Infrared (IR) spectroscopy is a powerful analytical technique used to identify and analyze the chemical composition of various materials.
To obtain accurate and reliable results, the preparation of IR samples is crucial.
There are two primary methods for preparing IR samples: the KBr Pellet method and the Mull technique.
What are the Two Methods of Preparation of IR Samples? (2 Key Techniques Explained)
1. KBr Pellet Method
The KBr Pellet method is specifically designed for solid samples.
The sample and KBr are ground together to reduce the particle size to less than 5 mm in diameter.
A 100:1 ratio of KBr to sample is used, measured by weight.
The mixture is then pressed into a disc using a pellet die with a diameter of 13 mm and a pressing load of 10 tons.
For Fourier Transform Infrared (FTIR) applications, a 7 mm pellet can be used with a pressing load as low as 2 tons.
2. Mull Technique
The Mull technique is also used for solid samples.
The finely crushed sample is mixed with a mulling agent, such as Nujol, in a marble or agate mortar.
The mixture is ground with a pestle to create a thick paste.
A thin film of the paste is applied onto salt plates.
The salt plates with the sample film are then mounted in the path of the IR beam, and the spectrum is recorded.
Both methods aim to make the sample transparent to IR radiation, allowing the radiation to pass through and obtain an accurate IR spectrum with sharp peaks, good intensity, and high resolution.
The KBr Pellet method involves pressing the sample into a disc, while the Mull technique involves applying a thin film of the sample paste onto salt plates.
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