Ranking Ecological Risk of Metals to Freshwater Organisms in Lake Taihu, China

Table 3

Exposure and risk results of metals in Lake Taihu.

Metal	Exposure concentration (μg/L)	HC5 (μg/L)	Quotient method (RQ)	Probability method (risk)
As	2.42	9.43	0.26	0.021
Cd	0.76	0.77	0.99	0.066
Cr	2.21	0.57	3.88	0.039
Cu	3.47	1.27	2.73	0.101
Pb	5.23	1.1	4.75	0.047
Mn	27.47	97.65	0.28	0.02
Hg	0.01	0.07	0.14	0.017
Ni	10	3.71	2.7	0.09
Zn	15.28	15.16	1.01	0.068