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Analysis of Aromatic Hydrocarbons in Middle Distillates with HPLC using IP Standard Method 391/95

Abstract: For the analysis of non-aromatics and aromatics in diesel fuel and petroleum distillates boiling in the range 150 ºC to 400 ºC, there exists an IP Method (391/95), which uses HPLC with refractive index detection. The two compound classes (aromatics and non-aromatics) were separated using normal phase HPLC and a column which has little affinity for non-aromatic but pronounced selectivity for aromatic hydrocarbons. In order to avoid long retention times due to late elution of polyaromatic hydrocarbons (PAHs) the column was backflushed after the elution of the di-aromatic hydrocarbons to elute the PAHs as a single sharp band. The refractive index detector was used because this detector responds to both non-aromatic and aromatic hydrocarbons.

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