溶解性腐殖酸与多环芳烃相互作用机理

生态学杂志

溶解性腐殖酸与多环芳烃相互作用机理

丁海涛^1,2,赵青²,宋薇²,张雪娇²,张思玉²,李海波^1*

（¹东北大学资源与土木工程学院，环境工程实验室，沈阳 110819；²中国科学院污染生态与环境工程重点实验室，中国科学院沈阳应用生态研究所，沈阳 110016）

出版日期:2020-07-10 发布日期:2021-01-09

Mechanism underlying the interaction between dissolved humic acid and polycyclic aromatic hydrocarbons.

DING Hai-tao^1,2, ZHAO Qing², SONG Wei², ZHANG Xue-jiao², ZHANG Si-yu², LI Hai-bo^1*

(¹Laboratory of Environmental Engineering, College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China; ²Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Science, Shenyang 110016, China).

Online:2020-07-10 Published:2021-01-09

摘要/Abstract

摘要： 溶解性腐殖酸（DHA）广泛存在于自然界中，并影响多环芳烃的环境归趋。本研究以常见的多环芳烃污染物——芘为代表，利用多袋平衡透析系统，通过比较不同DHA与芘的分配系数，探究腐殖酸组成结构与其结合芘的能力之间的相关规律及机理。结果表明：HA主要是由芳香碳、脂肪碳以及含氧、含氮官能团组成；HA结合芘的能力（K_DOC为120.36～172.40 μg·g^-1 C）随着HA芳香度（SUVA254为2.51～4.18）和疏水组分含量（A260为1.21～2.04）升高而增强，随着其脂肪度（H/C为1.02～1.34）、极性官能团（（N+O）/C为0.48～0.69）升高而减弱，上述关系均十分显著。本研究揭示了DHA是以芳香碳为疏水内核、以脂肪链及分布在脂肪链上的极性官能团为亲水外壳的类胶束结构，研究结果可为多环芳烃的迁移转化及环境归趋评价提供一定的理论支持。

关键词: 生态威胁, 生态保护, 区域生态安全, 景观格局, 城镇化

Abstract: Dissolved humic acids (DHAs) are widely found in nature, which affect the environmental fate of polycyclic aromatic hydrocarbons. Focusing on pyrene, one of the common polycyclic aromatic hydrocarbon pollutants, we used a multi-bag equilibrium system to compare the partition coefficients of different DHAs with pyrene to explore the relationship between the composition of humic acid (HA) and its ability to bind pyrene and the underlying mechanisms. The results showed that HA is mainly composed of aromatic carbon, aliphatic carbon, and oxygen-containing and nitrogen-containing functional groups. The ability of HA to bind pyrene (K_DOC is 120.36-172.40 μg·g^-1 C) increased with the increases of HA aromatic (SUVA254 is 2.51-4.18) and hydrophobic component content (A260 is 1.21-2.04), and decreased with the increases of its aliphatic (H/C is 1.02-1.34) and polar functional group \[(N+O)/C is 0.48-0.69\]. Our results suggest that DHA is a micelle-like structure with aromatic carbon as a hydrophobic core, and the aliphatic chain and the polar functional group distributed on the aliphatic chain being hydrophilic. Our results provide theoretical support for assessing ecological risk of polycyclic aromatic hydrocarbons.

Key words: urbanization, ecological stress, ecological protection., landscape pattern, regional ecological security

丁海涛,赵青,宋薇,张雪娇,张思玉,李海波. 溶解性腐殖酸与多环芳烃相互作用机理[J]. 生态学杂志.

DING Hai-tao, ZHAO Qing, SONG Wei, ZHANG Xue-jiao, ZHANG Si-yu, LI Hai-bo. Mechanism underlying the interaction between dissolved humic acid and polycyclic aromatic hydrocarbons.[J]. cje.

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