I have taken biphenyl in ethyl acetate 8mg/2ml at 280 degree GC operating conditions- gc temperature, but there is no peaks except solvent peak. Kindly suggest a injection temperature, GC oven temperature, sample concentration and solvent.
I suggest you first look for application notes for the target compound you want to analyse for, then modify from there.
I am sorry that I am not able to provide suggestion as there are too little information provided on your current setting. Example on the information would be: oven programming, Injector temperature, injection method- split/splitless, if split, what is the split ratio, column type (column ID and material) detector coupled with your GC.