IR sample preparation

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What is a mull?. a mull a suspension of solid sample in mineral oilIt is used to make a thin-film cell from a solid sample. Thin film IR cells. Salt (NaCl) discs are usedTo hold the sampleSo the holder won\'t absorb infrared lightand only sample absorption is detected. Sample preparation. so dry the sample wellbecause water etches the IR discsand emulsifies with oil letting less light through.
IR sample preparation

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1. IR sample preparation for solid samples

2. What is a mull? a mull a suspension of solid sample in mineral oil It is used to make a thin-film cell from a solid sample

3. Thin film IR cells Salt (NaCl) discs are used To hold the sample So the holder won?t absorb infrared light and only sample absorption is detected

4. Sample preparation so dry the sample well because water etches the IR discs and emulsifies with oil letting less light through

5. How do I make a mull? grind the sample to a smooth powder add mineral oil and mix it well

6. What should the mull be like? the mull should look and spread like soft butter

7. use clean gloves to work with salt discs put on an extra pair of gloves to protect cells from anything aqueous on your regular gloves

8. applying the mull use a rubber policeman to spread a thin layer on one disc lower the 2nd disc on top of the 1st and twist the discs to spread sample evenly

9. placing discs in cell holder use your finger to make a platform in the cell holder lower in the NaCl discs do not wedge them

10. gently place lid on top slide into position in light beam

11. close sample compartment remove gloves before using keyboard

12. to clean discs add a few drops of chloroform to each disc rub gently to clean off all traces of sample ?

13. Keep discs dry replace in desiccator after cleaning ?

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