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2024 Proficiency Test (PT) on Naphtha P(IO)NA started


The letter of instructions can be downloaded here as a pdf document. To download a document, please click the right mouse button and choose the "save as" option.


Please download the instructions for the PT iis24N02 here: the letter of instructions


Summary of this proficiency test:


On 13 March 2024 the proficiency test on Naphtha P(IO)NA  started with 67 participants from 33 different countries. On that date, the samples were dispatched to the laboratories. Enclosed to the sample is the material safety data sheet (MSDS).

Please confirm sample receipt as soon as you have received and checked the contents of the sample package via Please enter the date of receipt and press the "save date" button.


The samples can be analyzed on: Acetone, DIPE, MEK, Methanol, Ethanol, MTBE, TAME, Total oxygenates; PIONA: Total Paraffins, n-Paraffins, i-Paraffins, Naphtenes, Aromatics, C4 and lighter hydrocarbons; PNA: Total Paraffins, Total Naphthenes, Total Aromatics, C4 and lighter hydrocarbons; DHA: Pentane, Benzene, Cyclohexane, 2-Methylpentane, 3-Methylpentane, Heptane, Toluene, Octane. 


  The deadline for reporting results is set on  19 April 2024. A laboratory that reports test results after the deadline will definitely not get direct feedback in case any of its results are suspect! So be in good time to get the most out of this proficiency test.

The test results should be reported via our internet based results reporting platform A login and a password can be requested via email to





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