Risk Assessment and Prediction of Heavy Metal Pollution in Groundwater and River Sediment: A Case Study of a Typical Agricultural Irrigation Area in Northeast China

Table 7

Assessment of heavy metal potential ecological risks in sediment.

Number	Thickness (cm)					RI
		Cr	As	Cd	Pb
N10-1	0–26	1.18	1.50	2.20	1.78	6.67
N10-2	26–40	1.56	2.34	7.10	2.18	13.19
N11-1	0–25	2.85	4.77	15.25	5.35	28.23
N11-2	25–45	2.46	3.70	12.11	4.26	22.54
N11-3	45–50	1.51	2.61	7.08	3.06	14.27
N12-1	0–50	3.68	3.14	18.59	11.14	36.55
N12-2	Surface layer	2.20	3.58	9.58	3.69	19.05
N13-1-1	0–5	2.25	3.29	10.71	4.78	21.02
N13-1-2	5–30	0.55	0.98	1.41	1.59	4.53
N13-2-1	0–15	1.72	2.83	11.72	3.13	19.40
N13-2-2	15–40	2.78	5.07	10.96	4.32	23.14
N13-2-3	40–64	2.78	4.08	17.55	4.35	28.75
N14-1	0–23	1.77	3.35	11.99	2.79	19.90
N14-2	23–30	1.93	4.09	10.78	3.42	20.22
N14-3	30–40	2.64	5.57	16.70	5.81	30.72
N14-4	40–50	1.00	2.30	6.79	2.10	12.19
N16-1	0–26	1.51	2.43	8.12	2.85	14.92
N16-2	26–50	1.46	2.61	5.31	2.99	12.36
N17	0–32	1.45	1.25	3.34	2.15	8.19
N18	0–28	2.84	2.57	10.55	6.47	22.43
N19-1	0–5	2.20	1.86	17.09	2.77	23.93
N19-2	5–25	3.54	4.36	16.85	8.78	33.53
N20-1	0–29	2.91	2.60	20.02	6.04	31.57
N21-1	0–5	2.43	2.94	11.94	8.36	25.67
N21-2	5–26	4.95	8.56	38.51	20.37	72.39
N24-1	Surface layer	0.89	1.54	4.05	2.24	8.72
S14-1	Surface layer	1.85	3.13	9.16	3.49	17.63
S16-1	Surface layer	0.43	0.78	1.63	1.35	4.19
S19-1	0–44	2.15	7.74	11.51	5.08	26.49
S19-2	0–44	2.09	8.14	12.62	3.98	26.84
S20-1	0–13	3.76	4.64	22.97	10.20	41.57
S20-2	13–22	1.84	2.80	6.25	3.75	14.65