Table 5.

Potential ecological risk assessment results of heavy metals in sewage sludge for land use.

Station	$E_r^i$							RI
	Pb	Cu	Zn	Ni	Cr	As	Cd
1	1.40	23.99	5.97	3.09	6.14	13.05	256.62	310.27
2	0.89	25.14	6.01	14.19	6.11	11.00	194.41	257.76
3	4.34	16.89	8.83	5.43	11.28	10.79	203.82	261.40
4	1.11	18.40	6.87	5.02	3.16	12.24	203.90	250.69
5	2.21	2.16	1.55	1.38	1.07	7.26	153.31	168.94
6	11.20	14.43	3.20	4.86	2.76	9.16	79.41	125.02
7	1.02	2.61	0.09	0.12	0.05	26.26	131.76	161.93
8	4.85	38.70	8.36	11.04	8.65	9.73	239.71	321.03
9	8.46	55.24	6.08	6.46	8.85	14.81	244.71	344.61
Mean	3.94	21.95	5.22	5.73	5.34	12.70	189.74	244.63
SD	3.70	16.82	2.99	4.46	3.83	5.55	58.39	77.06