Hans-Peter Andres (METAS) gave an overview of the EMRP-ENV-02 project and the 6 deliverables and status to date. Final workshop 13-14 May 2014.
Key conclusions:

• Counting efficiency is material dependent (slide 14)
• ‘Soot likeness’ is not a good criterion as soon is intrinsically variable
• Primary calibration – recommends heterogenous nucleation of silver (using seed particles) as allows larger monodisperse size
• However, delivery to field needs a less onerous method.
• Uncertainty chain (traceability) from electrometer to CPC completed
• All 6 deliverables achieved, however, several reports still in progress.
• See link on Slide 26 for additional information

Discussion on how to translate the above into a practical chain of work – eg primary calibration by silver particles would mean sending CPC to METAS.

Secondary aerosol and transfer functions – eg could be emery oil as long as traceability through the silver particles. H-G Horn briefly outlined a procedure for traceability.