Investigation and Evaluation on Environmental Quality of Heavy Metals in Sediments of the Inland Bay of Shantou City, Guangdong Province

doi:10.19657/j.geoscience.1000-8527.2021.047

Abstract

Abstract:

The environmental quality of sediments in inland bay is closely related to the survival of aquatic organisms and human health. Forty-six samples are collected from surface and deep sediments in 23 locations of cross-gulf in the Inland Bay of Shantou City in Guangdong Province. The pH values, the concentration of 7 heavy metal elements, Cd, Hg, As, Pb, Cr, Cu and Zn, and the content of K are analyzed to evaluate the environmental risk of heavy metals in these sediments with reference to soil contamination risk of paddy field in agricultural land. The results show that the pH of sediments in Shantou Inland Bay is between 7.00 and 8.82, with an average value of 7.83. Among 46 samples, 41 samples have pH values greater than 7.5. The contents of 7 heavy metals in the sediments of Inland Bay are obviously lower than their environmental pollution control values, which means there is no need to control the environmental pollution of heavy metals in the sediments. The contents of Cd, As, Pb and Cr are all lower than their screening values of pollution risk, and their pollution risk could be ignored. The concentrations of Hg in 2 surface samples were higher than the screening value of pollution risk, and the contents of Cu and Zn in 18 samples were higher than their screening values of pollution risk. Therefore, it is suggested to monitor the concentrations of Cu, Zn and Hg in these sediments. The content of K is between 0.70% and 2.59%, with an average value of 1.54%. Based on the comparison of elemental contents between surface layer and deep layer sediments it is concluded that the pollution source of Hg in this area should be anthropogenic. However, the pollution sources of Cu and Zn may be anthropogenic or mixed resulted from anthropogenic and natural resources.

Key words: inland bay, sediment, heavy metals, environmental assessment, source analysis

CLC Number:

P595
X55

LI Jinzhe, LIU Ningqiang, GONG Qingjie, LI Chengzhu. Investigation and Evaluation on Environmental Quality of Heavy Metals in Sediments of the Inland Bay of Shantou City, Guangdong Province[J]. Geoscience, 2021, 35(05): 1441-1449.

Figures/Tables 5

References 32

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样号	表层									深层
样号	Cd	Hg	As	Pb	Cr	Cu	Zn	K	pH	Cd	Hg	As	Pb	Cr	Cu	Zn	K	pH
1	0.48	0.350	11.80	88.2	116.0	124.0	328	1.35	8.60	0.47	0.360	15.30	97.5	94.8	150.0	267	1.35	8.38
2	0.38	0.260	14.30	86.0	53.2	43.7	167	1.10	8.37	0.35	0.250	11.70	70.4	70.9	48.1	206	1.41	7.38
3	0.52	0.410	14.10	71.5	85.3	77.0	295	1.27	8.41	0.42	0.220	10.70	69.5	81.4	63.7	260	1.29	8.74
4	0.54	0.220	12.00	77.2	110.0	158.0	256	1.57	7.66	0.59	0.410	13.00	90.6	122.0	193.0	279	1.50	7.22
5	0.45	0.180	11.20	79.9	94.9	149.0	194	1.24	7.92	0.61	0.140	12.60	84.7	90.8	163.0	202	1.50	7.58
6	0.39	0.150	12.60	84.3	109.0	176.0	245	1.43	7.85	0.13	0.134	11.20	67.3	61.5	39.4	107	1.11	7.43
7	0.28	0.310	8.76	50.1	53.8	34.2	210	1.43	7.88	0.47	0.200	12.50	65.6	63.5	58.8	315	1.57	7.53
8	0.39	0.230	7.41	54.0	54.9	36.5	159	1.32	7.61	0.34	0.260	14.60	80.6	64.0	54.2	221	1.45	7.00
9	0.39	0.250	13.20	72.5	57.6	47.8	230	1.56	7.55	0.29	0.290	18.00	82.2	68.7	43.7	298	1.42	8.59
10	0.48	0.240	18.10	69.3	73.2	59.1	275	1.37	8.82	0.15	0.188	10.30	61.6	45.8	21.0	219	1.36	7.94
11	0.41	0.161	11.10	61.5	79.3	46.1	219	1.37	8.01	0.32	0.200	11.20	65.8	99.0	65.9	258	1.30	8.35
12	0.18	0.115	10.10	63.8	82.8	76.0	860	1.46	7.65	0.24	0.121	11.30	70.5	92.9	97.1	199	2.59	7.69
13	0.37	0.370	9.39	68.9	103.0	143.0	462	1.41	7.63	0.38	0.182	10.60	81.7	104.0	189.0	380	2.39	7.36
14	0.47	1.680	11.00	80.8	102.0	304.0	1 040	1.84	7.66	0.35	0.380	10.90	72.9	103.0	192.0	727	2.00	7.72
15	0.39	1.300	8.65	61.5	80.2	156.0	209	2.17	7.78	0.04	0.039	3.82	36.7	32.5	40.4	39	2.02	7.51
16	0.23	0.189	5.87	47.8	49.3	55.7	203	0.70	7.89	0.07	0.100	5.21	35.3	33.8	21.8	98	0.99	7.90
17	0.30	0.260	10.90	80.0	84.7	96.6	546	1.20	8.05	0.25	0.156	9.22	68.4	92.7	130.0	537	2.19	7.85
18	0.31	0.290	8.18	60.2	86.3	155.0	406	2.18	7.82	0.18	0.120	13.30	81.4	73.9	82.6	629	2.29	7.56
19	0.30	0.144	8.50	60.2	73.7	140.0	217	2.16	7.74	0.34	0.158	9.86	69.3	74.2	125.0	509	0.89	7.86
20	0.18	0.095	5.97	59.6	59.9	98.1	168	1.16	7.86	0.14	0.220	9.65	70.6	64.9	44.7	321	1.75	7.72
21	0.19	0.122	9.59	72.7	76.7	122.0	471	1.97	7.52	0.24	0.136	10.10	68.7	66.3	154.0	329	1.58	7.85
22	0.13	0.090	6.99	59.5	45.0	69.7	175	1.29	7.81	0.13	0.090	8.60	63.7	51.3	40.7	65	1.27	7.66
23	0.14	0.096	7.30	58.1	51.4	58.0	317	1.60	7.77	0.09	0.076	5.82	51.2	45.6	27.1	350	1.38	7.68
最小值	0.13	0.090	5.87	47.8	45.0	34.2	159	0.70	7.52	0.04	0.039	3.82	35.3	32.5	21.0	39	0.89	7.00
最大值	0.54	1.680	18.10	88.2	116.0	304.0	1 040	2.18	8.82	0.61	0.410	18.00	97.5	122.0	193.0	727	2.59	8.74
平均值	0.34	0.330	10.30	68.2	77.5	105.0	333	1.48	7.91	0.29	0.192	10.80	69.8	73.8	88.9	296	1.59	7.76

样号	表层									深层
样号	Cd	Hg	As	Pb	Cr	Cu	Zn	K	pH	Cd	Hg	As	Pb	Cr	Cu	Zn	K	pH
1	0.48	0.350	11.80	88.2	116.0	124.0	328	1.35	8.60	0.47	0.360	15.30	97.5	94.8	150.0	267	1.35	8.38
2	0.38	0.260	14.30	86.0	53.2	43.7	167	1.10	8.37	0.35	0.250	11.70	70.4	70.9	48.1	206	1.41	7.38
3	0.52	0.410	14.10	71.5	85.3	77.0	295	1.27	8.41	0.42	0.220	10.70	69.5	81.4	63.7	260	1.29	8.74
4	0.54	0.220	12.00	77.2	110.0	158.0	256	1.57	7.66	0.59	0.410	13.00	90.6	122.0	193.0	279	1.50	7.22
5	0.45	0.180	11.20	79.9	94.9	149.0	194	1.24	7.92	0.61	0.140	12.60	84.7	90.8	163.0	202	1.50	7.58
6	0.39	0.150	12.60	84.3	109.0	176.0	245	1.43	7.85	0.13	0.134	11.20	67.3	61.5	39.4	107	1.11	7.43
7	0.28	0.310	8.76	50.1	53.8	34.2	210	1.43	7.88	0.47	0.200	12.50	65.6	63.5	58.8	315	1.57	7.53
8	0.39	0.230	7.41	54.0	54.9	36.5	159	1.32	7.61	0.34	0.260	14.60	80.6	64.0	54.2	221	1.45	7.00
9	0.39	0.250	13.20	72.5	57.6	47.8	230	1.56	7.55	0.29	0.290	18.00	82.2	68.7	43.7	298	1.42	8.59
10	0.48	0.240	18.10	69.3	73.2	59.1	275	1.37	8.82	0.15	0.188	10.30	61.6	45.8	21.0	219	1.36	7.94
11	0.41	0.161	11.10	61.5	79.3	46.1	219	1.37	8.01	0.32	0.200	11.20	65.8	99.0	65.9	258	1.30	8.35
12	0.18	0.115	10.10	63.8	82.8	76.0	860	1.46	7.65	0.24	0.121	11.30	70.5	92.9	97.1	199	2.59	7.69
13	0.37	0.370	9.39	68.9	103.0	143.0	462	1.41	7.63	0.38	0.182	10.60	81.7	104.0	189.0	380	2.39	7.36
14	0.47	1.680	11.00	80.8	102.0	304.0	1 040	1.84	7.66	0.35	0.380	10.90	72.9	103.0	192.0	727	2.00	7.72
15	0.39	1.300	8.65	61.5	80.2	156.0	209	2.17	7.78	0.04	0.039	3.82	36.7	32.5	40.4	39	2.02	7.51
16	0.23	0.189	5.87	47.8	49.3	55.7	203	0.70	7.89	0.07	0.100	5.21	35.3	33.8	21.8	98	0.99	7.90
17	0.30	0.260	10.90	80.0	84.7	96.6	546	1.20	8.05	0.25	0.156	9.22	68.4	92.7	130.0	537	2.19	7.85
18	0.31	0.290	8.18	60.2	86.3	155.0	406	2.18	7.82	0.18	0.120	13.30	81.4	73.9	82.6	629	2.29	7.56
19	0.30	0.144	8.50	60.2	73.7	140.0	217	2.16	7.74	0.34	0.158	9.86	69.3	74.2	125.0	509	0.89	7.86
20	0.18	0.095	5.97	59.6	59.9	98.1	168	1.16	7.86	0.14	0.220	9.65	70.6	64.9	44.7	321	1.75	7.72
21	0.19	0.122	9.59	72.7	76.7	122.0	471	1.97	7.52	0.24	0.136	10.10	68.7	66.3	154.0	329	1.58	7.85
22	0.13	0.090	6.99	59.5	45.0	69.7	175	1.29	7.81	0.13	0.090	8.60	63.7	51.3	40.7	65	1.27	7.66
23	0.14	0.096	7.30	58.1	51.4	58.0	317	1.60	7.77	0.09	0.076	5.82	51.2	45.6	27.1	350	1.38	7.68
最小值	0.13	0.090	5.87	47.8	45.0	34.2	159	0.70	7.52	0.04	0.039	3.82	35.3	32.5	21.0	39	0.89	7.00
最大值	0.54	1.680	18.10	88.2	116.0	304.0	1 040	2.18	8.82	0.61	0.410	18.00	97.5	122.0	193.0	727	2.59	8.74
平均值	0.34	0.330	10.30	68.2	77.5	105.0	333	1.48	7.91	0.29	0.192	10.80	69.8	73.8	88.9	296	1.59	7.76

分类项	Cd	Hg	As	Pb	Cr	Cu	Zn
pH≥7.5时筛选值	0.8	1.0	20	240	350	100	300
pH≥7.5时管制值	4.0	6.0	100	1 000	1 300	500^*	1 500^*
pH=6.5~7.5时筛选值	0.6	0.6	25	140	300	100	250
pH=6.5~7.5时管制值	3.0	4.0	120	700	1 000	500^*	1 250^*

分类项	Cd	Hg	As	Pb	Cr	Cu	Zn
pH≥7.5时筛选值	0.8	1.0	20	240	350	100	300
pH≥7.5时管制值	4.0	6.0	100	1 000	1 300	500^*	1 500^*
pH=6.5~7.5时筛选值	0.6	0.6	25	140	300	100	250
pH=6.5~7.5时管制值	3.0	4.0	120	700	1 000	500^*	1 250^*