This method is used in conjunction with Ministry of Water, Land and Air Protection (MWLAP) methods for Extractable Petroleum Hydrocarbons in Solids and Water by GC-FID. The method uses silica gel to physically separate the components of Extractable Petroleum Hydrocarbons (EPH) based on their polarities, producing two ?fractions? for further analysis: an aliphatic fraction and an aromatic fraction. Each of these fractions is then analyzed by GC-FID using the same procedures as for EPH10-19 and EPH19-32 in solids or water. Highly polar sample components are irreversibly retained on the silica gel, and are not analyzed. Thus, for a given EPH boiling point fraction, the sum of the aliphatic and aromatic EPH results should be less than or equal to the unfractionated EPH result (within the range of normal analytical variability). The method can be used as a means to distinguish between naturally occurring and petroleum based hydrocarbons, based on the premise that most naturally occurring hydrocarbons are polar, an
BC Ministry of Water Land and Air Protection. 2003. Analytical method 7 for contaminated sites Aliphatic/Aromatic Separation of Extractable Petroleum Hydrocarbons in Solids or Water by Silica gel Fractionation. BC Ministry of Water Land and Air Protection
Keywords: wlap, water, land and air protection, extractable petroleum hydrocarbons in solids and water, gc-fid
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