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IR sample preparation for solid samples.

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Presentation on theme: "IR sample preparation for solid samples."— Presentation transcript:

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?
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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