PMID- 33640821
OWN - NLM
STAT- MEDLINE
DCOM- 20210413
LR  - 20210413
IS  - 1873-6424 (Electronic)
IS  - 0269-7491 (Linking)
VI  - 277
DP  - 2021 May 15
TI  - Sources and migration of heavy metals in a karst water system under the threats 
      of an abandoned Pb-Zn mine, Southwest China.
PG  - 116774
LID - S0269-7491(21)00354-7 [pii]
LID - 10.1016/j.envpol.2021.116774 [doi]
AB  - Water quality is of great concern under the threats of an abandoned Pb-Zn mine 
      within a vulnerable karst area. This study focuses on tracing the sources, 
      migration and relevant geochemical controls of heavy metals along with surface- 
      and groundwater flow, and assessing their hazards posed to the environment by 
      indexes of heavy metal pollution (HPI) and ecological risks (ERI). We analyzed 
      the concentrations of lead (Pb), zinc (Zn), cadmium (Cd) and copper (Cu) in 
      filtered and digested surface water (SW) and groundwater (GW) samples. Whilst 
      sulfate concentrations, delta(34)S(SO4) isotope, and other physical-chemical 
      parameters were measured in filtered SW and GW. Clearly elevated concentrations 
      of Zn and Cd have been observed in the upstream of the Sidi River (max. 
      1540.3/1676.7, and 19.9/19.4 mug/L, for filtered/digested contents, respectively), 
      and that of digested Pb and Cu (max. 17.8 and 114.6 mug/L, respectively) in the 
      downstream karst groundwater. Zn and Cd are likely introduced by the Sidi River 
      which is found mostly in the dissolved phase. While Pb and Cu are sourced from 
      the remobilization of upper lying polluted soil which mostly existed in the 
      particulate phase. Zn and Cd concentrations in the karst groundwater peak at the 
      losing section while Pb and Cu in the river peaks at the gaining section as a 
      result of metals transport with SW-GW exchange. Dilution significantly decreases 
      total metals concentration in the non-karst area. Due to the buffer effect caused 
      by carbonates dissolution and bacterial sulfate reduction, a steady neutral pH 
      can reduce the concentrations of the dissolved metals in the karst area. The ERI 
      and HPI assessments show an acceptable level for surface- and groundwater. A 
      long-term observation on the contents of undissolved metals needs to be conducted 
      in karst areas which are threatened by metal(s) mines.
CI  - Copyright (c) 2021 Elsevier Ltd. All rights reserved.
FAU - Qin, Wenjing
AU  - Qin W
AD  - Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of 
      Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 
      Beijing, 100101, China; Sino-Danish College, University of Chinese Academy of 
      Sciences, Beijing, 100049, China.
FAU - Han, Dongmei
AU  - Han D
AD  - Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of 
      Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 
      Beijing, 100101, China; College of Resources and Environment, University of 
      Chinese Academy of Sciences, Beijing, 100049, China; Sino-Danish College, 
      University of Chinese Academy of Sciences, Beijing, 100049, China. Electronic 
      address: handm@igsnrr.ac.cn.
FAU - Song, Xianfang
AU  - Song X
AD  - Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of 
      Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 
      Beijing, 100101, China; College of Resources and Environment, University of 
      Chinese Academy of Sciences, Beijing, 100049, China; Sino-Danish College, 
      University of Chinese Academy of Sciences, Beijing, 100049, China.
FAU - Liu, Shaohua
AU  - Liu S
AD  - Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 
      541004, China; Ecosystem and Rocky Desertification Treatment Key Laboratory, 
      Ministry of Natural Resources, Guilin, 541004, China; Key Laboratory of Karst 
      Dynamics, Ministry of Natural Resources & Guangxi, Guilin, 541004, China.
LA  - eng
PT  - Journal Article
DEP - 20210218
PL  - England
TA  - Environ Pollut
JT  - Environmental pollution (Barking, Essex : 1987)
JID - 8804476
RN  - 0 (Metals, Heavy)
RN  - 0 (Soil Pollutants)
RN  - 0 (Water Pollutants, Chemical)
RN  - 059QF0KO0R (Water)
RN  - 2P299V784P (Lead)
RN  - J41CSQ7QDS (Zinc)
SB  - IM
MH  - China
MH  - Environmental Monitoring
MH  - Lead
MH  - *Metals, Heavy/analysis
MH  - Risk Assessment
MH  - *Soil Pollutants/analysis
MH  - Water
MH  - *Water Pollutants, Chemical/analysis
MH  - Zinc
OTO - NOTNLM
OT  - Groundwater
OT  - Heavy metals
OT  - Karst area
OT  - Surface water
OT  - Water quality
COIS- Declaration of competing interest There are no conflicts of interest to declare.
EDAT- 2021/03/01 06:00
MHDA- 2021/04/14 06:00
CRDT- 2021/02/28 20:37
PHST- 2020/11/24 00:00 [received]
PHST- 2021/02/08 00:00 [revised]
PHST- 2021/02/15 00:00 [accepted]
PHST- 2021/03/01 06:00 [pubmed]
PHST- 2021/04/14 06:00 [medline]
PHST- 2021/02/28 20:37 [entrez]
AID - S0269-7491(21)00354-7 [pii]
AID - 10.1016/j.envpol.2021.116774 [doi]
PST - ppublish
SO  - Environ Pollut. 2021 May 15;277:116774. doi: 10.1016/j.envpol.2021.116774. Epub 
      2021 Feb 18.