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23 Name: CARBON, ACTIVATED, GRANULAR CAS No.: 7440-44-0 Chemical Formula: C Descrintion: NAS/CWTC 008-82 Formula Weight: 12.0 Black granular solid with enormous surface area; insol- uble in water. Use: Adsorption and removal of color, odor, and other soluble substances from water. Purity Requirements: The RMIC values are based on a maximum dosage of 200 mg of activated carbon/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 200 mg/liter, the user is cautioned to consult Table 2 for appropriate RMIC values. Impurity Arsenic Chromium Lead Mercury Silver Bulk Sample Collection: RMIC mg Impurity/kg Activated Carbon 30 30 30 1 30 Sample in accordance with Standard for Granular Activated Carbon, AWWA B604-74, American Water Works Association, Denver, Colorado (1974).
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24 AnalvEical Sample Preparation--Extraction Solution: Add 47 ml of 0.1 N sodium hydroxide to 100 ml of 0.1 M potassium hydrogen phthalate and dilute with deionized water to 200 ml. Resultant solution will have a pH of 5 + 0.05. Weigh 5 g of GAC into a 400-ml beaker. Add 200 ml of extraction solution slowly to the carbon (it will effer- vesce). Cover and extract at room temperature on a mag- netic stirrer for 1 hour + 5 minutes. Filter through No. 41 filter paper. Determine trace metals in filtrate. Sample Analyses: The analyses are to be performed on the granular, acti- vated carbon filtrate in accordance with: Standard Methods for the Examination of Water and Waste- water, 15th Edition, American Public Health Association, Washington, D.C. (1981). Arsenic Chromium Lead Mercury Silver Section 304 Section 304 Section 304 Section 303F Section 304