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The determination of chromium(VI) in waste water and industrial effluents by differential pulse polarography
Affiliation:1. Department of Civil Engineering, New Mexico State University, Las Cruces, NM, USA;2. Department of Physics, New Mexico State University, Las Cruces, NM, USA;3. Department of Chemical and Materials Engineering, New Mexico State University, Las Cruces, NM, USA;1. Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM, 87185, USA;2. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;1. Department of Bioscience, Arctic Research Center, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark;2. Department of Bioscience, Zoophysiology, Aarhus University, C. F. Møllers Allé 3, Building 1131, DK-8000 Aarhus, Denmark;3. Hopkins Marine Station, Stanford University, 120 Ocean View Blvd, Pacific Grove, CA 93950, USA;4. Greenland Climate Research Centre at the Greenland Institute of Natural Resources, Kivioq 2, 3900 Nuuk, Greenland;5. Aarhus Institute for Advanced Studies, Aarhus University, Høegh-Guldbergs Gade 6B, 8000 Aarhus C, Denmark;1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;2. Key laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals, Changsha 410083, China
Abstract:
A method for the determination of chromium(VI) in water and waste water is described. Interfering cations are separated by co-precipitation with aluminium from the phosphate-buffered solution. Differential-pulse polarographic measurement of chromium(IV) in the same background solution at pH 10 or 12 provides a lower limit of determination of 30 μg l−1 Cr(VI). No significant losses of chromium(VI) occur in the precipitation step; chromium(VI) is not susceptible to reduction by waste-water constituents at the moderate pH maintained throughout the procedure. The polarographic characteristics of chromium(VI) in phosphate-buffered solution are discussed.
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