Toxicity of Metals to a Freshwater Ostracod: Stenocypris major

Table 2

Median lethal concentrations (LC₅₀) for S. major at different exposure times for Cu, Cd, Zn, Pb, Ni, Fe, Al, and Mn.

(a)

Time (hour)	LC50 (μg/L)  for Cu	95% Confidence limits	LC50 (μg/L) for Cd	95% Confidence limits	LC50 (μg/L) for Zn	95% Confidence limits	LC50 (μg/L) for Pb	95% Confidence limits
24	82.17	39.02–141.5	125.18	77.69–180.97	2655.27	2148.19–3282.04	6582.57	4920.11–8806.77
48	38.84	19.3–55.82	50.73	21.7–78.3	1682.70	1365.77–2073.17	2885.86	7919.06–4339.71
72	30.67	10.07–42.46	28.76	0.49–47.82	1475.74	1204.16–1808.58	1491.11	991.86–2241.66
96	25.2	4.51–35.75	13.15	NA	1189.83	955.19–1482.13	526.19	307.06–901.72

(b)

Time (hour)	LC50 (μg/L) for Ni	95% Confidence limits	LC50 (𝜇g/L) for Fe	95% Confidence limits	LC50 (μg/L) for Al	95% Confidence limits	LC50 (μg/L) for Mn	95% Confidence limits
24	57280.92	49144.72–66764.11	911.44	654.2–1200.59	12530.33	10197.69–15396.55	3984.34	2341.04–16025.68
48	39177.81	33011.57–46495.85	644.39	450.21–770.2	6980.05	2360.23–20642.53	1733.27	1050.82–3095.45
72	35134.49	28902.18–42710.69	521.24	300.04–617.27	4964.23	3598.66–6848.01	636.03	278.65–943.71
96	19743.75	14774.15–26384.97	278.9	NA	3101.96	1281.61–7507.85	510.24	206.07–689.26

NA: not available: values could not be calculated from probit software.