National Academies Press: OpenBook

Water Chemicals Codex (1982)

Chapter: Sodium Metabisulfite, Sodium Pyrosulfate

« Previous: Sodium Hydroxide, Caustic Soda
Suggested Citation:"Sodium Metabisulfite, Sodium Pyrosulfate." Institute of Medicine and National Research Council. 1982. Water Chemicals Codex. Washington, DC: The National Academies Press. doi: 10.17226/159.
×
Page 49
Suggested Citation:"Sodium Metabisulfite, Sodium Pyrosulfate." Institute of Medicine and National Research Council. 1982. Water Chemicals Codex. Washington, DC: The National Academies Press. doi: 10.17226/159.
×
Page 50

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

49 NAS/CWTC 0 23 -8 2 Name: SODIUM METABISULFITE, SODIUM PYROSULFATE CAS No 7631-90-5 · — Chemical Formula: Na2S2O5 Description: Formula Weight: 174.1 White to slight yellow crystals with a sulfurous odor. When in solution, sodium metabisulfite is formed. It has a Volubility in water of 54 g/100 ml at 20°C and is avail- able at a commercial strength of 97.5-99.0% sodium meta- bisulfite. Use: Used to remove chlorine and other oxidants Purity Requirements: . The RMIC values are based on a maximum dosage of 15 mg of sodium metabisulfite/liter of water and are to be com- pared to impurity concentrations obtained by using sample procedures described in this monograph. If the actual dosage is other than 15 mg/liter, the user is cautioned to consult Table 2 for appropriate RMIC values. Impurity Arsenic Selenium Bulk Sample Collection: RMIC mg Impurity/kg Sodium Metabisulfite 300 70 Sample in accordance with Standard for Sodium Meta- bisulfite, AWWA B601-77, American Water Works Association, Denver, Colorado (1977).

50 Analytical Sample Preparation: Weigh out 2.5 g of sodium metabisulfite. 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 HNO3 to a pH of less than 2. Gently heat the solution to reduce the volume below 100 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. Process a reagent blank by the same procedure. Sample Analyses: The analyses are to be performed on the sodium meta- bisulfite sample in accordance with: Standard Methods for the Examination of Water and Waste- water, 15th Edition, American Public Health Association, Washington, D.C. (1981). Arsenic Section 304 Selenium Section 304

Next: Sodium Polyphosphate, Glassy »
Water Chemicals Codex Get This Book
×
Buy Paperback | $45.00
MyNAP members save 10% online.
Login or Register to save!
Download Free PDF
  1. ×

    Welcome to OpenBook!

    You're looking at OpenBook, NAP.edu's online reading room since 1999. Based on feedback from you, our users, we've made some improvements that make it easier than ever to read thousands of publications on our website.

    Do you want to take a quick tour of the OpenBook's features?

    No Thanks Take a Tour »
  2. ×

    Show this book's table of contents, where you can jump to any chapter by name.

    « Back Next »
  3. ×

    ...or use these buttons to go back to the previous chapter or skip to the next one.

    « Back Next »
  4. ×

    Jump up to the previous page or down to the next one. Also, you can type in a page number and press Enter to go directly to that page in the book.

    « Back Next »
  5. ×

    To search the entire text of this book, type in your search term here and press Enter.

    « Back Next »
  6. ×

    Share a link to this book page on your preferred social network or via email.

    « Back Next »
  7. ×

    View our suggested citation for this chapter.

    « Back Next »
  8. ×

    Ready to take your reading offline? Click here to buy this book in print or download it as a free PDF, if available.

    « Back Next »
Stay Connected!