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IR sample preparation






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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
IR sample preparation

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Slide 1

IR sample preparation

for solid samples

Slide 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

Slide 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

Slide 4

Sample preparation

  • so dry the sample well

  • because water etches the IR discs

  • and emulsifies with oil letting less light through

Slide 5

How do I make a mull?

  • grind

  • the sample

  • to a smooth

  • powder

  • add mineral oil

  • and mix it

  • well

Slide 6

What should the mull be like?

  • the mull

  • should look

  • and spread

  • like soft butter

Slide 7

use clean glovesto work with salt discs

  • put on an extra pair of gloves

  • to protect cells

  • from anything aqueous on your regular gloves

Slide 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

Slide 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

Slide 10

  • gently

  • place lid

  • on top

  • slide into position

  • in light beam

Slide 11

  • close

  • sample

  • compartment

  • remove gloves

  • before using

  • keyboard

Slide 12

to clean discs

  • add a few drops

  • of chloroform

  • to each disc

  • rub gently

  • to clean off

  • all traces of sample

Slide 13

Keep discs dry

  • replace

  • in desiccator

  • after cleaning


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