To clean KBr pellets, the process involves several steps to ensure the removal of any residual sample and to maintain the transparency and integrity of the pellet for future use. Here is a detailed explanation of the cleaning process:
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Initial Removal of the Pellet: After the analysis, the KBr pellet is typically removed from the collar. This can be done by rinsing the collar with water or by ejecting the pellet if the setup allows for it. The goal is to separate the pellet from the equipment used for analysis.
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Washing with Organic Solvents: The pellet should then be washed several times with methylene chloride to remove any organic residues. This step is crucial as methylene chloride is effective at dissolving many organic compounds without affecting the KBr matrix.
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Further Cleaning with Ethanol: After washing with methylene chloride, the pellet is then washed with ethanol. This helps in removing any remaining traces of the previous solvent and also helps in drying the pellet.
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Polishing: The surface of the pellet should be polished using a polishing kit available in the lab. This step is important to remove any scratches or imperfections on the surface of the pellet, ensuring it is clear and suitable for future spectroscopic analyses.
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Handling and Storage: During the cleaning process, it is important to wear gloves to prevent any fingerprints or oils from contaminating the surface of the pellet. After cleaning and polishing, the pellet should be stored in a dry and clean environment to prevent any moisture absorption or contamination.
These steps ensure that the KBr pellet is thoroughly cleaned and prepared for subsequent use, maintaining its optical properties and preventing any cross-contamination between different samples.
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