Sources and hydrogeological conditions that cause high iodine concentrations in deep groundwater in the Zhangwei watershed, North China Plain

2021 ◽  
Vol 80 (5) ◽  
Author(s):  
Yuanjing Zhang ◽  
Jianfeng Li ◽  
Qichen Hao ◽  
Chuanshun Zhi ◽  
Chuwen Cui ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
High Iodine ◽  
Deep Groundwater ◽  
Hydrogeological Conditions

scholarly journals Evaluation of Groundwater Suitability for Irrigation and Drinking Purposes in an Agricultural Region of the North China Plain

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3426
Author(s):  
Haipeng Guo ◽  
Muzi Li ◽  
Lu Wang ◽  
Yunlong Wang ◽  
Xisheng Zang ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
Shallow Groundwater ◽  
Deep Groundwater ◽  
The North ◽  
The North China Plain ◽  
Drinking Purposes ◽  
Groundwater Samples ◽  
Groundwater Suitability ◽  
Groundwater Wells

Groundwater is an irreplaceable resource for irrigation and drinking in the North China Plain, and the quality of groundwater is of great importance to human health and social development. In this study, using the information from 59 groups of groundwater samples, groundwater quality conditions for irrigation and drinking purposes in an agricultural region of the North China Plain were analyzed. The groundwater belongs to a Quaternary loose rock pore water aquifer. The depths of shallow groundwater wells are 20–150 m below the surface, while the depths of deep groundwater wells are 150–650 m. The sodium adsorption ratio (SAR), sodium percentage (%Na), residual sodium carbonate (RSC), magnesium hazard (MH), permotic index (PI) and electrical conductivity (EC) were selected as indexes to evaluate the shallow groundwater suitability for irrigation. What’s more, the deep groundwater suitability for drinking was assessed and the human health risk of excessive chemicals in groundwater was studied. Results revealed that SAR, Na% and RSC indexes indicated the applicability of shallow groundwater for agricultural irrigation in the study area. We found 57.1% of the shallow groundwater samples were located in high salinity with a low sodium hazard zone. The concentrations of fluorine (F−) in 79.0% of the deep groundwater samples and iodine (I−) in 21.1% of the deep groundwater samples exceeded the permissible limits, respectively. The total hazard quotient (HQ) values of fluorine in over half of the deep groundwater samples exceeded the safety limits, and the health risk degree was ranked from high to low as children, adult females and adult males. In addition to natural factors, the soil layer compression caused by groundwater over-exploitation increased the fluorine concentration in groundwater. Effective measures are needed to reduce the fluorine content of the groundwater of the study area.

scholarly journals Assessment of deep groundwater over-exploitation in the North China Plain

2011 ◽  
Vol 2 (4) ◽  
pp. 593-598 ◽  
Author(s):  
Jiansheng Shi ◽  
Zhao Wang ◽  
Zhaoji Zhang ◽  
Yuhong Fei ◽  
Yasong Li ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
Deep Groundwater ◽  
The North ◽  
The North China Plain ◽  
Over Exploitation

scholarly journals Differences in hydrogeochemistry between shallow and deep aquifers in the Baiyangdian basin, China

2019 ◽  
Vol 98 ◽  
pp. 07009
Author(s):  
Huaming Guo ◽  
Zhaoli Shen ◽  
Yi Chen ◽  
Kai Zhao ◽  
Haitao Li ◽  
...  
Keyword(s):  
Pore Water ◽  
North China Plain ◽  
North China ◽  
Major Ions ◽  
Shallow Groundwater ◽  
Water Isotopes ◽  
Silicate Weathering ◽  
Deep Groundwater ◽  
Deep Aquifers

Groundwater is the dominant long-term water resource for agricultural irrigation and industrial production in the Baiyangdian basin, North China Plain. Groundwater and pore-water were investigated to evaluate chemical evolution and geochemical processes in shallow and deep aquifers. Results show that both shallow groundwater and shallow pore-water had higher TDS, Ca2+, Mg2+, SO42-, and HCO3- concentrations than deep groundwater and deep pore-water. Generally, concentrations of groundwater major ions were higher than those of pore-water in shallow aquifers, while they were slightly lower in groundwater than in pore-water from deep aquifers. Water isotopes showed the meteoric origin of groundwater and pore-water, although evaporation signature was traced in shallow groundwater. Shallow groundwater also experienced carbonate dissolution and silicate weathering. Silicate weathering and evaporite dissolution were the major hydrogeochemical processes in deep aquifers. This study indicated that deep groundwater has better water quality, but is vulnerable to contamination from shallow groundwater with high TDS and NO3- concentrations.

scholarly journals The Mechanism of Iodine Enrichment in Groundwater from the North China Plain: Insight from Two Inland and Coastal Aquifer Sediment Boreholes

2021 ◽  
Author(s):  
Xiaobin Xue ◽  
Xianjun Xie ◽  
Junxia Li ◽  
Yuting Wang ◽  
Yanxin Wang
Keyword(s):  
Pore Water ◽  
North China Plain ◽  
North China ◽  
Bohai Bay ◽  
High Iodine ◽  
Migration Ability ◽  
Groundwater System ◽  
Fe Oxides ◽  
The North ◽  
The North China Plain

Abstract As an element relevant to human health, iodine is highly worthy of researchers’ attention, especially the mechanism of iodine migration and enrichment in groundwater systems. A total of 43 groundwater, 1 seawater, 107 sediment and 111 pore water samples from two boreholes (toward to Bohai Sea: BT, HH) were collected along a groundwater flow path at the North China Plain to investigate hydro-geochemical processes controlling groundwater iodine. High iodine groundwater (> 100 µg/L) was characterized by Na-Cl type, with high TDS values (827-2,400 mg/L) and high Cl (110–705 mg/L) and Br (416-1,180 µg/L) concentrations, which may be related to marine influence. Borehole BT and HH had pore water I concentration ranges of 1.4–132 µg/L and 3.6–830 µg/L, with high level occurred near to coastline and corresponded to ancient transgression events. The results of sequential extraction of borehole sediments indicate that the fractions of sediment inorganic iodine were mainly consist of exchangeable, carbonate and Fe-oxides associated fractions. Fe-oxides associated iodine was the main occurrence state in borehole BT far from the coastline, but high exchangeable iodine fractions (up to 92% of total extracted iodine) were observed in a high salinity borehole HH located near Bohai Bay, corresponding to the occurrence of high iodine pore water and groundwater. The analysis of iodine species indicates that iodide with strong migration ability dominated high iodine groundwater, pore water and exchangeable sediment iodine, reflecting the occurrence of adsorption/desorption processes of iodine in groundwater system. High iodine groundwater and pore water exhibited iodine enrichment relative to Cl and Br, suggests that iodine adsorbed on sediment desorbed under suitable pH and high solution ionic strength and subsequently released to pore water and aquifers. Inverse geochemical modeling stressed that ion exchange play an important role in iodine enrichment of groundwater system.

scholarly journals Using an ETWatch (RS)-UZF-MODFLOW Coupled Model to Optimize Joint Use of Transferred Water and Local Water Sources in a Saline Water Area of the North China Plain

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3361
Author(s):  
Xianglong Hou ◽  
Shiqin Wang ◽  
Xiaorui Jin ◽  
Mingliang Li ◽  
Mengyu Lv ◽  
...  
Keyword(s):  
Unsaturated Zone ◽  
North China Plain ◽  
North China ◽  
Saline Water ◽  
Regional Scale ◽  
Shallow Groundwater ◽  
Coupled Model ◽  
Water Area ◽  
Water Sources ◽  
Deep Groundwater

In the saline water area of our research, deep groundwater was over-pumped for agricultural irrigation which resulted in a decline of the deep groundwater level and an increase in the shallow groundwater table. Soil salination was also aggravated due to the strong evapotranspiration (ET) in the shallow groundwater areas, where ET removes water vapor from the unsaturated zone (ETu), and the groundwater (ETg). Joint utilities of multiple water sources of transferred water and local shallow and deep groundwater are essential for reasonable management of irrigation water. However, it is still difficult to distinguish ETu and ETg in coupled management of unsaturated zone and groundwater, which account for the water balance in utilities of multiple water sources in a regional scale. In this paper, we used an RS-based ETWatch model as a source of evapotranspiration data coupled with UZF-MODFLOW, an integrated hydrological model of the unsaturated–saturated zone, to estimate the ETg and ETu on a regional scale. It was shown that the coupled model (ETWatch-UZF-MODFLOW) avoids the influence of ETu on the groundwater balance calculation and improves the accuracy of the groundwater model. The model was used in the simulation and prediction of groundwater level. The eastern North China Plain (NCP) was selected as the study area where shallow groundwater was saline water and deep groundwater cone existed. We compared four different scenarios of irrigation methods, including current irrigation scenario, use of saline water, limited deep groundwater pumping, use of multiple water sources of transferred water and local groundwater. Results indicate that the total ETg for the four scenarios in the study area from 2013 to 2030 is 119 × 108 m3, 81.9 × 108 m3, 85.0 × 108 m3, and 92.3 × 108 m3, respectively, and the proportion of ETg to total ET was 6.85%, 4.79%, 4.97%, 5.37%. However, in regions where the groundwater depth is less than 3 m, ETg accounts for 12% of the total ET, indicating that groundwater was one of the main sources of evapotranspiration in shallow groundwater depth area.

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