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OCR for page 44
44
Name: SODIUM CHLORITE
CAS No.: 7 758 -19-2
Chemical Formula: NaClO2
Description:
NAS/CWTC 019-82
Formula Weight: 90.5
Tan or white crystals or powder that are hydroscopic.
This powerful oxidizing agent is explosive on contact
with organic matter. It has a solubility in water of 39
g/100 ml at 17°C and is available at a commercial
strength of 81.0-98.5% sodium chlorite.
Use:
Used for on-site production of chlorine dioxide.
AL irements:
The RMIC values are based on a maximum dosage of 10 mg of
sodium chlorite/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
Mercury
Selenium
Bulk Sample Collection:
RMIC mg Impurity/kg
Sodium Chlorite
20
100
Sample in accordance with Standard for Sodium Chlorite,
AWWA B303-67, American Water Works Association, Denver,
Colorado (1967).
OCR for page 45
45
Analytical Sample Preparation:
Pour 100 ml of sodium chlorite into a 150-ml acid-washed
beaker. Under a hood, acidify the sample with concen-
trated HNO3 to a pH of less than 2. Gently heat the solu-
tion 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. For the mercury analysis, use a separate
100-ml aliquot of sodium chlorite. Repeat the same prep-
aration.
Sample Analyses:
The analyses are to be performed on the sodium chlorite
solution in accordance with:
Standard Methods for the Examination of Water and Waste-
water, 15th Edition, American Public Health Association,
Washington, D.C. (1981).
Selenium
Mercury
Section 304
Section 303F
All products used for disinfection that contain this
compound must be registered as prescribed by Federal
Insecticide, Fungicide and Rodenticide Act.
Representative terms from entire chapter:
mercury analysis
