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. 2016 May 25;23(17):17255–17268. doi: 10.1007/s11356-016-6678-1

Table 4.

Contamination degree and potential ecological risk index of sediments

	Zn	Cd	Pb	Ni	Cu	Cr	Hg
Parameters	C ⁱ _f ^a							∑ C ⁱ _f = C _d ^c
Mean	9.16	7.44	6.76	4.09	43.1	5.37	2.13	77.9
Median	3.17	1.97	4.82	1.56	10.5	1.06	0.66	26.3
Minimum	1.66	0.21	3.57	0.66	5.58	0.49	0.14	14.2
Maximum	37	31	14	14	251	22	11	358
Parameters	E ⁱ _r ^b							PERI
Mean	3.20	75.2	11.42	6.91	72.8	4.32	28.7	227
Median	1.11	19.9	8.15	2.63	17.8	0.85	8.86	91.6
Minimum	0.58	2.08	6.03	1.11	9.43	0.39	1.83	27.3
Maximum	13.1	316	23.1	23.2	424	18.1	145	950

^aContamination factor

^bPotential of ecological risk index for individual element

^cContamination degree