Toxic Metals Enrichment in the Surficial Sediments of a Eutrophic Tropical Estuary (Cochin Backwaters, Southwest Coast of India)

Table 5

Number of samples that had metal concentrations above and below the sediment effects data of ERM and ERL in the Cochin Estuary. ERM and ERL guidelines were from [13].

Metal	Zn	Cd	Cu	Pb	Cr	Ni
ER-L (mg kg^−1)	15O	1.2	34	46.7	81	20.9
ER-M (mg kg^−1)	410	9.6	270	218	370	51.6
Between ERL and ERM (no. of stations in CE)	11	21	33	41	40	16
Above ERM (no. of stations in CE)	25	29	0	0	3	34
Below ERL (no. of stations in CE)	20	6	23	15	13	6