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OCR for page 13
13 Name: AMMONIUM SULFATE CAS No.: 7783-20-2 Chemical Formula: (NH4) 2SO4 Description . NAS/CWTC 004-82 Formula Weight: 132.0 A reddish-white to brown crystalline solid that has a tendency to cake. It is available at a commercial strength of 99% ammonium sulfate. Use — Used with chlorine during disinfection for control of trihalomethanes, tastes, and odors. Purity Requirements: The RMIC values are based on a maximum dosage of 25 mg of ammonium sulfate/liter of water and are to be compared to impurity concentrations obtained by using sample proce- dures described in this monograph. If the actual dosage is other than 25 mg/liter, the user is cautioned to con- sult Table 2 for appropriate RMIC values. Impurity Arsenic Pyridine Selenium Lead Ether extract- able matter RMIC mg Impurity/kg Ammonium Sulfate 200 50 40 200 - 30
OCR for page 14
14 Bulk Sample Collection: Sample in accordance with Standard for Ammonium Sulfate, AWWA B302-81, American Water Works Association, Denver, Colorado (1981). Analytical Sample Preparation . Weigh out 2.5 g of ammonium sulfate. In an acid-washed beaker, dissolve the sample with 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. Quantitatively 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--Inorganic: The analyses are to be performed on the ammonium 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 Lead Selenium Sample Analyses--Organic: Section 304 Section 304 Section 304 The analyses are to be performed on the ammonium sulfate solution in accordance with: Standard for Ammonium Sulfate, AWWA B302-81, American Water Works Association, Denver, Colorado (1981).
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