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AWWA B505-24 Disodium Phosphate, Anhydrous, 2024
- Foreword [Go to Page]
- I. Introduction. [Go to Page]
- I.A. Background. Disodium phosphate, anhydrous, is a manufactured product obtained by combining a comparatively pure chemical—soda ash (Na2CO3) or caustic soda (NaOH)—with phosphoric acid (H3PO4). The resulting product is dried, sized, and packaged. [Go to Page]
- I.B. History. In 1985, the AWWA Standards Committee on Scale and Corrosion-Control Chemicals recognized the need for a standard for disodium phosphate, anhydrous, which is used as a corrosion-control product in the treatment of potable water. The AWWA Sta [Go to Page]
- I.C. Acceptance. In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF) to develop voluntary third-party consensus standards and a certification program for direct
- II. Special Issues. [Go to Page]
- II.A. Storage and Handling Precautions. Disodium phosphate, anhydrous, is relatively hygroscopic and will absorb water. It must be stored under dry conditions. Exposure to humidity produces a caked condition. This results in poor flow and caking that inte
- III.B. Modification to Standard. Any modification of the provisions, definitions, or terminology in this standard must be provided by the purchaser.
- IV. Major Revisions. Major changes made to the standard in this revision include the following:
- AWWA Standard
- SECTION 1: GENERAL
- Sec. 1.1 Scope
- Sec. 1.2 Purpose
- Sec. 1.3 Application
- SECTION 2: REFERENCES
- SECTION 3: DEFINITIONS
- SECTION 4: REQUIREMENTS
- Sec. 4.1 Physical Requirements
- Sec. 4.2 Chemical Requirements
- Sec. 4.3 Impurities*
- SECTION 5: VERIFICATION
- Sec. 5.2 Test Procedures
- SECTION 6: DELIVERY [Go to Page]
