Table 3.
Cytotoxicity EC50 estimates for HepG2 cells exposed to each extract fraction for all surveyed sediment samples (in mg SEQ/mL).
| Extract fraction |
||||
|---|---|---|---|---|
| Site | 1 | 2 | 3 | 4 |
| R | – | – | – | – |
| N1 | 39.8 (34.3–45.2) | n.a. | n.a. | n.a. |
| N2 | 88.7 (82.1–95.4) | – | – | 265.3 (158.5–372.0) |
| S1 | 180.0 (162.7–197.3) | – | – | – |
| S2 | 223.5 (152.5–294.6) | – | – | 160.9 (70.1–251.8) |
[–], not computable (effect too low); n.a., data not available; fraction 1, dichloromethane:methanol (crude extract); fraction 2, n-hexane; fraction 3, dichloromethane; fraction 4, methanol; ranges indicate the lower and upper 95% confidence limits.