively 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. For the mercury analysis, use a separate 100-ml aliquot of sodium chlorite. Repeat the same prep- aration. Sample Analyses: The analyses are to be performed on the sodium chlorite solution in accordance with: Standard Methods for the Examination of Water and Waste- water, 15th Edition, American Public Health Association, Washington, D.C. (1981). Selenium Mercury 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.