Kadar Air Karl Fischer
Karl Fischer

What is Water Content?

Created By: Dias Fitriana | Published Date: 30 May 2022 | Last Modified: 30 May 2022

What is Water Content?

Water content is the amount of water contained in an object, such as soil, rocks, agricultural materials, fuel and so on. Moisture content is widely used in scientific and engineering fields and is expressed in a ratio, from 0 to a water saturation value where all the pores are filled with water. Water content also called water content is defined as the ratio between the weight of water and the weight of the sample volume.

For crude oil and petroleum product samples, the presence of water can cause corrosion, increase wear, and reduce viscosity. There are several things that are sources of water in lubricating oil, including cooler leak, seal leak, condensation, atmosphere (through breather, access cover, vent).
We need to know how to determine the water content in lubricants, one of the methods suggested by SNI is the Karl Fischer method.
What is the Karl Fischer Method? This method is a technique used to determine the water content in samples, both solid, liquid and gas samples. This titration was discovered in 1935 by the German chemist, Karl Fischer. The Karl Fischer reaction is based on the oxidation of sulfur dioxide by iodine with the consumption of water in a buffer solution. The titration reaches the end point when the titrating agents water and iodine are balanced.

Karl Fischer is a tool used by several industries. Karl Fischer was used as an alternative to the moisture test. Automatic Karl Fischer Titrator is widely used, one of which is Mettler Toledo, which has many types for this product and one of its superior products is the C and V series.
What is the Difference between C and V series?
The difference is that the V series (volumetric) is that iodine is added to the burette containing the sample material of a solvent during the titration process. The volume is measured based on the volume of the reactants used in the titration, suitable for determining the water content of about 100 ppm or 100%. While C (coulometric) iodine is produced electrochemically during the titration process, the measured water content lower than the volumetric value of about 1 ppm or 0.0001% can be measured.

The advantages of using the Automatic Karl Fischer Titrator tool in determining the water content of crude oil and petroleum products compared to manual titration techniques are as follows:
• No sample preparation required and measurements are performed automatically at the push of an instruction button.
• Measurement results are objective.
• It is safe for analysts or operators because it minimizes contact with reagents and does not use glassware which can be dangerous in the event of an accident.
• Less cost usage due to lower titrant consumption and maintenance costs.

Source: google, mt.com, studocu.com, saka.co.id, caesarvery.com