Proficiency testing for Thiocyanate in water from a Coke plant

Henrik Aldén and Pelle Homman

A proficiency test on determination of thiocyanate in water from a coking plant has been carried out. Nine laboratories from six European countries participated using their normal analytical methods. The standard deviation between laboratories for thiocyanate levels of 300-320 ppm was about 35 ppm (11-12 % relative standard deviation) which seems acceptable given that several different methods were used.