posted on Jan, 14 2011 @ 10:42 AM
Originally posted by Cassius666
What is the DSC curve consistent with?
It is consistent with an exotherm. In air, a DSC exotherm of a carbonaceous material is likely combustion.
DSC traces are not based on intrinsic properties of the analyte. They are dependent on the conditions of analysis. An example of intrinsic properties
would be an IR absorbtion spectrum. Functional groups [such as
-OH, C=O, -CH3, -NO2, etc.) always absorb in the same regions and this allows the analyst to make conclusions as to the functional groups present in
An example of extrinsic properties would be a gas chromatogram. The trace depends on column packing or coating, column diameter and length, flow rate,
gas, detector type, temperature ramp, injection size, and solvent. Looking at an IR, one can make some immediate conclusions about the sample. Looking
at a GC, one may be able to say that there are some minimum number of components, and that the early large peak is most likely solvent containing the
analyte, but that is about it. DSC is the same way. The shape of the traces depend on the variables of analysis.