|OELCHECK test instrument:||PerkinElmer Lambda 365+ UV-VIS Spectrophotometer|
|Sample volume:||20 ml|
|Test result:||Determination of the content of free and bound aldehyde in AdBlue, calculated as formaldehyde.|
|Result range:||0,5 mg/kg – 10 mg/kg|
|Brief description:||Formaldehyde forms a violet color complex with chromotropic acid in a strongly sulfuric acid solution with an absorption maximum at 565 nm. |
With a UV/VIS spectrophotometer, the formaldehyde content can be determined using a calibration curve prepared from formaldehyde standard solutions.
|Statement:||The determination of the aldehyde content is an essential quality criterion for the release of AdBlue according to ISO 22241-1.|
|Underlying test standard:||ISO 22241-2 Anhang F|