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IR sample preparation - for solid samples


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.

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IR sample preparation

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Presentation Transcript


Ir sample preparation l.jpg

IR sample preparation

for solid samples


What is a mull l.jpg

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 l.jpg

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 l.jpg

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 l.jpg

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 l.jpg

What should the mull be like?

  • the mull

  • should look

  • and spread

  • like soft butter


Use clean gloves to work with salt discs l.jpg

use clean glovesto work with salt discs

  • put on an extra pair of gloves

  • to protect cells

  • from anything aqueous on your regular gloves


Applying the mull l.jpg

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 l.jpg

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


Slide10 l.jpg

  • gently

  • place lid

  • on top

  • slide into position

  • in light beam


Slide11 l.jpg

  • close

  • sample

  • compartment

  • remove gloves

  • before using

  • keyboard


To clean discs l.jpg

to clean discs

  • add a few drops

  • of chloroform

  • to each disc

  • rub gently

  • to clean off

  • all traces of sample


Keep discs dry l.jpg

Keep discs dry

  • replace

  • in desiccator

  • after cleaning