沟塘水质及其周边浅层地下水PAHs的风险评价

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Abstract To explore the impact of ditch pond water on nearby shallow groundwater in rural resident areas, typical ditches and ponds were selected in a county of Henan province. Samples of ditch pond water and shallow groundwater were collected in both dry season and wet season respectively. The contents of 16kinds of polycyclic aromatic hydrocarbons (PAHs) were detected by high performance liquid chromatography. The pollution characteristics, ecological and health risks of PAHs in both water seasons were described and compared. The results showed that the contents of BaP, ∑PAHs, TEQ (BaP) and carcinogenic PAHs of ditch pond water in dry water season were 0.911ng/L, 29.3ng/L, 1.64ng/L and 28.1%, which were lower than those in wet water season. They were 5.37ng/L, 291ng/L, 12.5ng/L and 25.9% in the shallow groundwater, respectively, which was higher than those in the wet water season. The sources of PAHs in ditch pond water and shallow groundwater mainly come from the combustion of Biomass and the coal. The contents of PAHs in shallow groundwater were correlated with the water in ditch ponds. It was showed that the content of PAHs in the groundwater samples decreased with the increasing of the distance to the ditch ponds. The correlation coefficient in the dry water season was lower than that in the wet water season. In the dry water season, the cumulative non-carcinogenic risk (HQ) of PAHs through shallow drinking groundwater was 2.21×10^-3 and the cumulative carcinogenic risk (R) for adults was 1.56×10^-6, for 72.0% of Adults R > 1x10^-6.The contribution of BaA, BbF and InP to adult carcinogenic risk was 72.1%, 9.10% and 4.80%, respectively. There was low ecological risk for the total PAHs of ditch pond water in dry water season, while there was medium risk in wet water season. The ecological risk was various in different ditch ponds. The PAHs of C5 in the wet water season suffered high ecological risk level with the greatest contribution of BaA (40.7%). The PAHs in A2 in dry water season and C3 in wet water season showed the medium risk level 2. All those suggested that there was correlation for the PAHs in ditch pond water and in the surrounding shallow groundwater. There was low ecological risk for total PAHs in dry season. The carcinogenic risk through shallow drinking groundwater was higher than 1×10^-6 for 72.0% adults.

Key words： dry and wet water season ditch pond water shallow groundwater polycyclic aromatic hydrocarbons risk assessment

Received: 24 December 2020

PACS:	X52
	X703.5

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	Articles by authors
	ZHANG Han
	CHENG Yu
	Lü Zhan-lu
	CHEN Xin-yue
	ZOU Tian-sen
	GUO Ling-chuan
	ZHANG Jin-liang

Cite this article:

ZHANG Han,CHENG Yu,Lü Zhan-lu等. Risk Assessment of PAHs in ditch pond water and its surrounding shallow groundwater[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3808-3815.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I8/3808

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