高位虾池底质重金属富集特性及污染、生态风险评价

doi:10.13284/j.cnki.rddl.003302

Abstract

Abstract:

To study the environmental impact caused by higher-place shrimp pond aquaculture, Inductively Coupled Plasma Mass Spectrometer (ICP-MS, Agilent 7700x) was used to detect the contents of Cr, Ni, Cu, Zn, As, Cd, and Pb in the sediments of three types of shrimp ponds (the bottom of the shrimp ponds was covered with sand, cement, and mulch, respectively) and their surrounding ditches in Dongying Town, Haikou City. The Vario TOC analyzer was used to detect the Total Nitrogen (TN) and Total Organic Carbon (TOC) contents in the sediments. The detected values were analyzed and evaluated using various parameters, such as the single factor pollution index, geo-accumulation index, and comprehensive potential ecological risk index, to reveal the spatial enrichment, pollution status, and ecological risk of heavy metal contents in the sediments of higher-place shrimp ponds and their surrounding ditches. The major results of this study were as follows: 1) The contents of heavy metals in the sediments of the unwashed shrimp pond increased significantly from the L1 layer to the L4 layer. 2) In the sediments of the surrounding ditches, the contents of all heavy metals (except for those of Ni and Cd, which were the highest in the L1 layer) were the highest in the L4 layer and were 1.29-15.51 times higher than those in the surface layer; 3) In the L1 layer of the sediment of the shrimp pond, Cd showed a significant accumulation (pollution); its content were 5.47-35.18 times higher than the soil background value in the Hainan Province . 4) The evaluation of I_geo indicated that there are two or more heavy metals in all types of sediments that reached a mild-medium pollution degree and above. The most serious pollutant in each sample pond was Cd, ranging from a level of 1.87 to 4.55; the highest level, 5, indicates strong-extremely severe pollution, while the lowest level, 2, indicates a medium pollution level. 5) The single-factor potential risk coefficient ( $E r i$ ) of all heavy metals, except Cd, in the surface layer sediments of each sample pond was ≤40, which indicates a slight pollution degree. 6) The Comprehensive Potential Ecological Risk Index (RI) of the sediments was 176.97 to 1090.87, and the RIs of all plots showed moderate or higher ecological risks, for which Cd was the main contributing factor. The Cd pollution load sharing rate (the proportion of Cd in RI) in the seven sample plots exceeded 90%, mainly because the biological toxicity response coefficient (T_i=30) of Cd was the highest and the reference value (=0.05) was the lowest; this increased the RI values and the ecological risk index levels. 7) Pearson's correlation analysis showed that the Cr, Ni, Cu, As, Cd, and TOC contents in the bait residues and prawn excreta of shrimp pond bottoms had extremely significant correlations with each other, and the correlation coefficient was as high as 0.9 or more, indicating that the bait used contained the above heavy metals at varying concentrations and that organic carbon is an important factor that affects the enrichment of heavy metals in the substrate.

Key words: higher-place shrimp ponds, sediment, heavy metal, pollution status, ecological risk

CLC Number:

Zi'ai Wang, Shaoxia Tang, Yuxuan Fu, Miao Zheng, Dan Wu, Keke Chen, Wenbo Dai. Evaluation of the Accumulation Characteristics, Pollution Status, and Ecological Risk of Heavy Metals in Sediments of Higher-Shrimp Ponds[J].Tropical Geography, 2021, 41(1): 136-146.

Figures/Tables 9

Table 1

Fig.1

Table 2

Classification of Igeo and potential ecological risk indexes"

地积累指数			潜在生态风险指数
I_geo	分级	污染程度	单因子潜在生态风险系数		综合潜在生态风险指数
I_geo	分级	污染程度	$E r i$	污染程度	RI	综合污染程度
I_geo≤0	0	无	$E r i$ ≤40	轻微	RI≤150	轻微
0＜I_geo≤1	1	轻度—中等	40≤ $E r i$ ＜80	中等	150≤RI＜300	中等
1＜I_geo≤2	2	中等	80≤ $E r i$ ＜160	较强	300≤RI＜600	强
2＜I_geo≤3	3	中等—强	160≤ $E r i$ ＜320	强	RI≥600	极强
3＜I_geo≤4	4	强	$E r i$ ≥320	极强
4＜I_geo≤5	5	强—极严重
5＜I_geo≤10	6	极严重

Table 2

Table 3

Fig.2

Table 4

Fig.3

Fig.4

Table 5

References 0

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采样类型	样地编号	采样深度/cm	虾池清洁状况	池底铺设材料
虾池底质	S1	0~20	已清洗未注水	铺设沙土
	S2	0~20	已清洗未注水	铺设水泥
	S3	0~20	已清洗未注水	铺设沙土
	S4	0~20	刚排水未清洗	铺设沙土
	S5、S6	0~5	刚排水未清洗	铺设地膜
虾池围堤外侧	S7	0~20	—	—

样地	Cr	Ni	Cu	Zn	As	Cd	Pb
S1	40.08±31.27	20.21±15.41	1.25±0.64	7.59±4.2	0.94±0.95	0.58±0.19	1.5±0.77
S2	24.59±17.49	6.35±4.07	2.72±0.96	12.34±2.38	2.13±1.57	0.86±0.2	4.07±1.51
S3	39.03±39.95	5.08±3.29	0.84±0.29	33.56±36.76	0.49±0.13	0.59±0.11	0.62±0.18
S4	55.58±43.05	4.68±2.22	0.62±0.29	9.16±0.87	0.43±0.03	0.27±0.01	1.43±0.01
S5	17.09±1.04	7.61±0.42	1.5±0.14	199.98±127.09	0.78±0.02	0.82±0.08	1.86±0.5
S6	21.33±0.13	2.62±0.61	2.17±0.07	47.06±3.49	3.57±0.33	1.76±0.03	2.54±0.16
S7	14.38±0.88	15.11±3.18	0.8±0.26	13.22±5.81	0.93±0.48	0.48±0.24	2.74±0.12

元素	Cr	Ni	Cu	Zn	As	Cd	Pb	TOC	TN	元素	Cr	Ni	Cu	Zn	As	Cd	Pb	TOC	TN
S5、S6样地										S1、S3样地
Cr	1									Cr	1
Ni	-0.927^**	1								Ni	-0.310	1
Cu	0.996^**	-0.947^**	1							Cu	0.574	0.423	1
Zn	-0.882^*	0.648	-0.858^*	1						Zn	-0.403	-0.113	-0.396	1
As	0.960^**	-0.995^**	0.975^**	-0.722	1					As	-0.368	-0.173	-0.589	-0.238	1
Cd	0.985^**	-0.976^**	0.989^**	-0.788	0.991^**	1				Cd	0.701	-0.029	0.471	-0.236	-0.594	1
Pb	0.556	-0.826^*	0.602	-0.107	0.765	0.688	1			Pb	0.407	0.380	0.831^*	-0.206	-0.457	0.460	1
TOC	0.953^**	-0.991^**	0.961^**	-0.698	0.992^**	0.991^**	0.772	1		TOC	0.123	-0.477	-0.235	0.194	-0.303	0.311	-0.521	1
TN	-0.792	-0.779	-0.823^*	0.698	-0.804	-0.780	-0.518	-0.746	1	TN	0.024	-0.448	-0.238	0.593	-0.236	0.124	0.366	0.789^*	1
S2样地										S4样地
Cr	1									Cr	1
Ni	-0.813^*	1								Ni	-0.984^**	1
Cu	0.761	-0.472	1							Cu	0.967^**	-0.995^**	1
Zn	0.614	-0.219	0.934^**	1						Zn	-0.487	0.430	-0.345	1
As	-0.895^*	0.844^*	-0.631	-0.517	1					As	0.636	-0.582	0.604	0.222	1
Cd	0.306	0.130	0.627	0.643	0.085	1				Cd	0.209	-0.190	0.247	0.677	0.866^*	1
Pb	0.965^**	-0.822^*	0.659	0.535	-0.855^*	0.262	1			Pb	-0.046	-0.026	0.118	0.891^*	0.536	0.843^*	1
TOC	-0.394	0.287	-0.132	-0.202	0.680	0.459	-0.327	1		TOC	0.920^**	-0.962^**	0.984^**	-0.169	0.671	0.385	0.295	1
TN	-0.862^*	0.925^**	-0.441	-0.277	0.953^**	0.211	-0.869^*	0.598	1	TN	0.648	0.619	-0.548	0.969^**	0.111	0.589	0.762	-0.389	1

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Evaluation of the Accumulation Characteristics, Pollution Status, and Ecological Risk of Heavy Metals in Sediments of Higher-Shrimp Ponds

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