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KMID : 1059519940380090667
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Journal of the Korean Chemical Society
1994 Volume.38 No. 9 p.667 ~ p.675
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Simultaneous Flotation and Determination of Trace Cobalt, Copper and Total Chromium in Sea water by La(OH)3 Coprecipitation
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Cho Man-Sik
Lim Heung-Bin
Kim Young-Sang
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Abstract
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The precipitate flotation using La(OH)3 as a coprecipitant was studied for the simultaneous determination of trace three elements in a sea water. Several experimental conditions such as pH, coprecipitant and surfactant were investigated with an artificial sea water. To remove the influence of Cr(Ⅵ) the Cr(Ⅵ) was reduced to Cr(Ⅲ) using NaBH4 prior to the flotation. Trace amounts of Cu(Ⅱ), Co(Ⅱ) and total Cr in 1.0 l sea water was coprecipitated together with the precipitation of La(OH)3 in the solution of pH 9.8 adjusted with 3.OM NaOH solution. The precipitate was floated by using a mixed surfactant (1 to 8 of each 0.5% ethanolic sodium oleate and sodium dodecylsulfate solution) by bubbling a nitrogen gas. The floats was separated and filtrated from the mother liquor by suction. The precipitate was dissolved in 7.0 M HNO3 solution and then marked to 25.0 ml with a deionized water. These elements were determined by graphite fumace atomic absorption spectrophotometry. This method was applied to determine the elements in the sea water of the Eastern and Western coasts. And the recoveries were over 90.0% in the samples into which given amounts of the analyte elements were spiked.
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