Flotation-Concentration of Trace Phosphate Ion in Water Samples by $La(OH)_3$ Coprecipitation

$La(OH)_3$ 공침에 의한 물시료 중 흔적량 인산이온의 부선 농축

  • 김영상 (고려대학교 자연과학대학 화학과) ;
  • 박상완 (애경산업주식회사 중앙연구소) ;
  • 최희선 (수원대학교 이과대학 화학과)
  • Published : 1992.12.25


The concentration and determination of trace phosphate ion was studied by $La(OH)_3$ coprecipitaiton. Phosphate ions in 1.0L samples were coprecipitated with lanthanium hydroxide at pH 9.5 adjusted with ammonia solution. The precipitates were floated with the aid of mixed surfactant(1:8 sodium oleate/sodium dodecyl sulfate) and nitrogen gas bubbles. The floated precipitate was collected in suction flask from the solution. The precipitate were washed with dil. ammonia solution and dissolved in sulfuric acid. The phosphate ion in the concentrated solution was finally determinated by UV/VIS spectrophotometry using the molybdenium blue method. The proposed method could be applied to the determination of phosphate ion in tap water and river water.