Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.
Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.
OCR for page 40
40 Name — SODIUM ALUMINATE CAS No .: 1302-42-7 Chemical Formula: NaAlO2 Description _: NAS/CWTC 0017/82 Formula Weight: 82 0 . A combination of sodium oxide and aluminum oxide with sufficient excess causticity to stabilize. Solid form usually contains 70-80% sodium aluminate; solutions, approximately 30% sodium aluminate. Used as coagulant . Purity Requirements The RMIC values are based on a maximum dosage of 40 mg of sodium aluminate/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 _ other than 40 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 Sodium Aluminate 100 30 100 100 5 30 100
OCR for page 41
l 41 Bulk Sample Collection: 1 Sample in accordance with Standard for Sodium Aluminate, ANNA B405-60, American Water Works Association, Denver, Colorado (1960). Analytical Sample Preparation: In preparing samples, use acid-washed glassware and make all dilutions with deionized distilled water. Weigh 0.4 g of sodium aluminate (dry weight basis), dissolve, and make up to 1 liter in a volumetric flask. Transfer the solution to a 1.5-liter beaker, add 1 N of NaOH dropwise with constant stirring to adjust to pa 6. Mix well, let stand for 1 hour, and filter through a GF/C filter (or equivalent) with vacuum. Quantitatively transfer filtrate into a beaker, adjust to pH of 2 or less with concentrated HNO3, and evaporate on a hot plate, without boiling, to reduce the volume to less than 1 liter. Cool, quantita- tively 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 sodium aluminate 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
Representative terms from entire chapter: