Table 2.
The three additional cases of elemental limits.
| Cases | C | H | O | H/C | O/C | N | S | P | 13C | References |
|---|---|---|---|---|---|---|---|---|---|---|
| Case I | 1–50 | 2–73 | 1–26 | 3.0 | 1.2 | 3 | 2 | 2 | 1 | 22,40 |
| Case II | 1–60 | 1-120 | 1–30 | 2.5 | 1.2 | 5 | 3 | 2 | 1 | 25,41 |
| Case III | 1–40 | 1–82 | 1–40 | 2.5 | 1.0 | 3 | 2 | 1 | 1 | 42,21 |
In Case I, the hydrogen-to-carbon (H/C) ratio of the original case was adjusted from 2.5 to 3.0. Case II altered the atomic limits for carbon (C), nitrogen (N) and sulfur (S), while maintaining the same H/C and oxygen-to-carbon (O/C) ratios. In Case III, the O/C ratio, the atomic limits for carbon (C) and phosphorus (P) were modified. These cases were identified through a review of the literature.