Effects of Acute and Chronic Heavy Metal (Cu, Cd, and Zn) Exposure on Sea Cucumbers (Apostichopus japonicus)

Table 5

The regression equation and medium lethal concentration (LC50) of Apostichopus japonicus exposed to various Zn, Cu, and Cd concentrations calculated by probit analysis.

Cation	Time/h	Regression equation		LC50 (mg L^−1)	MATC (mg L^−1)
Zn	24 h		0.9970	7.691
	48 h		0.9968	5.200
	72 h		0.9873	3.467
	96 h		0.9723	2.679	0.135
Cu	24 h		0.9924	0.468
	48 h		0.9884	0.267
	72 h		0.9943	0.153
	96 h		0.9985	0.133	0.007
Cd	24 h		0.9866	4.446
	48 h		0.9280	3.206
	72 h		0.9978	2.250
	96 h		0.9837	1.574	0.079

MATC (maximum allowable toxicant concentration).