イオン交換樹脂濃縮/紫外吸収検出法による環境水中の微量鉄(III)の定量(<特集>超微量分析のための前処理と予備濃縮)

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タイトル別名
  • Determination of trace amounts of iron(III) in environmental waters by ion exchange preconcentration and UV detection.
  • イオン交換樹脂濃縮／紫外吸収検出法による環境水中の微量鉄（ＩＩＩ）の定量
  • イオン コウカン ジュシ ノウシュク シガイ キュウシュウ ケンシュツホウ ニ

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抄録

Trace amount of ferric ion (up to 0.5μg) in waters was preconcentrated on a cation-exchange column (Dionex cation seperator column for ion chromatography, 3 mmφ × 200 mm), eluted with 5 × 10-3 M EDTA solution (pH 3.2, flow rate: 1.0 ml/min), and determined by measuring the UV absorbance of the Fe(III)-EDTA complex in the eluent at 260 nm. The column and the eluent were warmed at 40 °C. Linear calibration curves were obtained for 0100 ppb and 020 ppb of ferric ion using 5 ml and 25 ml sample solutions (0.05 M sulfuric acid solution), respectively. Relative standard deviations obatained in each 10 measurements for 5 ml (50 ppb) and 25 ml (10 ppb) of the ferric ion solutions were 3.2 and 3.0%, respectively. The present method was applied to the determination of dissolved iron, contained ionic iron and complexed iron, in lake and river waters. Ferrous ion in water was oxidized to ferric ion by addition of hydrogen peroxide (0.005%). Complexed iron was decomposed to ferric iron by heating the sample water with potassium peroxodisulfate.

収録刊行物

  • 分析化学

    分析化学 36 (11), 647-651, 1987

    公益社団法人 日本分析化学会

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