title: Identification of Scirpus triqueter root exudates and the effects of organic acids on desorption and bioavailability of pyrene and lead in co-contaminated wetland soils.
abstract: Root exudates (REs) of Scirpus triqueter were extracted from the rhizosphere soil in this study. The components in the REs were identified by GC-MS. Many organic acids, such as hexadecanoic acid, pentadecanoic acid, vanillic acid, octadecanoic acid, citric acid, succinic acid, glutaric acid, and so on, were found. Batch simulated experiments were conducted to evaluate the impacts of different organic acids, such as citric acid, artificial root exudates (ARE), succinic acid, and glutaric acid in REs of S. triqueter on desorption of pyrene (PYR) and lead (Pb) in co-contaminated wetland soils. The desorption amount of PYR and Pb increased with the rise in concentrations of organic acids in the range of 0-50 g·L(-1), within shaking time of 2-24 h. The desorption effects of PYR and Pb in soils with various organic acids treatments decreased in the following order: citric acid > ARE > succinic acid > glutaric acid. The desorption rate of PYR and Pb was higher in co-contaminated soil than in single pollution soil. The impacts of organic acids in REs of S. triqueter on bioavailability of PYR and Pb suggested that organic acids enhanced the bioavailability of PYR and Pb in wetland soil, and the bioavailability effects of organic acids generally followed the same order as that of desorption effects.
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai, 200444, China.
authors.forename: Yunyun
authors.initials: Y
authors.lastname: Hou
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai, 200444, China. lxy999@shu.edu.cn.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Liu
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai, 200444, China. zhangxinying008@163.com.
authors.forename: Xinying
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai, 200444, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Chen
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai, 200444, China.
authors.forename: Kaiyun
authors.initials: K
authors.lastname: Tao
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai, 200444, China.
authors.forename: Xueping
authors.initials: X
authors.lastname: Chen
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai, 200444, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Liang
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai, 200444, China.
authors.forename: Chiquan
authors.initials: C
authors.lastname: He
mesh_terms: D000143:Acids; D000327:Adsorption; D001673:Biodegradation, Environmental; D002264:Carboxylic Acids / Q000737:chemistry*; D029785:Cyperaceae / Q000737:chemistry; D007854:Lead / Q000032:analysis* / Q000737:chemistry; D009930:Organic Chemicals; D018517:Plant Roots / Q000737:chemistry; D011721:Pyrenes / Q000032:analysis* / Q000737:chemistry; D058441:Rhizosphere; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D053833:Wetlands
chemical_list: D000143:Acids; D002264:Carboxylic Acids; D009930:Organic Chemicals; D011721:Pyrenes; D012987:Soil; D012989:Soil Pollutants; D007854:Lead; C030984:pyrene
keywords: Bioavailability; Desorption; Organic acids; Pyrene-lead co-contaminated wetland soils; Root exudates; Scirpus triqueter