National Academies Press: OpenBook

Water Chemicals Codex (1982)

Chapter: Ferric Sulfate

« Previous: Ferric Chloride
Suggested Citation:"Ferric Sulfate." Institute of Medicine and National Research Council. 1982. Water Chemicals Codex. Washington, DC: The National Academies Press. doi: 10.17226/159.
×
Page 32
Suggested Citation:"Ferric Sulfate." Institute of Medicine and National Research Council. 1982. Water Chemicals Codex. Washington, DC: The National Academies Press. doi: 10.17226/159.
×
Page 33

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.

32 Name: FERRIC SULFATE CAS No.: 10028-22-5 Chemical Formula: Description: Fe2(SO4)3 ' nH2O NAS/CWTC 013-82 Formula Weight: 399.8 Solid is red-gray to red-brown granules containing four to five waters of hydration. Usually used in solutions of 30-50% by weight ferric sulfate. Solutions are reddish-brown. Use: Used in coagulation. Purity Requirements: The RMIC values are based on a maximum dosage of 100 mg of ferric sulfate/liter of water and are to be compared to impurity concentrations obtained by using sample procedures described in this monograph. If the actual dosage is other than 100 mg/liter, the user is cautioned to consult Table 2 for appropriate RMIC values. Impurity Arsenic Cadmium Chromium Lead Mercury Selenium Silver RMIC mg Impurity/kg Ferric Sulfate 50 10 50 50 2 10 50

33 Bulk Sample Collection: Sample in accordance with Standard for Ferric Sulfate, AWWA B406-64, American Water Works Association, Denver, Colorado (1964). Analytical Sample Preparation: In preparing samples, use acid-washed glassware and make all dilutions with deionized distilled water. Weigh 1 g of ferric sulfate (dry weight basis), dissolve, and make up to 1 liter in a volumetric flask. Transfer the solu- tion to a 1.5-liter beaker, add 1 N NaOH dropwise with constant stirring to adjust to pH 6. Mix well, let stand for 1 hour, and filter through a GF/C filter (or equiva- lent) with vacuum. Quantitatively transfer filtrate into a beaker, adjust to pH 2 or less with concentrated HNO3, and evaporate on a hot plate, without boiling, to reduce the volume to less than 1 liter. Cool, quantitatively transfer to a 1-liter volumetric flask, and make up to volume. Similarly treat a reagent blank. Sample Analyses: The analyses are to be performed on the ferric sulfate solution in accordance with: Standard Methods for the Examination of Water and Waste- water, 15th edition, American Public Health Association, Washington, D.C. (1981). Arsenic Cadmium Chromium Lead Mercury Selenium Silver Section 304 Section 304 Section 304 Section 304 Section 303F Section 304 Section 304

Next: Ferrous Sulfate »
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!