Table 4 Parameter estimates for the time-dependence of EC10 and EC50 concentrations for each dispersant for the three parameter exponential decay function (y = m + a * exp(−b * log(x)) where y is the EC10 or EC50 threshold concentration, x is exposure time in hours, exp(−b * log(x)) is the exponential function, m is the concentration at which an infinite exposure time would theoretically yield no effect, a is the theoretical threshold concentration at zero exposure (y-intercept) and b is the exponential rate of decay. 95% confidence intervals in parentheses.
From: Comparative toxicity of five dispersants to coral larvae
Dispersant | EC50 curve parameters | EC10 curve parameters | ||||
|---|---|---|---|---|---|---|
a | b | m | a | b | m | |
Ardrox 6120 | 29.9 | 1.67 | 3.79 | 40.2 | 2.22 | 1.85 |
(20.3–43.2) | (1.21–2.23) | (3.3–4.25) | (17.5–182) | (1.38–4.82) | (1.42–2.29) | |
Corexit EC9500A | 20.6 | 0.644 | 0.698 | 27.3 | 1.76) | 2.35 |
(18–24.4) | (0.275–1.02) | (−5.67–3.19) | (12.3–97.3) | (0.832–3.84 | (1.47–2.9) | |
Slickgone LTSW | 12 | 0.899 | 0.835 | 82.7 | 3.61 | 1.48 |
(8.6–26.3) | (0.0985–1.8) | (−14.7–2.63) | (5.63–320) | (0.793–6.71) | (1.12–1.75) | |
Slickgone NS | 38.5 | 1.06 | 8.29 | 39.5 | 0.561 | −18.7 |
(24.1–70) | (0.281–2.03) | (−2.79–12.2) | (10.5–137) | (0.0208–2.08) | (−113–6.74) | |
Finasol OSR 52 | 12.4 | 1.18 | 3.02 | 23.3 | 2.06 | 1.81 |
(8.62–18.2) | (0.653–1.77) | (2.13–3.48) | (7.22–128) | (0.911–4.98) | (1.4–2.08) | |
SDS | 9.43 | 1.06 | 0.384 | 5.83 | 1.2 | 0.219 |
(7.72–11.6) | (0.823–1.36) | (−0.0524–0.808) | (3.74–9.47) | (0.711–1.92) | (−0.196–0.6) | |
