AWWA B503-17 pdf download.Sodium Tripolyphosphate
4.3.1 General. The material supplied in accordance with this standard shall contain no soluble inorganic or organic substances in quantities capable of producing deleterious or injurious effects on the health of those consuming water that has been properly treated with the material.
4.3.2 Water-insoluble matter. Water-insoluble matter in the sodium tri- polyphosphate shall not exceed 0.2 percent by weight.
4.3.3 Product certifications. The material is a direct additive used in the treatment of potable water. This material should be certified as suitable for contact with or treatment of drinking water by an accredited certification organization in accordance with NSF/ANSI 60. Evaluation shall be accomplished in accordance with requirements that are no less restrictive than those listed in NSF/ANSI 60. Certification shall be accomplished by a certification organization accredited by the American National Standards Institute.
5.2.1 Laboratory examination. Samples to be analyzed for phosphorus content have a maximum holding time of 28 days. Therefore, the laboratory exam- ination of the samples should be completed as soon as possible after receipt of the shipment (Sec. 5.1).
5.2.2 Test procedure for size. For powder and granular materials, weigh 100 g of sample and screen on the appropriate US Standard Sieve Series, then weigh the amounts of material passing through or retained on the sieves.
5.2.3 Test procedure for solubility. Weigh 10 g of sample and add slowly, while sirring, to 100 mL of ditilleld water at 50*-100°F (10- 38°C). Stir moderately for 30 min, after which time all material should, by visual determination, be dis- solved. Filter through tared, dried glass fiber filter of the type used in total suspended solids. Wash the beaker with distilled water. Using the same distilled water, wash the residue with six 25-mL portions of distilled water. Dry the filter and residue at 221°F (105°C) for 1 hr and weigh. Report the increase in weight (as a percentage of the original sample weight) as insoluble matter (for example, 0.02 g equals 0.2 percent).
5.2.4 Test procedure for P2Os content. Phosphorous pentoxide (P2Os) content shall be determined by the pH titration method described in the following paragraphs. As an alternative, the procedures presented in Sec. 5.2.5 may be used. If discrepancies between the methods develop, the tration method in Sec. 5.2.4 shall govern.AWWA B503-17 pdf download.