Journal
TALANTA
Volume 57, Issue 6, Pages 1029-1038Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-9140(02)00150-9
Keywords
coprecipitation; manganese dioxide; reductant; D-glucose; natural water; trace elements
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A field oriented and economical method of coprecipitation of trace elements like Al, Au, Bi, Cd, Co, Cu, Fe, Mo, Ni, Pb, Pd, Ti, V, W, Zn and REE has been developed. A novel reductant D-glucose, reduces KMnO4, in solution to form a precipitate of MnO2. Two liters of clear natural water sample is adjusted to pH 3.5-4.0, and is treated with 10 ml of 1% KMnO4 and 20 ml of 0.1% D-glucose. The sample is heated at a temperature of 75-80 degreesC, MnO2 is formed which coprecipitates the above trace elements. The precipitate is separated by filtration, dissolved in 2 ml of 50% HCl and 2 ml of 30% H2O2 and diluted to 25 ml for analysis using AAS and ICP-AES. The recoveries were found to be 96-105%. The preconcentration factor is 80. Limits of determination by the proposed method in natural waters are 1 mug l(-1) for Al, Cd, Mo, V, W, Ti and Zn, 5 mug l(-1) for Au, Bi, Co, Cu, Fe, Ni, Pb and Pd and 8 mug l(-1) for REE. The RSD of the present procedure (n = 5) is 8% at similar to 5 mug l(-1) level. Twenty water samples can be analyzed by an analyst in an 8-h day. (C) 2002 Elsevier Science B.V. All rights reserved.
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