title: Influence of the selective EDTA derivative phenyldiaminetetraacetic acid on the speciation and extraction of heavy metals from a contaminated soil.
abstract: The development of more selective chelators for the washing of heavy metal contaminated soil is desirable in order to avoid excessive dissolution of soil minerals. Speciation and mobility of Cu, Zn, Pb, and Ni in a contaminated soil washed with phenyldiaminetetraacetic acid (PDTA), a derivative of EDTA, were investigated by batch leaching test using a range of soil washing conditions followed by sequential extraction. With appropriate washing conditions, PDTA significantly enhanced extraction of Cu from the contaminated soil. The primary mechanisms of Cu extraction by PDTA were complexation-promoted dissolution of soil Cu and increased dissolution of soil organic matter (SOM). PDTA showed high selectivity for Cu(II) over soil component cations (Ca(II), Mg(II), Fe(III), Mn(II), Al(III)), especially at lower liquid-to-soil ratios under PDTA deficiency, thus avoiding unwanted dissolution of soil minerals during the soil washing process which can degrade soil structure and interfere with future land use. PDTA-enhanced soil washing increased the exchangeable fractions of Cu, Zn, and Pb and decreased their residual fractions, compared to their levels in unwashed soil.
authors.affiliation: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors.forename: Hang
authors.initials: H
authors.lastname: Wei
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, PR China. Electronic address: eesyxh@mail.sysu.edu.cn.
authors.forename: Xiu-Hong
authors.initials: XH
authors.lastname: Yang
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors.forename: Bing
authors.initials: B
authors.lastname: Xia
authors.affiliation: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors.forename: Jun-Min
authors.initials: JM
authors.lastname: Liu
authors.affiliation: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors.forename: Cheng-Yong
authors.initials: CY
authors.lastname: Su
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, PR China.
authors.forename: Rong-Liang
authors.initials: RL
authors.lastname: Qiu
mesh_terms: D002614:Chelating Agents / Q000737:chemistry*; D005591:Chemical Fractionation; D003300:Copper / Q000737:chemistry / Q000302:isolation & purification; D004492:Edetic Acid / Q000031:analogs & derivatives* / Q000737:chemistry*; D052918:Environmental Restoration and Remediation; D019216:Metals, Heavy / Q000737:chemistry* / Q000302:isolation & purification; D012989:Soil Pollutants / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D002614:Chelating Agents; D019216:Metals, Heavy; D012989:Soil Pollutants; D003300:Copper; D004492:Edetic Acid
keywords: Chelating agent; Dissolution; Heavy metal speciation; Soil organic matter; Soil washing