IR sample preparation for solid samples What is
- Slides: 13
IR sample preparation for solid samples
What is a mull? a mull a suspension of solid sample in mineral oil n It is used to make a thin-film cell from a solid sample n
Thin film IR cells Salt (Na. Cl) discs are used n To hold the sample n So the holder won’t absorb infrared light n and only sample absorption is detected n
Sample preparation n 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 n the sample n to a smooth n powder n add mineral oil n and mix it n well n
What should the mull be like? the mull n should look n and spread n like soft butter n
use clean gloves to work with salt discs put on an extra pair of gloves n to protect cells n from anything aqueous on your regular gloves n
applying the mull n n n n use a rubber policeman to spread a thin layer on one disc lower the 2 nd disc on top of the 1 st and twist the discs to spread sample evenly
placing discs in cell holder use your finger n to make a platform n in the cell holder n lower in n the Na. Cl discs n do not wedge them n
gently n place lid n on top n slide into position n in light beam n
close n sample n compartment n remove gloves n before using n keyboard n
to cleann discs add a few drops of chloroform n to each disc n rub gently n to clean off n all traces of sample n n …
Keep discs dry n n replace in desiccator after cleaning …
- Solid sample preparation for ir spectroscopy
- A homogeneous adhesive semi solid preparation
- Chem
- What is solid solution example
- Covalent network solid vs molecular solid
- Example of crystalline solid
- Crystal solid and amorphous solid
- Crystalline solid and amorphous solid
- Anisotropic
- When a solid completely penetrates another solid
- When a solid completely penetrates another solid
- Separating mixture
- Ic sample
- Ir sample preparation