Table 8 FTIR-based indices used for structural analysis and comparison of asphaltene samples.
From: Influence of inorganic scale formation on asphaltene behavior during water injection
Index | Polarity index | Aromaticity index | Aliphatic index |
|---|---|---|---|
Calculation formula (based on FTIR peak areas) | A3400/∑A | (A3040 + A1600 + A864 + A801 + A754)/∑A | (A2962 + A2921 + A2851 + A1450 + A1374 + A727)/∑A |
Index | Sulfoxide index | Carbonyl index | H/C ratio index |
Calculation formula (based on FTIR peak areas) | A1030/∑A | A1700/∑A | (A3040 + A864 + A801 + A754)/A1600 |
Index | Aliphatic chain length index | Long aliphatic chain index | Total area (∑A) |
Calculation formula (based on FTIR peak areas) | A2962/A2921 | A727/(A1450 + A1374) | ∑A = A3400 + A3040 + A2962 + A2921 + A2851 + A1700 + A1600 + A1450 + A1374 + A1269 + A1116 + A1030 + A864 + A801 + A754 + A727 |
