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OCR for page 30
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Name: FERRIC CHLORIDE
CAS No.: 7705-08-0
Chemical Formula: FeC13
-
Description:
NAS/CWTC 012-82
Formula Weight: 162.3
Dark brown to yellow lumps or crystals. Solids are very
hydroscopic. Solutions are corrosive. Usually available
as a dark orange-brown liquid containing approximately
30% FeC13 by weight in water. May also be obtained as
dark crystals with the formula FeC13 · 6H2O.
Use:
Used in coagulation.
Purity Requirements:
The RMIC values are based on a maximum dosage of 60 mg of
ferric chloride/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 60 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 Chloride
80
20
80
80
20
80
OCR for page 31
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Bulk Sample Collection:
Sample in accordance with Standard for Alum, AWWA B403-82,
American Water Works Association, Denver, Colorado (1982).
Analytical Sample Preparation:
In preparing samples, use acid-washed glassware and make
all dilutions with deionized distilled water. Weigh 0.6
g of ferric chloride (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 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 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, 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 ferric chloride
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
