The disadvantages of using KBr as a sample holder include:
1. Hygroscopic nature: KBr has a tendency to absorb moisture from the air, which can affect the accuracy and reliability of the sample analysis in techniques such as FTIR (Fourier Transform Infrared Spectroscopy).
2. Fragility: KBr pellets can be easily broken, especially during the process of making the pellets. This can lead to loss of the sample and the need for additional time and resources to prepare new pellets.
3. Time-consuming process: Creating KBr pellets can be a time-consuming process, especially when using hand presses. This can be a drawback when large quantities of pellets need to be prepared.
4. Large amount of reagent required: The preparation of KBr pellets typically requires a relatively large amount of pure KBr reagent. This can be costly, especially when working with expensive or limited samples.
5. Special equipment needed: To prepare KBr pellets, a special hydraulic press machine is often required. This can add to the cost and complexity of the analysis process.
6. Limited storage capability: Hand-operated presses, commonly used for KBr pellet preparation, may not be suitable for creating samples that can be stored for future reference. This can be a disadvantage when long-term sample storage is necessary.
Overall, while KBr is widely used as a sample holder in various analytical techniques, it has some drawbacks related to its hygroscopic nature, fragility, time-consuming preparation process, and the need for special equipment. These factors should be taken into consideration when using KBr as a sample holder in analytical applications.
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