Organic Precipitate Flotation of Trace Metallic Elements with Ammonium Pyrrolidinedithiocarbamate(Ⅰ). Determination of Bismuth, Cadmium, Cobalt and Lead in Water Samples by Coprecipitation-Flotation with Cu-pyrrolidinedithiocarbamate

Ammonium Pyrrolidinedithiocarbamate에 의한 극미량 금속원소의 유기침전 부선에 관한 연구(제1보) Cu-pyrrolidinedithiocarbamate 공침부선에 의한 물시료중 비스무트, 카드뮴, 코발트 및 납의 정량

  • 정용준 (고려대학교 자연과학대 화학과) ;
  • 최종문 (고려대학교 자연과학대 화학과) ;
  • 최희선 (수원대학교 화학과) ;
  • 김영상 (고려대학교 자연과학대 화학과)
  • Published : 19961200


The organic precipitate flotation using Cu(II)-pyrrolidinedithiocarbamate complex as a coprecipitant was studied for the preconcentration and determination of trace Cd, Pb, Bi and Co in several water samples. Experimental conditions such as pH of solution, amounts of Cu(II) and ammonium pyrrolidinedithiocarbamate(APDC), stirring time, the type and amount of surfactant, etc. were optimized for the effective flotation of analytes. After 3.0 mL of 1,000 ${\mu}g/mL$ Cu(II) solution was added to 1.00 L water sample, the pH of the solution was adjusted to 2.5 with HNO3 solution. Trace amounts of analytes were coprecipitated by adding 2.0% APDC solution. And the precipitates were flotated onto the surface of solution with the aid of nitrogen gas and sodium lauryl sulfate. The floats were collected from mother liquor, and filtered through the micropore glass filter by suction. The precipitates were dissolved with 4 mL conc. HNO3, and then diluted to 25.00 mL with deionized water. The analytes were determined by graphite furnace atomic absorption spectrophotometry. This flotation technique was applied to the analysis of some water samples, and the 90 to 120% of recoveries were obtained from the spiked samples, this procedure could be concluded to be simple and applicable for the trace element analysis in various kinds of water.



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