Cytotoxicity, Genotoxicity, and Phytotoxicity of Tannery Effluent Discharged into Palar River Basin, Tamil Nadu, India

Table 3

Effect of tannery effluent on root growth in Allium cepa (all values are mean ± SD range for three observations each). The EC₅₀ was found to be 7.79%.

Concentration of tannery effluent (%)	Root length (cm)	Root growth (%)
0	5.5 ± 0.33	100
5	2.9 ± 0.27	52.7
10	2.6 ± 0.21	47.2
15	2.4 ± 0.29	43.6
20	2.1 ± 0.27	38.1
25	1.5 ± 0.21	27.2
30	0.9 ± 0.28	16.3
35	0.5 ± 0.31	9.1
40	0.2 ± 0.27	3.6
45	0	0
50	0	0
55	0	0