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OCR for page 66
66
Name: SODIUM ZINC POLYPHOSPHATE, GLASSY
CAS No.: 65997-17-3
NAS/CWTC 036-82
Formula Weight: Unknown
Chemical Formula: (MPO3)n M2O Where M = Na and/or
1/2 Zn
n = 5
P2O5 = 55-61%
Description:
White to colorless glassy plates
Use:
Corrosion inhibitor.
Purity Requirements:
, granules or powder.
Analyses of available grades of glassy sodium zinc poly-
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 12.3 to 13.6 mg/liter, de-
pending on the P2O5 content of the specific product
used. If analyses are desired, the following protocol is
recommended.
Bulk Sample Collection:
Sample in accordance with Standard for Sodium Tri-
polyphosphate, AWWA B503-78, American Water Works
AS SOC iation, Denver, Colorado (1978).
OCR for page 67
67
Analytical Sample Preparation:
Weigh out 2.5 g of sodium zinc polyphosphate. 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
2. Gently heat the solution to reduce the volume below
loo ml, making certain that it does not boil. Quantita-
tively transfer to a 100-ml acid-washed volumetric flask
and make to volume with deionized distilled water. Pro-
cess a reagent blank by the same procedure.
Sample Analyses:
The analyses are to be performed on the sodium zinc poly-
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:
sodium zinc
