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OCR for page 13
13
Name: AMMONIUM SULFATE
CAS No.: 7783-20-2
Chemical Formula: (NH4) 2SO4
Description
.
NAS/CWTC 004-82
Formula Weight: 132.0
A reddish-white to brown crystalline solid that has a
tendency to cake. It is available at a commercial
strength of 99% ammonium sulfate.
Use
—
Used with chlorine during disinfection for control of
trihalomethanes, tastes, and odors.
Purity Requirements:
The RMIC values are based on a maximum dosage of 25 mg of
ammonium sulfate/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 25 mg/liter, the user is cautioned to con-
sult Table 2 for appropriate RMIC values.
Impurity
Arsenic
Pyridine
Selenium
Lead
Ether extract-
able matter
RMIC mg Impurity/kg
Ammonium Sulfate
200
50
40
200
-
30
OCR for page 14
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Bulk Sample Collection:
Sample in accordance with Standard for Ammonium Sulfate,
AWWA B302-81, American Water Works Association, Denver,
Colorado (1981).
Analytical Sample Preparation
.
Weigh out 2.5 g of ammonium sulfate. In an acid-washed
beaker, dissolve the sample with 100 ml of deionized
distilled water. Under a hood, acidify the solution with
concentrated HNO3 to a pH of less than 2. Gently heat
the solution to reduce the volume below 100 ml, making
certain that it does not boil. Quantitatively 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--Inorganic:
The analyses are to be performed on the ammonium sulfate
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
Lead
Selenium
Sample Analyses--Organic:
Section 304
Section 304
Section 304
The analyses are to be performed on the ammonium sulfate
solution in accordance with:
Standard for Ammonium Sulfate, AWWA B302-81, American
Water Works Association, Denver, Colorado (1981).
Representative terms from entire chapter:
sulfate solution
