Simultaneous Flotation and Determination of Trace Cobalt, Copper and Total Chromium in Sea water by $La(OH)_3$ Coprecipitation

$La(OH)_3$ 공침에 의한 해수중 흔적량 코발트, 구리, 및 전체 크롬의 동시 부선 및 정량

  • 조만식 (고려대학교 이과대학 화학과) ;
  • 임흥빈 (단국대학교 이과대학 화학과) ;
  • 김영상 (고려대학교 이과대학 화학과)
  • Published : 19940900


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 $NaBH_4$ 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 $HNO_3$ 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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