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OCR for page 34
34
Name:
FERROUS SULFATE
CAS No.: 7720-78-7
Chemical Formula:
Description:
FeSO4 . 7H2O
NAS/CWTC 014-82
Formula Weight: 277.9
Pale, bluish-green crystals or granules. Ferrous salts
tend to oxidize in moist air and form brownish-colored
ferric salts. A 10% solution will have a pH of approxi-
mately 3.7. It is soluble in water and insoluble in
alcohol.
Use:
Used in coagulation.
Purity Requirements:
The RMIC values are based on a maximum dosage of 80 mg of
ferrous 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 80 mg/liter, the user is cautioned to
consult Table 2 for appropriate RMIC values.
RMIC mg Impurity/kg
Ferrous Sulfate
Impurity
Arsenic
Cadmium
Chromium
Lead
Mercury
Selenium
Silver
*Calculated on basis of FeSO4 · 7H2O.
60
10
60
60
3
10
60
OCR for page 35
35
Bulk Sample Collection:
Sample in accordance with Standard for Ferrous Sulfate,
AWWA B402-68, American Water Works Association, Denver,
Colorado (1968).
Analytical Sample Preparation:
In preparing samples, use acid-washed glassware and make
all dilutions with deionized distilled water. Weigh 0.8
g of ferrous sulfate (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 pH 6. Mix well, let
stand for 1 hour, and filter through a GF/C filter (or
equivalent) with vacuum. Quantitatively transfer fil-
trate into a beaker, adjust to pH 2 or less with concen-
trated 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 ferrous 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:
lead mercury
