王春蕾^1,2,
刘路^1,2,
马腾^1,2,,,
陈柳竹^1,2,
蔡鹤生^1,2
1. 中国地质大学(武汉) 环境学院, 武汉 430074;
2. 生物地质与环境地质国家重点实验室, 中国地质大学, 武汉 430074

作者简介: 王春蕾(1991-),女,硕士研究生,研究方向为微生物地球化学、环境同位素,E-mail:carolinell321@yeah.net.

通讯作者: 马腾,mateng@cug.edu.cn ;

基金项目: 国家自然科学基金(面上项目)资助(41372252)


中图分类号: X171.5

Effects of Humic Acid and Fulvic Acid on the Transportation of BDE-47 in Soil-Groundwater System

Wang Chunlei^1,2,
Liu Lu^1,2,
Ma Teng^1,2,,,
Chen Liuzhu^1,2,
Cai Hesheng^1,2
1. School of Environmental Studies, China University of Geosciences at Wuhan, Wuhan 430074, China;
2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China

Corresponding author: Ma Teng,mateng@cug.edu.cn ;

CLC number: X171.5

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摘要:多溴联苯醚(polybrominated diphenyl ethers,PBDEs)是土壤-地下水系统中广泛存在的有机污染物，研究土壤组分对其迁移行为的影响是解决土壤-地下水系统中多溴联苯醚归趋问题的关键。以典型多溴联苯醚同系物2,2',4,4'-四溴联苯醚(2,2',4,4'-tetrabromodiphenyl ether,BDE-47)为研究对象，选取胡敏酸(humic acid,HA)、富里酸(fulvic acid,FA)2种代表性土壤有机组分，配制不同浓度的FA、HA溶液(150 mg·L^-1、50 mg·L^-1)，分别对不同浓度的BDE-47(100 μg·g^-1、10 μg·g^-1)污染土壤进行土柱淋滤实验，探讨FA、HA对土壤-地下水系统中BDE-47迁移的影响。结果表明，HA作用下，实验组下层土壤中BDE-47的残留比例分别为0.62%和0.40%，分别低于对照组的0.72%和3.36%；FA作用下，实验组下层土壤中BDE-47的残留比例分别为6.40%和6.71%，分别高于对照组的0.72%和3.36%。结合HA和FA的元素组成和结构特征分析可知，疏水性强的HA能够促进BDE-47随水流迁移进入地下水系统；亲水性强的FA促进BDE-47在土壤系统中的分布，阻滞了土壤系统中BDE-47进入地下水系统。本文为评估HA、FA对土壤-地下水系统中BDE-47迁移的影响提供依据。
关键词: BDE-47/
胡敏酸/
富里酸/
迁移/
淋滤/
土壤/
地下水

Abstract:Polybrominated diphenyl ethers (PBDEs), as a kind of persistent organic pollutants, have been pervasively detected in the soil-groundwater systems. Determining the effects of soil composition on the transportation behaviors of PBDEs is the key of tracing their fate in the soil-groundwater system. The transportation of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47), a typical congener of PBDEs, was examined within soil columns containing agricultural soil amended with BDE-47 (100 μg·g^-1 and 10 μg·g^-1) at the surface layer, using humic acid (HA) and fulvic acid (FA) (150 mg·L^-1 and 50 mg·L^-1) as the leaching solutions, respectively. Results showed that in the soil below the surface layer, the residual ratios of BDE-47 with initial concentrations at 100 μg·g^-1 and 10 μg·g^-1 were 0.62% and 0.40% in the HA leaching groups, lower than that in the control groups of 0.72% and 3.36%, respectively. However, in the soil below the surface layer, the residual ratios of BDE-47 in the FA leaching groups were 6.40% and 6.71%, higher than that in the control groups, respectively. Combined with the element component analysis and structure feature analysis of HA and FA, HA of strong hydrophobicity could promote the migration of BDE-47 with the water into the groundwater system, while the hydrophilic FA promoted the dispersion of BDE-47 in soil system, but could retard BDE-47 to enter the groundwater system. This work provided fundamental evidence for evaluating the effects of HA and FA on the transportation of BDE-47 in the soil-groundwater system.
Key words:BDE-47/
humic acid/
fulvic acid/
transportation/
leach/