4.3. Chemical Components of Petroleum
4.3.1. Total Petroleum Hydrocarbons
Typically, the first step in forensic oil fingerprinting is screening the petroleum hydrocarbons in the sample, identifying the oil type, and evaluating the weathering extent. Incorrect identification of oil type can misdirect subsequent tiered analysis, eventually leading to incorrect results. As a universal and nonspecific analytical technique, GC–FID analysis is often first used in a tiered approach. Rather than to determine individual components, it aims to identify the types of oil samples and to investigate if the oil is weathered through the overall of petroleum hydrocarbon profiles. GC–FID analysis measures normal alkanes, TPHs, and the concentration of hydrocarbon ...
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