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OCR for page 9
NAS/CWTC 001-82
Name: ALUMINUM SULFATE, ALUM
CAS No.: 10043-01-3
Chemical Formula:
Description:
A12(SO4)3 14 H2O
Formula Weight: 546.1
A white solid in the form of powder, crystals, or plate-
lettes, or as a liquid. The most common degree of hydra-
tion is A12(SO4)3 14 H2O. m e commerical standard for
water soluble alum is not less than 17.0% A12O3 for solid
and not less than 8.0% A12O3 for liquid alum.
Use:
Used as a coagulant and precipitant for phosphate.
Purity Requirements:
The RMIC values are based on a maximum dosage of 150 mg
aluminum sulfate*/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 150 mg/liter, the user is cautioned
to consult Table 2 for appropriate RMIC values.
RMIC mg Impurity/kg
Impurity Aluminum Sulfate*
Arsenic
Cadmium
Chromium
Lead
Mercury
Selenium
Silver
30
7
30
30
1
7
30
*Calculated on the basis of AL2(SO4)3 14 H2O
9
OCR for page 10
10
Bulk Sample Collection:
Sample in accordance with Standard for Aluminum Sulfate,
AWWA B403-82, American Water Works Association, Denver,
Colorado (1982).
Analytical Sample Preparation:
In preparing samples, use acid-washed glassware and make
all dilutions with deionized distilled water. Weigh 1.5
g of aluminum sulfate (dry weight basis), dissolve, and
make up to 1 liter in a volumetric flask. Transfer the
solution to a 15-liter beaker; add 1 N NaOH dropwise with
constant stirring to adjust to pH 6. Mix well, let stand
for 1 hour, and filter through a GF/C filter (or equiva-
lent) with vacuum. Quantitatively transfer filtrate into
a beaker, adjust to pH 2 or less with concentrated HNO3,
and evaporate on a hot plate, without boiling, to reduce
the volume to less than 1 liter. Cool, quantitatively
transfer to a 1-liter volumetric flask, and make up to
volume. Similarly, treat a reagent blank.
Sample Analyses:
The analyses are to be performed on the aluminum sulfate
sample in accordance with:
Standard Methods for the Examination of Water and Waste
water, 15th Edition, American Public Health Association
Washington, D.C. (1981).
Arsenic
Cadmium
Chromium
Lead
Mercury
Selenium
Silver
Section 304
Section 304
Section 304
Section 304
Section 303F
Section 304
Section 304
Representative terms from entire chapter:
mercury selenium
