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OCR for page 32
32
Name:
FERRIC SULFATE
CAS No.: 10028-22-5
Chemical Formula:
Description:
Fe2(SO4)3 ' nH2O
NAS/CWTC 013-82
Formula Weight: 399.8
Solid is red-gray to red-brown granules containing four
to five waters of hydration. Usually used in solutions
of 30-50% by weight ferric sulfate. Solutions are
reddish-brown.
Use:
Used in coagulation.
Purity Requirements:
The RMIC values are based on a maximum dosage of 100 mg
of ferric 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 100 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
Ferric Sulfate
50
10
50
50
2
10
50
OCR for page 33
33
Bulk Sample Collection:
Sample in accordance with Standard for Ferric Sulfate,
AWWA B406-64, American Water Works Association, Denver,
Colorado (1964).
Analytical Sample Preparation:
In preparing samples, use acid-washed glassware and make
all dilutions with deionized distilled water. Weigh 1 g
of ferric sulfate (dry weight basis), dissolve, and make
up to 1 liter in a volumetric flask. Transfer the solu-
tion to a 1.5-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 ferric 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
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
