IP 439: Petroleum products - Determination of water - Potentiometric Karl Fischer titration method
- Method adopted/last revised: 2001
- Method reapproved: None
- REF/ISBN: IP439-2934869
- Status: Current
- First printed in STM books: January 2001
-
Scope
This International Standard specifies a method for the direct determination
of water in petroleum products boiling below 390 °C. It covers the mass fraction
range 0,003 % (m/m) to 0, 100 % (m/m).
This International Standard may be
applicable to petroleum products boiling above 390 °C and lubricating base oils.
However, the precision has not been established for these materials.
NOTE 1
A number of substances and classes of compounds associated with condensation or
oxidation-reduction reactions interfere in the determination of water by Karl
Fischer titration. In petroleum products, the most common interferences are
hydrogen sulfide and mercaptan sulfur, however, concentrations of these below
0,003 % (m/m) as sulfur will not cause significant interference over the range
0,003 % (m/m) to 0,100 % (m/m) water. Other organic sulfur compounds commonly
present such as sulfides, disulfides and thiophenes, do not interfere.
NOTE 2 For the purposes of this International Standard, the terms "% (m/m)" and "% (V/V)" are used to represent the mass and volume fractions of a material respectively.
Members Benefits
Are you an EI Member? If yes, register/log in now to ensure you receive free access or discounts to EI publications.
If you are not a Member, why not join today and receive all of the benefits of EI Membership? EI Members are entitled to a 25% discount on most EI publications.