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  • หน้าแรก>>Products>>Water Test Kits P - Z>>Dissolved Oxygen Test Kits>>ชุดทดสอบออกซิเจนละลาย (1-10 ppm.)
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    ชุดทดสอบออกซิเจนละลาย (1-10 ppm.)

    Principle:Colorimetry with colour comparison card• visual and photometric evaluation (with PF-11 / photino)
    • environment-friendly, without toxic reagents
    • economically priced
    • convenient handling
    • higher accuracy and sensitivity
    • with pictographic instructions
    • reagent bottles with clear dosing instructions
    • compensation of turbidities and colours
    • refill packs available

    Colorimetric determination of oxygen

    Oxygen determination according to Winkler: in alkaline solution dissolved oxygen oxidises manganese(II) ions to higher-valent manganese hydroxides. In a strongly acidic medium these form manganese(III) ions which can be determined either titrimetrically or colorimetrically after addition of a colour reagent. Most oxidising and reducing compounds interfere, as for example active chlorine, sulphite, sulphide, higher-valent manganese compounds. Organic compounds interfere, if the potassium permanganate consumption exceeds 60 mg/l. This interference can be circumvented by subsequent addition of ammonium hydrogen carbonate solution. 1 mg/l Fe2+ simulates 0.14 mg/l O2.
    (Reaction principle analogous to APHA 4500-O (titr.), ISO 5813 (titr.) & DIN EN 25813-G21)

    Data and ordering information
    Cat. No. 931 088 (931 288)
    Type colorimetric test kit (refill pack)

    0 · 1 · 2 · 3 · 4 · 6 · 8 · 10 mg/l O2

    Sufficient for 50 determinations
    Shelf life at least 12 months
    Sea water suitability


    Detectable with PF-11 yes

    The solubility of oxygen in water depends on the temperature, the pressure and the other components of the water. The oxygen content of a water at the time of sampling is often quoted as the percentage of the possible saturation.


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