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Flotation-Concentration of Trace Phosphate Ion in Water Samples by <TEX>$La(OH)_3$</TEX> Coprecipitation
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1992, v.5 no.4, pp.425-431
Kim,
Y., Park,
S., &
Choi,
H.
(1992). Flotation-Concentration of Trace Phosphate Ion in Water Samples by <TEX>$La(OH)_3$</TEX> Coprecipitation. Analytical Science and Technology, 5(4), 425-431.
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Abstract
The concentration and determination of trace phosphate ion was studied by <TEX>$La(OH)_3$</TEX> 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.
- keywords
- trace phosphate ion, <TEX>$La(OH)_3$</TEX> coprecipitation, precipitate flotation, mixed surfactant
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