KBr is a popular choice for IR sample preparation due to several key reasons.
Why KBr is Suitable for IR Sample Preparation? 5 Key Reasons Explained
1. Optical Transparency
KBr is optically transparent in the fingerprint region of IR spectroscopy.
This means it allows infrared radiation to pass through without significant absorption or scattering.
When a sample is mixed with KBr and compressed into a pellet, the pellet remains mostly transparent to infrared light.
This transparency is crucial for obtaining clear and accurate IR spectra.
2. Compatibility with IR Spectroscopy
KBr has a refractive index that matches well with the infrared beam used in spectroscopy.
This ensures minimal reflection or refraction of the infrared light at the sample-KBr interface.
As a result, accurate measurements of the sample can be made.
3. Dilution of Sample
To study the molecular structure of a powder sample using IR spectroscopy, the sample needs to be diluted in a transparent material.
KBr serves as an ideal diluent because it is chemically inert and does not interfere with the sample's infrared spectrum.
By mixing a small amount of the sample with a larger amount of KBr, a dilute quantity of the sample is incorporated into the pellet, allowing for detection within the range of the FTIR instrument.
4. Pellet Formation
KBr can be easily pressed into a solid pellet using a hydraulic press.
The uniform force applied during pressing ensures that the resulting pellet is of consistent thickness and quality.
This facilitates reproducible and accurate measurements during IR spectroscopy.
5. Sample Concentration Control
The concentration of the sample in KBr can be controlled by adjusting the ratio of sample to KBr.
It is recommended to have a sample concentration in the range of 0.2 to 1 percent.
Higher concentrations can lead to difficulties in obtaining clear pellets and result in noisy spectra.
Overall, KBr is a suitable material for IR sample preparation due to its optical transparency, compatibility with IR spectroscopy, ability to dilute the sample, ease of pellet formation, and control over sample concentration.
These properties make KBr an essential component in obtaining reliable and informative IR spectra.
Continue exploring, consult our experts
Enhance your IR spectroscopy analysis with KINTEK's high-quality KBr pellets!
Our KBr is optically transparent in the fingerprint region, ensuring accurate and reliable results.
Use KINTEK's KBr as a carrier or diluent for your solid samples, achieving the perfect ratio for optimal analysis.
Don't settle for less when it comes to sample preparation - choose KINTEK for superior IR spectroscopy.
Upgrade your laboratory equipment today!
