PMID- 35514370
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220716
IS  - 2046-2069 (Electronic)
IS  - 2046-2069 (Linking)
VI  - 10
IP  - 57
DP  - 2020 Sep 16
TI  - Impact of drying/wetting conditions on the binding characteristics of Cu(ii) and 
      Cd(ii) with sediment dissolved organic matter.
PG  - 34658-34669
LID - 10.1039/d0ra04839a [doi]
AB  - The biogeochemical processing of dissolved organic matter (DOM) in bottomland 
      sediment under drying/wetting conditions regulates the environmental behavior of 
      heavy metals. Although moisture is a critical factor, the structural 
      characteristics of DOM and its reactivity with heavy metals under drying/wetting 
      conditions are not well known. Herein, the response of DOM to drying/wetting 
      conditions and its influence on the binding of Cu(ii) and Cd(ii) onto DOM were 
      clarified via various multi-spectroscopic techniques. Ultraviolet-visible spectra 
      (UV-Vis) showed that higher aromatic, hydrophobic, and molecular weight fractions 
      were observed in sediment DOM under drying conditions than those under wetting 
      conditions. The binding abilities for Cd(ii) with DOM under drying/wetting 
      conditions are lower than those for Cu(ii). The stability constants between 
      Cu(ii) and DOM were found to decrease under drying/wetting conditions; however, 
      the binding capacities for Cu(ii) increased, especially under wetting conditions. 
      Two-dimensional correlation spectroscopy based on Fourier-transform infrared 
      (FTIR) and synchronous fluorescence spectra (SFS) showed that Cu(ii) and Cd(ii) 
      have different binding sequences and binding sites and that Cu(ii) has more 
      binding sites under drying and wetting conditions; however, Cd(ii) shows the 
      opposite behavior. These results clearly demonstrate that the binding of sediment 
      DOM with Cu(ii) is more prevalent and stable compared with Cd(ii) under drying 
      and wetting conditions. Because of its relatively low binding capacity and 
      binding stability, Cd(ii) can exhibit a high environmental hazard for migration 
      and transformation with DOM due to water flow under wetting conditions. This 
      study helps reveal the impact of drying/wetting conditions on the environmental 
      behavior of heavy metals in bottomland wetlands.
CI  - This journal is (c) The Royal Society of Chemistry.
FAU - Zhou, Mi
AU  - Zhou M
AD  - College of Resource and Environment Science, Hunan Normal University Changsha 
      410081 PR China lizw@hnu.edu.cn.
FAU - Li, Zhongwu
AU  - Li Z
AUID- ORCID: 0000-0003-0731-4582
AD  - College of Resource and Environment Science, Hunan Normal University Changsha 
      410081 PR China lizw@hnu.edu.cn.
AD  - College of Environmental Science and Engineering, Hunan University, Key 
      Laboratory of Environmental Biology and Pollution Control (Hunan University), 
      Ministry of Education Changsha Hunan 410082 PR China.
FAU - Huang, Mei
AU  - Huang M
AD  - College of Environmental Science and Engineering, Hunan University, Key 
      Laboratory of Environmental Biology and Pollution Control (Hunan University), 
      Ministry of Education Changsha Hunan 410082 PR China.
FAU - Ding, Xiang
AU  - Ding X
AD  - College of Environmental Science and Engineering, Hunan University, Key 
      Laboratory of Environmental Biology and Pollution Control (Hunan University), 
      Ministry of Education Changsha Hunan 410082 PR China.
FAU - Wen, Jiajun
AU  - Wen J
AD  - College of Environmental Science and Engineering, Hunan University, Key 
      Laboratory of Environmental Biology and Pollution Control (Hunan University), 
      Ministry of Education Changsha Hunan 410082 PR China.
FAU - Wang, Lei
AU  - Wang L
AD  - College of Resource and Environment Science, Hunan Normal University Changsha 
      410081 PR China lizw@hnu.edu.cn.
LA  - eng
PT  - Journal Article
DEP - 20200918
PL  - England
TA  - RSC Adv
JT  - RSC advances
JID - 101581657
PMC - PMC9056806
COIS- There are no conflicts to declare.
EDAT- 2020/09/18 00:00
MHDA- 2020/09/18 00:01
PMCR- 2020/09/18
CRDT- 2022/05/06 05:26
PHST- 2020/06/01 00:00 [received]
PHST- 2020/09/10 00:00 [accepted]
PHST- 2022/05/06 05:26 [entrez]
PHST- 2020/09/18 00:00 [pubmed]
PHST- 2020/09/18 00:01 [medline]
PHST- 2020/09/18 00:00 [pmc-release]
AID - d0ra04839a [pii]
AID - 10.1039/d0ra04839a [doi]
PST - epublish
SO  - RSC Adv. 2020 Sep 18;10(57):34658-34669. doi: 10.1039/d0ra04839a. eCollection 
      2020 Sep 16.