||Critical evaluation of differential pulse polarography for determining chromium (III) and chromium (VI) in water samples /
Howe, Lyman H. ;
Jones, Isaac E. ;
Stanley, Norman K.
||United States. National Bureau of Standards. Office of Standard Reference Data.
|| U.S. Environmental Protection Agency ; Available through the National Technical Information Service,
Polarograph and polarography
Water analysis ;
Chemical analysis ;
Industrial wastes ;
Combustion products ;
Performance evaluation ;
Electric power plants ;
Water pollution ;
Laboratory equipment ;
Water pollution detection ;
Coal fired power plants ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||30 pages : illustrations ; 28 cm.
The Tennessee Valley Authority critically evaluated differential pulse polarography for determining chromium(VI) and chromium(III) in water samples from coal-fired steam-electric generating stations. After addition of reagents to overcome interference, the peak currents for chromium(III) and chromium(VI) are measured separately in different electrolytes and quantified by standard addition. Total chromium is the algebraic sum of chromium(VI) and chromium(III). The effective range for quantification is 0.1 to 10 mg/l of chromium(VI) and 0.6 to 10 mg/l of chromium(III). Interferences by lead(II) and chromium(VI) on chromium(III) are discussed. Lead(II) does not interfere with measurement of chromium(VI), and chromium(III) does not interfere with chromium(VI). Copper(II), zinc(II), and iron(III) do not interfere with measurement of either chromium(III) or chromium(VI).
Prepared for Office of Energy, Minerals, and Industry, Office of Research and Development, U.S. Environmental Protection Agency. Includes bibliographical references (pages 27-29). Microfiche.