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OCR for page 25
25
Name: CARBON, ACTIVATED, POWDERED
CAS No.: 7440-44-0
Chemical Formula: C
Description:
Formu] _
Black powder with enormous surface area; insoluble in
water.
Use:
NAS/CWTC 009-82
12.0
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.
ImPur i by
Arsenic
Chromium
Lead
Mercury
Silver
Bulk Sample Collection:
RMIC mg Impurity/kg
Activated Carbon
30
30
30
30
Sample in accordance with Standard for Powdered Activated
Carbon, AWWA B600-78, American Water Works Association,
Denver, Colorado (1978).
OCR for page 26
26
Analytical 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 PAC into a 400-ml beaker. Add 200 ml of
extraction solution slowly to the carbon. Add 1 drop of
nonionic detergent (wetting agent). Cover with watch-
glass and begin extraction on magnetic stirrer, agitating
slowly at first until all PAC is wetted and in suspension
Continue extraction for a total contact time of 1 hour +
5 minutes. Filter through No. 41 filter paper. Use
filtrate for analysis.
Sample Analyses:
The analyses are to be performed on the powdered,
activated 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
Representative terms from entire chapter:
mercury silver
