Description
Karl Fisher water determination is an analytical chemical method that uses coulometric titration or volumetric titration to determine traces of water in a sample. The method was invented in 1935 by the German chemist Karl Fisher, and corresponds to standard NF EN ISO 12937, which is an administrative specification for diesel, non-road diesel (NRG) and domestic heating oil (FOD). Administrative specifications allow a maximum of 200 mg of water per kg of diesel or heating oil.
Jet fuel is the fuel requiring the greatest vigilance with regard to the presence of water. The AFQRJOS (Aviation Fuel Quality For Jointly Operated Systems) specifications call for control of the jet fuel's ability to release the water it contains. This must be treated by decantation and filtration. The standardized Micro Separometer Rating ASTM D 3948 measures the ability of a jet fuel to release water when it passes through a coalescing medium. However, the Karl Fisher method, although not part of the AFQRJOS specifications, can also be applied to jet fuels to measure water.
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