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OCR for page 70
70
Name: SULFURIC ACID (OIL OF VITRIOL)
CAS No: 7664-93-9
Chemical Formula: H2SO4
Description:
Hygroscopic, syrupy corrosive liquid.
Use:
NAS/CWTC 038/82
Formula Weight: 98.0
Used in pa adjustment following lime softening. Prepara-
tion of activated silica from sodium silicate. Regenera-
tion of resins.
Purity Requirements
.
Analyses of available grades of sulfuric acid show the
presence of selenium, arsenic, and lead. For arsenic and
lead the levels are far below that which would necessitate
RMIC values based on a maximum dosage of 50 mg/liter. If
the actual dosage is other than 50 mg/liter, the user is
cautioned to consult Table 2 for appropriate RMIC values.
Impurity
Selenium
Analytical Sample Preparation:
RMIC mg/Impurity/kg
Sulfuric Acid
20
To an acid-washed 500-ml volumetric flask, add approxi-
mately 250 ml of deionized water. Slowly, and with
agitation, add 5 ml of sample to the water in the flask.
Caution: Eye protection must be worn during this pro-
cedure' Excessive heat buildup may result if sample is
added to water too rapidly.
OCR for page 71
71
Sample Analyses:
Analyze the sulfuric acid solution in accordance with
Standards Methods for the Examination of Water and Waste-
water, 15th Edition, American Public Health Association,
Washington, D.C. (1980).
Chromium
Lead
Selenium
Section 304
Section 304
Section 304
Representative terms from entire chapter:
acid solution
