| VISOCOLOR® ECO Oxygen |
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Colorimetric determination of oxygen
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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)
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| Data and ordering information |
| Cat. No. |
931 088 (931 288) |
| Type |
colorimetric test kit (refill pack) |
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Range
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0 · 1 · 2 · 3 · 4 · 6 · 8 · 10 mg/l O2
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| Sufficient for |
50 determinations |
| Shelf life |
at least 12 months |
| Sea water suitability |
yes
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| Detectable with PF-11 |
yes |
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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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