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OCR for page 42
42
Name: SODIUM CARBONATE, SODA ASH
CAS No.: 497 - 19 - 8
Chemical Formula: Na2CO3
Description:
NAS/CWTC 018 - 82
Formula Weight: 105. 0
Sodium carbonate, anhydrous is a white granular material
The alkali equivalent of 100% sodium carbonate is 58.48%
sodium oxide.
Use:
Used for pH adjustment.
Purity Requirements:
..
The RMIC values are based on a maximum dosage of 100 me
of sodium carbonate/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 100 mg/liter, the user is cautioned to con-
sult Table 2 for appropriate RMIC values.
Impurity
Chromium
Lead
Bulk Sample Collection:
RMIC mg ImpuritY/kg
Sodium Carbonate
-
50
50
Sample in accordance with Standard for Soda Ash, AWWA
B201-80, American Water Works Association, Denver,
Colorado (1980).
OCR for page 43
43
Analytical Sample Preparation:
Weigh out 2.5 g of sodium carbonate. In a 150-ml acid-
washed beaker, dissolve the sample with 100 ml of
deionized distilled water. Under a hood, acidify the
solution with concentrated HC1 to a pH of less than 2.
Add hydroxylamine hydrochloride until the solution turns
clear. Gently heat the solution to reduce the volume
below 100 ml, making certain that it does not boil. Quan-
titively 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.
Sample Analyses
_:
The analyses are to be performed on the sodium carbonate
solution in accordance with:
Standard Methods for the Examination of Water and Waste-
water, 15th Edition, American Public Health Association,
Washington, D.C. (1981).
Chromium
Lead
Section 304
Section 304
Representative terms from entire chapter:
distilled water
