What is astm D6304?
ASTM D6304 «Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration» is a standard that is often cited for moisture determination in the specifications of various petroleum products.
What is the chemical reaction of a KF titration?
The principle of Karl Fischer titration is based on the oxidation reaction between iodine and sulphur dioxide. Water reacts with iodine and sulphur dioxide to form sulphur trioxide and hydrogen iodide. An endpoint is reached when all the water is consumed.
How do you measure moisture content in oil?
The method involves the direct codistillation of the oil sample. As the oil is heated, any water present vaporizes. The water vapors are then condensed and collected in a graduated collection tube, such that the volume of water produced by distillation can be measured as a function of the total volume of oil used.
What is ASTM D445?
ASTM D445 – Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (incl. Calculation of Dynamic Viscosity) The measurement method is based on tracking the flow time of transparent or opaque liquids through a calibrated glass capillary.
What electrode is KF titration?
double platinum electrode
The most advanced KF titration technology uses a double platinum electrode for electrochemical indication of the end point, but visual and photometric indicators are also used.
What is the composition of KF reagent?
Karl Fischer reagent consists of iodine, sulfur dioxide, a base and a solvent, such as alcohol. As described below, this method can be used in both volumetric and coulometric titration systems.
What is moisture content in oil?
Dissolved moisture is the lowest level of moisture contamination in lubricant oils. Usually, the more additives the oil contains, the more hygroscopic (water attracting) the oil will become. Acceptable levels of dissolved moisture typically range from 50-300 ppm (or 0.0050% – 0.0300%).
What is moisture content in vegetable oil?
The maximum allowed moisture content in edible oils is 0.2% [14]. The higher moisture content observed in the local products could be the poor moisture refining process as the companies are using low technology for oil production [30].
What is viscosity index ASTM D2270?
Viscosity index is a dimensionless number that represents how the viscosity of a hydraulic fluid changes with temperature. Standard ASTM D2270 calculates viscosity index in part by measuring a fluid’s kinematic viscosity at 40° and 100° C.
What is the KF reagent?
What is the Karl Fischer Reagent? The reagents consist of a solvent Alcohol (ROH), a known concentration of Iodine (I2), a Base (RN) and Sulfur dioxide (SO2). Principle of Reaction. The Bunsen reaction between iodine and sulfur dioxide in an aqueous system is the basis for the Karl Fischer Reagents reactions.
What is ASTM d6304-20?
ASTM D6304-20, Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration, ASTM International, West Conshohocken, PA, 2020, www.astm.org
What is astastm d6304-16e1 standard test method?
ASTM D6304-16e1 Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration This test method covers the direct determination of water in the range of 10 mg/kg to 25 000 mg/kg entrained water in petroleum products and hydrocarbons using automated instrumentation.
What is technique d6304?
Technique D6304 allows the utilization of coulometric generator electrodes with and without diaphragm, as seen in Figure 1. The titration cell is conditioned prior to titration of the sample. This ensures that no environmental moisture is present within the titration cell before titration.
Can the Metrohm 860 KF thermoprep be used for ASTM d6304?
The Metrohm 860 KF Thermoprep, 874 Oven Sample Processor and 885 Compact Oven Sample Changer can be used for ASTM D6304 Procedure B. The 874 Oven Sample Processor is able to carry out a temperature gradient test to establish the best temperature for removing water without degrading the sample.