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A rapid and simple spectrophotometric determination method for chemical oxygen demand in water samples was developed using a flow-injection method. The detection method is based on the permanganate oxidation reaction accelerated by a catalyst. A platinum tube reactor was installed after the merging point of a carrier and a reagent stream as a catalyst and a reactor coil, and was heated at 95°C by an aluminum heating block. By using the platinum tube reactor (0.5 mm i.d.×3 m), a standard sample, D-glucose, was measured within a few minutes, and the calibration graph was linear from 0 to 100 ppm of COD(D-glucose); the detection limit corresponding to S/N = 3 was 0.01 ppm. The relative standard deviations for 5, 10, 50 and 100 ppm of COD(D-glucose) were 0.9, 0.8, 0.8, 0.5 and 1.4%, respectively. The proposed FIA system can be applied to waste water or can be used as a monitor of COD.化学的酸素要求量CODの迅速定量についてフローインジェクション/吸光光度定量の検討を行った過マンガン酸カリウムを酸化剤として用いこの酸化反応の反応時間を促進させ短縮するため触媒を用いる方法について検討したその結果白金チューブを反応コイルとして用いることにより酸化反応が促進され測定時間を大幅に短縮できることが分かった白金チューブ反応コイルのフローインジェクション分析FIA法への適用について詳細な検討を行った結果D-グルコースを標準物質としたとき検量線は0100 ppmの範囲で良好な直線性を示したS/N3に相当する検出限界は0.01 ppmであり5102050100 ppmのD-グルコースに対する相対標準偏差はそれぞれ0.90.80.80.51.4であった本FIA法は排水のCOD迅速定量に適用可能でありまたCODモニターとして利用できる

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Rapid and simple determination of chemical oxygen demand (COD) with potassium permanganate as an oxidizing agent by a flow-injection technique using a platinum-tube reactor