Effects of root exudates on the leachability, distribution, and bioavailability of phenanthrene and pyrene from mangrove sediments

被引：26

作者：

Jia, Hui ^{[1
]}

Lu, Haoliang ^{[1
]}

Liu, Jingchun ^{[1
]}

Li, Jian ^{[1
]}

Dai, Minyue ^{[1
]}

Yan, Chongling ^{[1
]}

机构：

[1] Xiamen Univ, Key Lab Minist Educ Coastal & Wetland Ecosyst, Xiamen 361102, Peoples R China

来源：

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2016年 / 23卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Phenanthrene; Pyrene; Root exudates; Elution; Dissolved organic carbon (DOC); Mangrove; WEIGHT ORGANIC-ACIDS; POLYCYCLIC AROMATIC-HYDROCARBONS; KANDELIA-OBOVATA S; CANDEL L. DRUCE; ORGANOCHLORINE PESTICIDES; BUTANOL EXTRACTION; SOILS; CADMIUM; DESORPTION; WATER;

D O I：

10.1007/s11356-015-5772-0

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this study, column leaching experiments were used to evaluate the leachability, distribution and bioavailability of phenanthrene and pyrene by root exudates from contaminated mangrove sediments. We observed that root exudates significantly promoted the release and enhanced the bioavailability of phenanthrene and pyrene from sediment columns. The concentration of phenanthrene and pyrene and cumulative content released from the analyzed sediment samples following root exudate rinsing decreased in the following order: citric acid > oxalic acid > malic acid. After elution, the total concentrations of phenanthrene and pyrene in sediment layers followed a descending order of bottom (9-12 cm) > middle (5-7 cm) > top (0-3 cm). Furthermore, a positive correlation between leachate pH values and PAH concentrations of the leachate was found. Consequently, the addition of root exudates can increase the leachability and bioavailability of phenanthrene and pyrene.

引用

页码：5566 / 5576

页数：11

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