Ver.1.36
5-9
5.5 SAMPLE PREPARATIONS
In the Single-Shot analysis (flash pyrolysis) using Py-GC/MS, a sample form, shape and condition
affect results as well as the reproducibility. If the sample is soluble in a solvent, it is recommended to
dissolve it in the solvent, place in a sample cup, and evaporate the solvent to form a film on the
surface of the sample cup. If the sample is insoluble in solvents, it is recommended to pulverize it into
a fine powder. The amount of sample needed is usually 0.1 mg or less. Thermal desorption and EGA
analysis may require more depending on target compounds.
Granular or chunk polymer samples are not uniform in sample shapes, and have low thermal
conductivities, resulting in a poor reproducibility of pyrograms. If this is the case, you may need to use
a small amount of sample or to make a thin film or powder.
There are four methods to make a film or powder out of solid samples. Out of these methods A1), A2)
and A3) are easiest; however, A1) and A2) are recommended in the point of view of obtainment of
good reproducibility.
When preparing samples, organic solvents and knife or blade with
sharp edge are used. For your safety, wear protective gloves and
safety goggles.
CAUTION
!
