Colorimetric determination of phosphate ion using anion exchange resin of molybdate form

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  • モリブデン酸形陰イオン交換樹脂を用いるりん酸イオンの比色定量
  • モリブデンサンケイ インイオン コウカン ジュシ オ モチイル リンサン イオ
  • モリブデン酸形陰イオン交換樹脂を用いるリン酸イオンの比色定量

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Abstract

Orthophosphate in water is effectively condensed on anion exchange resin of molybdate form, and phosphomolybdate is formed on the resin. The resin is treated by reducing agent to develop a blue color. This color intensity is proportional to the concentration of the phosphate originally present in the water. The anion exchange resin of molybdate form is prepared by immersing Dowex 1 X8 {chloride form, (100200) mesh} in ammonium molybdate solution, and drying under reduced pressure. Procedure; Add 0.5 g of the resin into 25 ml of water sample (neutral or 0.2 M hydrochloric acid concentration), and stir for 20 min. Discard the supernatant solution and add 10 ml of reducing agent solution (ascorbic acid; 0.3%, antimonyl potassium tartrate; 0.01%, sulfuric acid; 0.25 M) to the resin, and stir for 10 min at 25°C. Discard the solution and wash the resin with water. Transfer the colored resin slurry into a 1 mm cell with water, and measure the absorbance at 705 nm against the resin as a reference. When 25 ml of the phosphate solution is treated by 0.5g of the resin, (0.11.0) ppm of phosphorus can be determined. When 1000 ml of the solution is treated, several ppb of phosphorus is detectable. Constant absorbance is obtained from the phosphate solution of pH 29 and (0.11)M hydrochloric acid concentration. 1000 ppm of chloride, nitrate, sulfate and acetate do not affect the determination of phosphate in neutral or acidic solution. Silicate produces blue color as like phosphate in neutral solution, but it produces only slight blue color in 0.2 M hydrochloric acid solution.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 28 (1), 43-47, 1979

    The Japan Society for Analytical Chemistry

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