Table 2. Summary of the toxicity of mine (MS) and synthetic (SS) seepage water from SNM to Chlorella sp and Moinodaphnia macleayi.
| Species/samplenumber/seepage type | Toxicitya | ||||||
| IC10 b | IC25 | IC50 | |||||
| % dilution | EC (µS/cm) | % dilution | EC (µS/cm) | % dilution | EC (µS/cm) | ||
| Chlorella sp. | |||||||
| Sample 1 | MSc | 37 (31–43)d | 990(852–1130) | 60 (54–66) | 1520(1380–1660) | >100 | >2320 |
| SSc | 47 (39–58) | 1180(1000–1430) | >100 | >2320 | >100 | >2390 | |
| Sample 2 | MS | 60 (46–69) | 1970(1550–2240) | 91 (73-NCe) | 2900(2360-NC) | >100 | >3090 |
| SS | >100 | >3060 | >100 | >3060 | >100 | >3060 | |
| Moinodaphnia macleayi | |||||||
| Sample 2 | MS | 13 (8–14) | 534(362–568) | 15 (10–18) | 602(431–705) | 21 (17–26) | 807 (670–978) |
| SS | 8 (2–26) | 357(156–959) | 25 (9–30) | 925(390–1090)) | 34 (26–38) | 1230 (959–1360) | |
Toxicity estimates are presented as percent seepage water as well as electrical conductivity (EC).
a
Median inhibition concentrations (IC50) not reported as all effects were less than 50%.
b
IC10, IC25, IC50: concentration resulting in a 10%, 25% and 50% inhibition of response relative to the control, respectively;
c
MS: mine seepage; SS: synthetic seepage.
d
Values in parentheses represent 95% confidence limits.
e
NC: Not calculable.