A regional-scale assessment of micro-organic contaminants in shallow groundwater in the Pearl River Delta, China

2020 ◽  
pp. 1-14
Author(s):  
Jincui Wang ◽  
Bing Zhou ◽  
Haiwei Cui ◽  
Chunyan Liu ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Organic Contaminants ◽  
Pearl River Delta ◽  
Regional Scale ◽  
Shallow Groundwater ◽  
River Delta ◽  
Pearl River ◽  
The Pearl River Delta ◽  
Scale Assessment ◽  
The Pearl River

scholarly journals A Regional Scale Investigation on Groundwater Arsenic in Different Types of Aquifers in the Pearl River Delta, China

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Qinxuan Hou ◽  
Jichao Sun ◽  
Jihong Jing ◽  
Chunyan Liu ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Pearl River Delta ◽  
Regional Scale ◽  
River Delta ◽  
Pearl River ◽  
Karst Aquifers ◽  
The Pearl River Delta ◽  
Groundwater Arsenic ◽  
Different Types ◽  
High Concentrations ◽  
The Pearl River

Nearly 400 groundwater samples were collected from different types of aquifers in the Pearl River Delta (PRD), and the concentrations of groundwater arsenic (As) and other 22 hydrochemical parameters in different types of aquifers were then investigated. Results showed that groundwater As concentration was up to hundreds μg/L in granular aquifers, while those in fissured aquifers and karst aquifers were only up to dozens and several μg/L, respectively. Correspondingly, about 9.4% and 2.3% samples with high concentrations (>0.01 mg/L) of As were in granular and fissured aquifers, respectively, but no samples with high concentration of As were in karst aquifers. The source and mobilization of groundwater As in granular aquifers are likely controlled by the following mechanism: organic matter in marine strata was mineralized and provided electrons for electron acceptors, resulting in the release of NH4+ and I- and the reduction of Fe/Mn and NO3-, and was accompanied with the mobilization of As from sediments into groundwater. By contrast, both natural processes including the competitive adsorption between As anions and F-/PO43-/HCO3- and anthropogenic processes including industrialization were responsible for high concentrations of groundwater As in fissured aquifers.

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