WATER BY KARL FISCHER REAGENT: ASTM D1744
TEST SUMMARY
This test method covers the determination of water in the concentration from 50 to 1000 ppm in liquid petroleum products. The material to be analyzed is titrated with standard Karl Fischer reagent to an electrometric end point. Free alkali, oxidizing and reducing agents, mercaptans, certain basic nitrogenous substances, or other materials that react with iodine, interfere. One part per million of sulfur as mercaptan causes an error in the titration, equivalent to approximately 0.2 ppm of water.
TEST PRECISION
Repeatability: 50 to 1000 ppm water content = 11 ppm
Reproducibility: Not determined
