Skip to main content

Table 2 The 72-h growth inhibition IC50 and IC10 for algae (R. subcapitata) and 5- and 15-min IC50 for Microtox (V. fischeri)

From: Assessment of stormwater discharge contamination and toxicity for a cold-climate urban landscape

Sampling date Sampling site name Algae Microtox
EC50 (CI 95%) EC10 (CI 95%) IC50-5 min (CI 95%) IC50-15 min (CI 95%)
June 12 SCB E 92.1 (79.9–114) 30.5 (22.0–41.2)
MacPherson Ave ND 100 (NC) 49.6 (15.6– > 100) 60.8 (18.9– > 100)
17th St. W. 81.9 (73.8–92.1) 31.6 (24.9–40.0) ND 52.6 (NC)
23rd St. E. 101 (92.5–114) 47.9 (37.9–59.3) NC 52.3 (NC)
June 20 23rd St. E. ND 97.7 (33.8–100) ND 57.6 (NC)
Silverwood Dog Park ND 58.6 (45.0–71.2)
July 25 SCB E 28.5 (16.3–54.9) 44.8 (28.2–72.3)
MacPherson Ave ND 76.4 (56.1–88.6) ND ND
14th St. E. 79.2 (59.5–98.7) 52.0 (NC)
23rd St. E. ND 90.7 (26.0–100) ND 71.3 (NC)
Silverwood Dog Park 109(98.3–127) 35.3 (23.6–44.0) ND 52.7 (NC)
August 22 SCB W ND 85.9 (60.8–96.2) ND ND (33.92–NC)
MacPherson Ave 95.0 (68.7–180) 16.6 (8.1–30.5) 62.0 (28.5–ND) 60.7 (42.5–NC)
14th St. E. ND ND 49.6 (15.6–ND) 60.8 (18.9–ND)
17th St. W. ND 24.4 (13.1–37.3) 88.2 (69.0–143) 53.9 (NC–59.6)
23rd St. E. ND ND ND 29.6 (19.9–45.3)
Silverwood Dog Park ND ND ND 52.8 (NC)
  1. Results are presented as percent of total sample concentration required to read the endpoint. IC50 and IC10 values were generated using GraphPad Prism as a dose–response curve (see “Methods” section) of, in the case of R. subcapitata, the initial (t = 0) fluorescence observed after 72 h, and in the case of V. fischeri, normalized luminescence as a percent of the negative control
  2. ND no observable toxicity detected at the respective threshold; NC not calculated; sample not tested