Karl Fischer Moisture Analyzer - ADP-513 Moisture Evaporator for Petroleum Products

ASTM D6304 Determination of Water Content in Petroleum Products, Lubricants, and Additives Karl Fischer Coulombic Titration Method (Water Evaporator Indirect Titration Method).
ASTM D6304 - 16e1 Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration.
Procedure C(Water Evaporator Accessory)

GB/T 11133-2015 Determination of Water Content in Petroleum Products, Lubricants and Additives Karl Fischer Coulombic Titration Method

This standard also specifies the method for indirectly determining the water content of a sample. The water in the sample is separated by heating and then loaded into a Karl Fischer titration apparatus for analysis using a dry inert gas. The interference of thiols, sulfides, sulfur, and other compounds on the test method is as follows.
When using the Karl Fischer method to determine water content, many substances and mixtures can interfere with the measurement due to condensation or redox reactions. The most common interferences in petroleum products come from thiols and sulfides. When the mass fraction of water content in the sample is greater than 0.02%, if the sulfur content of these compounds is less than 500mg/kg, their interference in water content determination is negligible. For more information on interfering substances in the Karl Fischer method for determining water content, please refer to ASTM E203 method. In addition, selecting appropriate reagents can also overcome the influence of some interferences, such as the interference of ketones.
When using the Karl Fischer method to determine the water content of samples ranging from 10mg/kg to 200mg/kg, the degree of interference caused by thiols and sulfides has not been experimentally verified. However, for samples with such low water content, if the concentration of thiols and sulfides calculated as sulfur is greater than 500mg/kg, it will have a significant impact on the determination.

Test Step C (Indirect Titration Method with Moisture Evaporator)
The indirect titration method using a water evaporator is suitable for samples that cannot be directly titrated according to steps A or B due to high viscosity, interference reactions, or low water content (e.g. less than 100mg/kg). Before the experiment, add white oil to the evaporator attachment and blow it with dry nitrogen gas at a flow rate of 300mL/min. Heat the white oil to the heating temperature recommended by the instrument manufacturer for a specific instrument type.
Accurately weigh 5g ± 0.01g of viscous sample and add it to a 10mL volumetric flask. Add anhydrous n-hexane to the mark. Shake the volumetric flask until the sample is completely dissolved.
Inject 1mL of dissolved sample into the evaporator. Follow the process of step A "direct titration method for quality" and start the operation. After reaching the endpoint of titration, record the micrograms of water displayed on the digital monitor.

Karl Fischer Moisture Analyzer - ADP-513 Moisture Evaporator for Petroleum Products Main Features:

1. Suitable for moisture determination of lubricating oil, grease, tar like products, coatings or other viscous liquid samples.
2. Transparent heating glass allows observation of the heating and evaporation process of the sample.
3. PID temperature control, precise temperature control.
4. Suitable for the determination of samples with interfering substances.

Karl Fischer Moisture Analyzer - ADP-513 Moisture Evaporator for Petroleum Products Technical Parameters:

Heating method: Bottom heating furnace.
Heating temperature range: room temperature to 200 ° C.
Flow range: 100-300mL/min.
Evaporator: Transparent heating glass, capacity: 100mL.
High temperature protection: equipped with overheat fuses.
Carrier gas: Nitrogen, to be prepared by the customer.
Power Supply: 100-120V, 220-240V, 50/60Hz, 400W.
Size: 320 (W) × 210 (D) × 330 (H) mm.
Weight: Approximately 6kg.