For crude oil analysis, UV-Vis detector not suitable;  if possible better to go with ELSD or Combined FID for S.A.R.A . Check the attachment for your further reference:

All the Best.

For crude oil actually the best system is GC, GC-MS. Universal column for Alkanes will allow to get fingerprint and etc. By  HPLC (UV-VIS)  you can analyse PAHs. 

Hi, Tatiana,  Crude oil is a complex mixture of  hydrocarbons having different boiling points. Normally petroleum products are analyzed by GC or GCMS. A conventional GC with an FID also can be used for this analysis as hydrocarbons have very good response towards FID. You can use a non-polar capillary column for this separation. The longer the column, better will be the resolution. There are many good capillary columns available for petroleum products. You can get these information by checking the web site of  Restek  ( Rtx / Rxi series columns). 

Agree with Dinara about PAHs on HPLC. If you have access to GC or can purchase one, GC-FID/PID is your best bet for hydrocarbon range. EPA 8015 GRO and DRO are validated methods that should cover your needed range.

Thank you so much for your answers. I do have these equipments in my laboratory:

- GC-MS Autosampler, Thermo Scientific (Trace 1210 GC, TSQ Duo MS)

-  GC-MS Autosampler, Agilent Technologies (7890B GC, 5977A MSD)

You can use C18 column. Good luck

I think SARA analysis is unique and cannot be replace easily by HPLC or GC. Especially the quantification of the asphaltenes will be a problem. GC will only show the volatile compounds, mainly the aromatics and saturates and some of the resin fraction. HPLC-UV does not detect the saturates. Quantification with HPLC-ELSD is also tricky and a large error should be accepted.

Hi, I have attached an article where they used AMD-HPLC for crude oil/bitumen. Hope that it will help in your research.