土壤有机质组分中多环芳烃分配特征和生态风险

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Abstract

Soil organic matter is one of the most important factors that affects the environmental behavior of polycyclic aromatic hydrocarbons (PAHs), and there are differences in the bioavailability and environmental risks of PAHs among different soil organic matter fractions. The contents and compositions of 15priority PAHs and their distribution patterns in the light (LF) and heavy fractions (HF) of six field-contaminated soils were studied. The toxicity equivalent concentration of benzo[a]pyrene (TEQ_BaP) was adopted to assess the ecological risks of PAHs in the bulk soil, as well as in the LF and HF. The results showed that the contents of the fifteen PAHs in the six soils ranged from 8.31×10² to 2.97×10⁴ μg/kg, and the 4-ring PAHs accounted for the highest proportion, which ranged from 35.7% to 59.6%. In the six soils, the contents of total PAHs were in the ranges of 2.38×10⁴~1.17×10⁵μg/kg for the LF and of 3.7⁵×10²~2.12×10⁴μg/kg for the HF. Although the LF accounted for only 1.0%~9.8% of the total soil mass, it accounted for 5.9%~60.6% of total soil PAHs. TEQ_BaP of the total fifteen PAHs in the LF ranged from 2.99×10² to 1.68×10⁴μg/kg, which was 2.7~33.2 times of those in the bulk soil and 3.6~69.5times of those in the HF, respectively. For the remediation and risk assessment of PAHs in contaminated soils, PAHs in the LF must be emphasized. In contaminated soils where the proportions of PAHs bound with the LF are high, removing the LF from the bulk soil would be an alternative remediation method.

Key words： polycyclic aromatic hydrocarbon light fraction heavy fraction distribution pattern ecological risk

Received: 10 October 2019

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X53

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	Articles by authors
	LIU Wen-jing
	LI Guang-po
	NI Jin-zhi
	CHEN Wei-feng
	YANG Liu-ming
	WEI Ran

Cite this article:

LIU Wen-jing,LI Guang-po,NI Jin-zhi等. Distribution patterns and ecological risks of polycyclic aromatic hydrocarbons in different soil organic matter fractions[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1620-1627.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I4/1620

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