KBr is a common choice for FTIR sample preparation due to its unique properties that make it ideal for this purpose.
4 Key Reasons Why KBr is Used in FTIR Sample Preparation
1. Transparency to Infrared Light
KBr is transparent to infrared light, which is essential for FTIR spectroscopy.
In FTIR, the sample is exposed to infrared light, and the resulting light is analyzed to determine the chemical bonds and their vibrations.
If the sample or the matrix used to hold the sample is not transparent, it can block the light, leading to unreliable data.
By using KBr, which is nearly transparent in the infrared region, the sample can be effectively analyzed without significant interference from the matrix material.
2. Sample Preparation Technique
For FTIR analysis, the sample is typically mixed with KBr and then pressed into a pellet.
This method allows for a consistent and thin sample distribution, which is essential for obtaining clear and interpretable spectra.
The standard procedure involves grinding the sample with an excess of KBr and pressing it into a pellet using a die.
The pellet is usually made with just 1% sample by weight, ensuring that the KBr matrix does not interfere with the analysis.
3. Hygroscopic Nature of KBr
KBr is hygroscopic, meaning it can absorb moisture from the air.
This property can affect the FTIR measurements if not properly managed.
To mitigate this, sample preparation can be conducted in a controlled environment such as a glovebox or using a vacuum die.
These methods help to prevent the KBr from absorbing moisture, ensuring that the FTIR measurements are not influenced by water absorption bands.
4. Compatibility and Common Use
KBr is widely used in FTIR sample preparation because it is compatible with the spectroscopic technique and has been proven effective over time.
Its common use also means that many laboratories are equipped to handle KBr-based sample preparation, making it a practical choice for routine FTIR analysis.
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