IR sample preparation for solid samples.

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Presentation transcript:

IR sample preparation for solid samples

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

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

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

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

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

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

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

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

gently place lid on top slide into position in light beam

close sample compartment remove gloves before using keyboard

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

Keep discs dry replace in desiccator after cleaning …