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OCR for page 64
64
Name: SODIUM TRIPOLYPHOSPHATE
CAS No.: 7758-29-4
Chemical Formula: Na5P3°lo
Formula Weight: 368
I Description
.
White, odorless granules or powder.
Use:
NAS/CWTC 035/82
Na5P3O1o 6HgO
476
Used as corrosion inhibitor, sequestrant, and water
softener.
Purity Requirements:
The analyses are to be performed on the sodium tripoly-
phosphate show the presence of cadmium and lead but at
levels far below that which would necessitate RMIC values
based on a maximum dosage of 12.9 mg/liter. If analyses
are desired, the following protocol is recomended.
Bulk Sample Collection:
Sample in accordance with Standard for Sodium Tripoly-
phosphate, AWWA B503-78, American Water Works Associa-
tion, Denver, Colorado (1978).
Analytical Sample Preparation:
Weigh out 2.5 g of sodium tripolyphosphate. In a 150-ml
acid-washed beaker, dissolve the sample in 100 ml of
deionized distilled water. Under a hood, acidify the
solution with concentrated HNC3 to a pH of less than
OCR for page 65
65
2. Gently heat the solution to reduce the volume below
100 ml, making certain that it does not boil. Quan~ita-
tively 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.
Sample Analyses:
The analyses are to be performed on the sodium tripoly-
phosphate solution in accordance with:
Standard Methods for the Examination of Water and Waste-
water, 15th Edition, American Public Health Association,
Washington, D.C. (1981).
Cadmium
Lead
Section 304
Section 304
Representative terms from entire chapter:
distilled water
