What is Coulometric Karl Fischer Titration?

Coulometric Karl Fischer Titration (CKFT) is an analytical technique used to determine the moisture content of a sample. It is based on the reaction between water and iodine in the presence of sulfur dioxide. The iodine is generated electrochemically, and the amount of iodine generated is directly proportional to the amount of water in the sample.

How does CKFT work?

CKFT is performed using a specialized titration cell that contains two electrodes, a working electrode, and a counter electrode. The working electrode is made of platinum, and the counter electrode is made of silver. The titration cell also contains a solution of iodine in methanol.

When a sample containing water is added to the titration cell, the water reacts with the iodine to form hydrogen iodide (HI) and iodine trichloride (ICl3). The HI is then oxidized by the working electrode to form iodine and hydrogen gas. The iodine reacts with the sulfur dioxide to form iodine trichloride. The amount of iodine generated is directly proportional to the amount of water in the sample.

What equipment is used for moisture testing?

* KF oven
* KF coulometer
* Titration cell
* Analytical balance
* Volumetric pipettes
* Desiccator

Advantages of CKFT

* CKFT is a very accurate and precise method for determining the moisture content of a sample.
* CKFT is a relatively simple and easy-to-use technique.
* CKFT is a non-destructive technique, so it can be used to test samples that cannot be damaged.
* CKFT is a versatile technique that can be used to test a wide variety of samples, including solids, liquids, and gases.

Disadvantages of CKFT

* CKFT can be time-consuming, especially for samples with low moisture content.
* CKFT is not suitable for testing samples that contain volatile solvents.
* CKFT can be expensive, especially if the required equipment is not already available.