ASTM D4377 Standard Test Method for Water in Crude Oils by Potentiometric Karl F
ASTM D4377 Standard Test Method for Water in Crude Oils by Potentiometric Karl Fischer Titration
3. Summary of Test Method
3.1 After homogenizing the crude oil with a mixer, an aliquot of the crude, in a mixed solvent, is titrated to an electrometric end-point using Karl Fischer reagent.
4. Significance and Use
4.1 A knowledge of the water content of crude oil is important in the refining, purchase, sale, or transfer of crude oils.
5. Interferences
5.1 A number of substances and class of compounds associated with condensation or oxidation-reduction reactions interfere in the determination of water by Karl Fischer. In crude oils, the most common interferences are mercaptans and sulfides. At levels of less than 500 µg/g (ppm) (as sulfur) the interference from these compounds is insignificant. For more information on substances that interfere in the determination of water using the (Karl Fischer reagent) titration method see Test Method E203.
3. Summary of Test Method
3.1 After homogenizing the crude oil with a mixer, an aliquot of the crude, in a mixed solvent, is titrated to an electrometric end-point using Karl Fischer reagent.
4. Significance and Use
4.1 A knowledge of the water content of crude oil is important in the refining, purchase, sale, or transfer of crude oils.
5. Interferences
5.1 A number of substances and class of compounds associated with condensation or oxidation-reduction reactions interfere in the determination of water by Karl Fischer. In crude oils, the most common interferences are mercaptans and sulfides. At levels of less than 500 µg/g (ppm) (as sulfur) the interference from these compounds is insignificant. For more information on substances that interfere in the determination of water using the (Karl Fischer reagent) titration method see Test Method E203.