Contamination and Ecological Risk Assessment of Heavy Metals in Surface Sediments of Huangshui River, Northwest China

Table 3

The concentrations of heavy metals in the sediments of Huangshui River (mg·kg⁻¹).

Site	Cr		As		Pb		Cd		Zn
	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
S1	63.55	0.40	414.93	0.07	80.05	0.07	6.21	0.11	27.70	0.26
S2	44.18	0.45	151.23	0.14	42.75	0.23	5.74	0.03	6.95	0.07
S3	82.68	0.40	425.83	0.25	91.30	0.15	4.53	0.22	35.78	0.09
S4	77.35	0.42	464.20	0.23	29.10	0.09	4.39	0.13	86.18	0.08
S5	86.03	0.12	498.55	0.22	85.80	0.11	4.50	0.13	17.95	0.03
S6	139.85	0.22	499.38	0.41	89.20	0.14	4.36	0.11	34.23	0.08
S7	198.13	0.56	671.05	0.16	106.25	0.15	4.68	0.23	5.90	0.23
S9	190.90	0.29	788.35	0.54	115.60	0.51	4.71	0.33	5.13	0.11
S11	138.75	0.28	473.48	0.33	94.35	0.77	4.80	0.08	2.78	0.08
S12	200.20	0.22	818.55	0.32	116.00	0.08	4.82	0.12	3.50	0.11
S13	201.70	0.45	718.98	0.15	121.95	0.06	5.10	0.08	5.60	0.25
S14	186.25	0.35	532.78	0.14	88.95	0.38	5.09	0.06	3.00	0.11
S15	157.95	0.02	293.90	0.24	54.50	0.44	4.91	0.07	1.60	0.09
S16	161.25	0.21	362.58	0.28	57.00	0.22	5.15	0.04	1.45	0.10