VISOCOLOR® HE Iron
Principle:High sensitivity colorimetry with comparator block and colour comparison disc• visual evaluation
• environment-friendly, without toxic reagents
• economically priced
• convenient handling
• highest accuracy due to extremely narrow gradation
• highest sensitivity down to 0.002 mg/l due to longer
• measuring tubes
• reagent bottles with clear dosing instructions
• compensation of turbidities and colours
• refill packs available
Colorimetric determination of iron
Triazine method: iron(II) ions react with a triazine derivative to form a violet complex. Iron(III) ions are reduced and thus also determined.
| Data and ordering information | |
| Cat. No. | 920 040 |
| Type | high sensitive test kit |
| Range | 0.0 · 0.01 · 0.02 · 0.03 · 0.04 · 0.05 · 0.07 · 0.10 · 0.15 · 0.20 mg/l Fe |
| Sufficient for | 300 determinations |
| Shelf life | at least 24 months |
| Sea water suitability | no |
| Detectable with PF-11 | no |
Natural waters as well as waste waters often contain some iron. It can be present as Fe(II) or Fe(III) ions if the pH value of the water is below 3 or if the water is free of oxygen. At higher pH values Fe(III) forms an insoluble oxyhydrate. Frequently the sample is in a transition state with finely dispersed iron oxides. In waste water and natural water containing humic acids iron is often present in the form of a complex salt. The VISOCOLOR® test kits only determine iron which is present in dissolved form as Fe2+or Fe3+ ions. Iron complexes are not covered unless they are decomposed by oxidation with nitric acid and sulphuric acid.
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