Presentation Profile
Modern, Fast, Accurate, and Reliable Petrochemical Analysis by UHPLC
Currently Scheduled: 10/15/2019 - 11:30 AM - 12:00 PM
Room: Floral Hall A2
Main Author
Nicholas Santiago - Thermo Fisher Scientific
Abstract:
ASTM D6379-11: Det. Of Aromatic Hydrocarbons from Jet Fuel & Petroleum Distillates ASTM D1319 determines saturates, olefins, and aromatics in petroleum samples, including those in the gasoline-range, of fluorescent dyes, followed by solvent elution to separate the saturates, olefins, and aromatics, as well as the dyes. Dye boundaries on the silica column, noted by ultraviolet light, are used to mark the appropriate fractions. The length of each fraction is representative of its volume percent in the original sample. As you might imagine for a low-efficiency silica adsorption-column, the “cuts” between fractions are not clean, so some olefins, like dienes, are split between the aromatics and olefins, which can bias results. In addition, improper packing of the silica column or incomplete elution of the aromatics can produce errors. Another potential problem with ASTM D1319 is contained in the following method footnote: “The sole source of supply of the standard dyed gel known to the committee at this time is produced by UOP, LLC…”. If the dye fails to properly indicate the fractions or becomes unavailable… not good. If it is required to also analyze for the poly-aromatic hydrocarbon content (tri+) for ASTM D6591 (IP391), a switching valve would be added to the system, which also cleans the column in a backflush configuration.