WearCheck Water recently became the first laboratory in Africa to be officially ISO17025 accredited to test AdBlue/DEF (diesel exhaust fluid) by the South African National Accreditation System (SANAS). This latest achievement is added to WearCheck Water’s ISO17025:2017 accreditation for chemical and microbiological water analysis.
The company can test AdBlue/DEF solutions to make sure that Adblue manufacturers meet the required ISO 22241 standards. This analysis service will assist AdBlue/DEF manufacturers and users, OEMs, fuel depots, and large-scale truckers/ fleet managers.
SANAS is the only national body in South Africa responsible for carrying out accreditation of various entities, including laboratory testing, the relevant section which regulates WearCheck’s laboratory services.
Not the fuel tank
AdBlue is a colourless, non-toxic liquid that converts pollutants into gases which do not harm the environment. It is used in vehicles with Selective Catalytic Reduction (SCR) technology. Added to diesel engines and not the fuel tank, it is a 32,5% solution of high-purity, synthetically manufactured urea in de-mineralised water, and is safe to use.
General manager of WearCheck Water, Thelma Horsfield, says, ‘Vehicles with SCR technology have a separate tank filled with AdBlue/DEF, which is injected into the exhaust pipe, in front of the SCR catalyst, downstream of the engine. Heated in the exhaust, it decomposes into ammonia and CO₂.
Created correctly
“When the NOx from the engine exhaust reacts inside the catalyst with the ammonia, the harmful NOx molecules in the exhaust are converted to harmless nitrogen and water, which are released from the exhaust pipe as steam.
“Adblue/DEF solutions are made up to ISO 22241 standards to ensure that the mixtures are created correctly and do not harm engines.”
Analysis service
Moses Lelaka, technical manager for WearCheck Water, was instrumental in setting up and implementing the testing process, along with the company’s quality manager, Lorato Hotane.
Moses explains, ‘We offer an analysis service that includes testing titrimetric (alkalinity), gravimetric (insoluble matter), colorimetric (biuret and aldehydes), as well as the ionisation (metals). After investing in a refractometer for our laboratory, we are already conducting the tests in our Johannesburg laboratory, and will be extending the service to our Cape Town laboratory soon.’
Sample tips
Moses offers these tips for taking an Adblue sample. “Sample containers should be made of materials compatible with urea solutions, typically high-density polyethylene (HDPE) or stainless steel, and must be sealed properly to avoid contamination.
“The sampling container must not have any previous chemical residues, and it should be rinsed with distilled or deionised water before use. The sample must be representative of the entire batch, and avoid areas with potential sediment or contamination.
Compliance
“Clients should open the valve, allowing the initial few litres to flow out, and discard this liquid to remove any residual contamination from the sampling point. Thereafter, they should fill the container, seal and label it, and store it in a cool, dry place until it is tested.
“The sample will be tested for compliance with ISO 22241 standards, checking for properties like urea concentration, alkalinity, biuret content, and other contaminants,” he concludes.
