Environmental and Ecological Risk Assessment of Trace Metal Contamination in Mangrove Ecosystems: A Case from Zhangjiangkou Mangrove National Nature Reserve, China

Table 5

Geoaccumulation index () values of trace metals in sediments from Zhangjiangkou Mangrove National Nature Reserve.

Station	Cu	Cd	Pb	Cr	Zn	As	Hg
C01	−0.94	−1.74	0.62	−1.95	−0.49	1.15	−2.58
C02	−1.08	−1.91	0.82	0.29	−0.27	1.02	−2.58
C03	−1.16	−1.74	1.00	−1.33	−0.29	1.04	−2.00
C04	−1.05	−2.58	0.82	−1.24	−0.39	1.07	−3.58
C05	−1.07	−2.91	1.07	−1.02	−0.35	1.09	−1.58
C06	−1.29	−2.58	0.62	−2.27	−0.66	0.96	/
C07	−1.13	−2.32	0.61	−1.72	−0.51	1.00	−2.58
C08	−1.10	−2.58	0.78	−1.44	−0.45	1.25	−2.58
C09	−1.17	−2.58	0.72	−1.64	−0.40	0.90	−3.58
C10	−0.97	−2.32	1.00	−1.94	−0.43	0.97	−3.58
C11	−1.01	−2.91	0.72	−1.99	−0.48	1.10	/
C12	−0.96	−2.58	0.81	−2.20	−0.55	0.95	−2.58
C13	−1.49	−2.91	0.96	−2.22	−0.44	1.20	/
C14	−1.09	−2.58	0.69	−1.78	−0.58	1.05	−2.00
C15	−1.19	−0.74	0.78	−2.06	−0.51	1.13	−0.58
C16	−1.19	−2.32	0.82	−2.00	−0.34	0.96	−3.58
C17	−0.84	−2.91	0.75	−1.63	−0.34	1.14	−3.58
DS01	−1.14	−1.74	0.95	−1.94	−0.38	1.18	−2.58
DS02	−0.85	−1.45	1.32	−2.88	−0.43	1.14	−0.78
DS03	−1.29	−2.32	1.20	−2.44	−0.67	1.30	−2.58
DS04	−2.15	−1.45	0.77	−1.84	−0.48	0.40	−3.58
DS05	−1.53	−1.91	0.62	−2.68	−0.62	0.74	−3.58
DS06	−1.40	−3.32	0.77	−2.52	−0.61	0.93	−1.58
DS07	−1.17	−0.66	0.87	−3.46	−0.45	1.42	−3.58
DS08	−1.38	−3.32	1.23	−2.00	−0.51	1.04	−1.26
DS09	−1.27	−2.10	0.92	−3.03	−0.64	1.28	−2.58
DS10	−1.41	−2.91	0.76	−3.03	−0.43	1.12	−2.58
DS11	−1.27	−2.91	1.02	−3.05	−0.51	1.23	−2.00
DS12	−1.16	−2.32	1.01	−1.71	−0.50	1.25	−3.58
Mean	−1.20	−2.30	0.86	−2.03	−0.47	1.07	−2.49

class: 0: none, 1: none to medium, 2: moderate, 3: moderate to strong, 4: strongly polluted, 5: strong to very strong, and 6: very strong.
“/”: no data.