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| oil sample | API gravity (McKinsey, 2022) | asphaltene concentration-mg g–1 | absorption of C–N group (1250 cm–1) | absorption of carboxyl group (1376 cm–1) |
|---|---|---|---|---|
| Gullfaks | 36.0 | 10.77 | 0.050 | 0.075 |
| Arab Heavy | 28.0 | 37.77 | 0.080 | 0.145 |
| Terra Nova | 33.2 | 12.75 | 0.065 | 0.095 |
| Mesa 30 | 30.0 | 22.28 | 0.072 | 0.130 |
