Since 1992, when the first emission standard Euro 1 was introduced, maximum limits for the emission of air pollutants such as carbon monoxide (CO) and nitrous oxides (NOx) were set for newly registered vehicles. To meet the decreasing maximum NOx emission limits, new technologies primarily for diesel engines had to be developed.
The selective catalytic reduction (SCR) has proven effective to reduce the emission of NOx from diesel engines using an additional, finely dosed fluid. It is a synthetically produced aqueous solution of urea that is marketed under the name of AdBlue® and stored in an extra tank inside the vehicle. Applying the SCR technology, AdBlue® is injected into the exhaust stream. The released ammonia reduces the nitrous oxides to nitrogen and water at the catalyst’s surface.
This report describes the basic methodology for the analysis of AdBlue® following ISO 22241-2. It presents typical detection limits for required elements together with studies on precision and accuracy using spike recovery measurements and the analysis of a control sample.
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