MACHEREY-NAGEL VISOCOLOR ECO Test kit Iron 2

MACHEREY-NAGEL VISOCOLOR ECO Test kit/ Iron 2

VISOCOLOR ECO presents a product group of colorimetric and titrimetric test kits which avoids hazardous substances wherever possible. With VISOCOLOR ECO even water constituents with low limiting values can be determined with sufficient accuracy. All VISOCOLOR ECO test kits are packed in an environment-friendly box and contain easy to understand instructions in 6 languages.

Colorimetric Tests
Principle: Colorimetry with color comparison card

• visual and photometric evaluation
• (with PF-12 / photino)
• environment-friendly
• economically priced
• convenient handling
• higher accuracy and sensitivity
• with pictographic instructions
• reagent bottles with clear dosing instructions c
• ompensation of turbidities and colors
• refill packs available

Titration Tests
Principle: Titration with drop counting

• visual evaluation
• environment-friendly, without toxic reagents
• economically priced
• convenient handling
• higher accuracy and sensitivity
• sharper color change due to separated
• dropping reagents
• reagent bottles with clear dosing instructions

MACHEREY-NAGEL VISOCOLOR ECO Test kit Iron 2
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.

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.