Reagents for Macherey Nagel water test systems
NANOCOLOR® Reagent Tube Tests
Compact Multiparameter Photometer PF-12 Plus
For easy and fast measurements
Using NANOCOLOR® bar coded test tubes, the measurement is automatically performed after inserting the cuvette into the cuvette slot. The contact with any dangerous chemicals is avoided because the measurement is performed directly in the test tube. This guarantees maximum safety for the user.
Reliable and comparable results
The reaction basis of NANOCOLOR® tests is based on international approved standard methods like DIN-, EN-, ISO-, EPA- and APHA.
Easy handling and highest accuracy
All NANOCOLOR® tests contain accurate predosed reagents, that are directly ready to use and calibrated accessories.
The perfect test for every request
For all important parameters in water and wastewater analysis, a large number of tests with different ranges is available.
No mix up of tests Every
NANOCOLOR® test box is equipped with a colour coded label and can be identified clearly by its colour.
A full overview of all reagents and equipment can be found in the NANOCOLOR Analysis System Brochure.
The sample should be thoroughly mixed or homogenized in a blender to be as representative as possible for the COD of the water to be examined.
COD determinations should be performed as soon as possible after sampling. If this is not possible, the pH should be reduced to 2 or less by the addition of 2 mL of concentrated sulphuric acid H2SO4 per 1 L of sample.
Storage of the acidified sample at room temperature: Analysis within 7 days.
Storage of the acidified sample at 4 °C: Analysis within 28 days.
Rapid decomposition is not possible for all COD tests. Depending on the composition of the test, the water content can be higher. This results in a higher vapour pressure during the decomposition and increases the risk for bursting of the test tube. For more information about decomposition, please see the respective instruction leaflet.
PHP (potassium hydrogen phthalate) is used as a reference substance.
For cumulative parameters, the sample must not be filtered prior to decomposition! By filtration, compounds which are poorly soluble are removed. Those compounds would thereby escape the detection which would lead to wrong results.
For a determination of dissolved COD, filtration of turbid samples using the membrane filtration kit 0.45 µm (REF 91650 / 91652) or glass fibre paper MN 85/90 BF is recommended. These filters are tested and validated specifically for this purpose.
Seawater analysis is generally not possible because of chloride interferences.