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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

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Presentation Transcript
ir sample preparation

IR sample preparation

for solid samples

what is a mull
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
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
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
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
What should the mull be like?
  • the mull
  • should look
  • and spread
  • like soft butter
use clean gloves to work with salt discs
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
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
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
gently
  • place lid
  • on top
  • slide into position
  • in light beam
slide11
close
  • sample
  • compartment
  • remove gloves
  • before using
  • keyboard
to clean discs
to clean discs
  • add a few drops
  • of chloroform
  • to each disc
  • rub gently
  • to clean off
  • all traces of sample
keep discs dry
Keep discs dry
  • replace
  • in desiccator
  • after cleaning
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