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Name: SULFUR DIOXIDE
CAS No.: 7446-09-5
Chemical Formula SO2
—
Description:
NAS/CWTC 026-82
Formula Weight: 64.0
A colorless gas that liquifies under pressure to form a
colorless liquid. As a gas it is corrosive and has a
suffocating, pungent odor. When in solution, H2SO3
is formed. It has a solubility in water of 11.3 g/100 ml
at 20°C and is available at a commercial strength of 100%
sulfur dioxide.
Use:
Used to remove chlorine and other oxidants from water.
Purity Requirements:
The RMIC values are based on a maximum dosage of 10 mg of
sulfur dioxide/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 10 mg/liter, the user is cautioned to
consult Table 2 for appropriate RMIC values.
Impurity
Arsenic
Selenium
Bulk Sample Collection:
RMIC mg Impurity/kg
Sulfur Dioxide
500
100
A 300-ml sample of sulfur dioxide injection water should
be collected at the point of application. A 300-ml
sample of the injection water prior to sulfur dioxide
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addition should also be collected and used for a sample
blank. The latter sample should be preserved with 1 ml
of concentrated HNO3.
Analytical Sample Preparation:
Pour 100 ml of sulfur dioxide injection water sample into
a 150-ml acid-washed beaker. Determine if the sample has
a pH of less than 2. If it does not, acidify the sample
with concentrated HNO3 to a pH of less than 2. Transfer
to a 100-ml acid-washed volumetric flask. Repeat this
preparation procedure with 100 ml of the sample blank.
For the mercury analysis, use a separate 100-ml aliquot
of sulfur dioxide injection water and sample blank.
Repeat the same preparation.
Sample Analyses:
The analyses are to be performed on the sulfur dioxide
sample in accordance with:
Standard Methods for the Examination of Water and Waste-
water, 15th Edition, American Public Health Association,
Washington, D.C. (1981).
Arsenic
Selenium
Section 304
Section 304
Representative terms from entire chapter:
injection water
