Furanic Analysis

[Rouan]

Need some help. GC person with a little HPLC experience. I am trying to do Furanic analysis in transformer oil. When I am analysisng the individual standards I get nice symmetric peaks. But the moment I do a mixture all the peaks seems to have a front shoulder. Changing mobile phase conditions did not help. Changing concentration ranges did not help. I am at a lost.

Thanks.

[HW Mueller]

Do you inject different volumes when single st. or mixtures are used? Are there other diffs, for instance type of sample solvent?
What is furanic?

[rhaefe]

I guess it is the analysis of:

5-hydroxymethyl-2-furaldehyde
furfuryl alcohol
2-furaldehyde
2-acetylfuran
5-methyl-2-furaldehyde

in transformer oil according to ASTM D5837 - 99(2005)

My guess is also injection volume and/or some solvent effect.


rh