The water content of a BioDiesel sample is a critical
parameter in predicting the stability of the bulk product
for storage & transportation purposes. BioDiesel is very
susceptible to the effects of Oxygen, which quickly
degrades the product to the point it is unfit for service,
and high water contents (>0.1%) contribute significantly
to this process. The Karl Fischer titration method has long
been used to measure the full spectrum of water
content in a multitude of sample types - be them solid,
liquid, or gas. BioDiesel samples can be analysed using
either Coulometric KF or Volumetric KF techniques - the
preferred being Coulometric due to its high accuracy
& precision at low moisture levels (30%) or nonhomogenous
samples.