| OELCHECK test instrument: | PerkinElmer Lambda 365+ UV-VIS Spectrophotometer |
| Sample volume: | 20 ml |
| Unit: | mg/kg |
| 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 |
| Analysis for: | AdBlue |
| 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 |
