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OCR for page 40
40
Name
—
SODIUM ALUMINATE
CAS No .: 1302-42-7
Chemical Formula: NaAlO2
Description
_:
NAS/CWTC 0017/82
Formula Weight: 82 0
.
A combination of sodium oxide and aluminum oxide with
sufficient excess causticity to stabilize. Solid form
usually contains 70-80% sodium aluminate; solutions,
approximately 30% sodium aluminate.
Used as coagulant
.
Purity Requirements
The RMIC values are based on a maximum dosage of 40 mg of
sodium aluminate/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
_ other than 40 mg/liter, the user is cautioned to
consult Table 2 for appropriate RMIC values.
Impurity
Arsenic
Cadmium
Chromium
Lead
Mercury
Selenium
Silver
RMIC mg Impurity/kg
Sodium Aluminate
100
30
100
100
5
30
100
OCR for page 41
l
41
Bulk Sample Collection:
1
Sample in accordance with Standard for Sodium Aluminate,
ANNA B405-60, American Water Works Association, Denver,
Colorado (1960).
Analytical Sample Preparation:
In preparing samples, use acid-washed glassware and make
all dilutions with deionized distilled water. Weigh 0.4
g of sodium aluminate (dry weight basis), dissolve, and
make up to 1 liter in a volumetric flask. Transfer the
solution to a 1.5-liter beaker, add 1 N of NaOH dropwise
with constant stirring to adjust to pa 6. Mix well, let
stand for 1 hour, and filter through a GF/C filter (or
equivalent) with vacuum. Quantitatively transfer filtrate
into a beaker, adjust to pH of 2 or less with concentrated
HNO3, and evaporate on a hot plate, without boiling, to
reduce the volume to less than 1 liter. Cool, quantita-
tively 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 sodium aluminate
solution 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
