MACHEREY-NAGEL VISOCOLOR HE Test kit Copper

MACHEREY-NAGEL VISOCOLOR HE Test kit/ Copper

VISOCOLOR HE test kits are highly sensitive colorimetric test kits. In comparison with conventional VISOCOLOR kits, their sensitivity is enhanced by increasing the length of the test tube and the use of highly sensitive reagents. This technique allows a 10-fold to 100-fold increase of sensitivity. Each VISOCOLOR HE test kit is packed in a sturdy plastic box which contains the comparator block with colour comparison disk and all required reagents. The VISOCOLOR titration test kits are based on principles of volumetric analysis. On the gradated syring the results can be read off in mg/l or in a second alternative dimension.

Colorimetric Test Kits
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

Titration Test Kits
Principle: High sensitive volumetric analysis with gradated syringe

• visual evaluation
• economically priced
• convenient handling
• highest accuracy due to narrow gradated syringe
• reagent bottles with clear dosing instructions
• sharper colour change due to separated
• dropping reagents
• refill packs available

MACHEREY-NAGEL VISOCOLOR HE Test kit Copper
Colorimetric determination of copper

In weakly alkaline medium copper(II) ions react with cuprizone forming a blue colour complex. Strongly acidic and buffered solutions have to be adjusted to pH 9 with ammonia for the test. Iron(II), chromium(VI), nickel and manganese ions interfere in concentrations above 10 mg/l. Cr(III) concentrations which exceed the copper concentration cause low results, but can be eliminated by oxidation to chromate using ammonium peroxodisulphate / sulphuric acid). Cobalt ions form a red colour complex which, depending on the copper concentration, can already interfere above 1 mg/l. Cyanides and sulphides present in excess of 1 mg/l cause low results.

In water copper(II) can be found in dissolved as well as in undissolved form. Copper(I) compounds and undissolved copper(II) compounds are not determined unless they are decomposed with concentrated nitric acid prior to the test.