TY - JOUR
T1 - Combination of DGT and fluorescence spectroscopy for improved understanding of metal behaviour in mangrove wetland
AU - Lu, Haoliang
AU - Mei, Degang
AU - Pavao-Zuckerman, Mitchell
AU - Wang, Qiang
AU - Hong, Hualong
AU - Wu, Shengjie
AU - Xu, Mingyi
AU - Zhu, Xudong
AU - Liu, Jingchun
AU - Yan, Chongling
N1 - Funding Information:
This work was funded by the National Key Research and Development Program of China under contract No. 2017YFC0506102 and the National Natural Science Foundation of China (No. 31570503 ), and the China Scholarship Council (No. 201606315077 ), and the Key Laboratory of the Coastal and Wetland Ecosystems ( WELRI201601 ), and the State Key Laboratory of Marine Environmental Science ( MELRI1603 ) and the Fundamental Research Funds for the Central Universities of China ( 20720180118 ). The authors thank Qinhui Zeng for help in field sampling work. The authors thank Prof. John Merefield at Exeter University for having revised the English in this article.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/8
Y1 - 2019/8
N2 - Understanding bioavailable metal behaviour in situ is critical for pollution evaluation and contaminant management in mangrove wetland. Here, the diffusive gradients in thin films technique (DGT)was used for characterizing the (bio)available portions of Cr, Zn, Pb, Cu, Fe and Mn in two mangrove wetlands affected by industrial waste discharges (Jiulong Estuary)and domestic discharges (Zhangjiang Estuary), in Fujian Province, China. In addition, fluorescence excitation emission matrices-parallel factor analysis (EEM-PARAFAC)was applied for characterizing the occurrence and behaviour of dissolved organic matter (DOM)in soil solution, as well as their feasibility for assessing behaviours of metals. The results demonstrated that the combination of DGT and EEM, which are well suitable for studying DOM impacted metal behaviors in mangrove sediments. Discharge of difference wastewater into the mangrove wetlands of Jiulong and Zhangjiang Estuaries, gave rise to the DGT-labile metal concentration of Zn > Cu > Cr > Pb and Zn > Cr > Pb > Cu, respectively. A variety of humic-like fluorescent components was characterized here, providing valuable insights into the chemical composition of DOM in rhizosphere and bulk sediment. Terrestrial humic-like compounds indicated a different binding affinity for heavy metals in mangrove sediments. These findings are useful for the future understanding of the metal speciation and molecular binding mechanisms in such mangrove wetlands.
AB - Understanding bioavailable metal behaviour in situ is critical for pollution evaluation and contaminant management in mangrove wetland. Here, the diffusive gradients in thin films technique (DGT)was used for characterizing the (bio)available portions of Cr, Zn, Pb, Cu, Fe and Mn in two mangrove wetlands affected by industrial waste discharges (Jiulong Estuary)and domestic discharges (Zhangjiang Estuary), in Fujian Province, China. In addition, fluorescence excitation emission matrices-parallel factor analysis (EEM-PARAFAC)was applied for characterizing the occurrence and behaviour of dissolved organic matter (DOM)in soil solution, as well as their feasibility for assessing behaviours of metals. The results demonstrated that the combination of DGT and EEM, which are well suitable for studying DOM impacted metal behaviors in mangrove sediments. Discharge of difference wastewater into the mangrove wetlands of Jiulong and Zhangjiang Estuaries, gave rise to the DGT-labile metal concentration of Zn > Cu > Cr > Pb and Zn > Cr > Pb > Cu, respectively. A variety of humic-like fluorescent components was characterized here, providing valuable insights into the chemical composition of DOM in rhizosphere and bulk sediment. Terrestrial humic-like compounds indicated a different binding affinity for heavy metals in mangrove sediments. These findings are useful for the future understanding of the metal speciation and molecular binding mechanisms in such mangrove wetlands.
KW - Diffusive gradients in thin films
KW - Dissolved organic matter
KW - Fluorescence excitation emission matrices
KW - Mangrove sediments
KW - Metal bioavailability
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U2 - 10.1016/j.chemosphere.2019.05.002
DO - 10.1016/j.chemosphere.2019.05.002
M3 - Article
C2 - 31078887
AN - SCOPUS:85065785186
SN - 0045-6535
VL - 229
SP - 303
EP - 313
JO - Chemosphere
JF - Chemosphere
ER -