This product is a mixture of water with 32.5% of synthetic urea. It is injected directly into the exhaust line and hydrolysed above 180°C to form ammoniac. In SCR, the chemical reaction consists of converting NOx into nitrogen and water. There are precautions to take to store the product (cold, light, etc.) and the slightest contamination can disturb operation of the calculator.

Examples of available analyses:

Emission spectrometry to monitor the content of metals, in particular that of certain elements which should be limited to prevent deterioration of the processing system (Cu, Zn, Ni, Cr, etc.).

NH3 alkalinity is measured to check whether the product was not transformed before use.

AdBlue filtering onto a membrane to observe through a microscope whether there are any external solid contaminants, often the cause of premature wear of the injection nozzle.

Contamination by other products.  We have developed separation techniques to identify the presence of liquid contaminants (diesel, petrol, cooling fluid, etc.). In many cases, we can identify the contaminant by further analyses.

Infrared spectrometry to identify AdBlue.