Zongyu Chen's research while affiliated with Chinese Academy of Geological Sciences and other places

Publications (49)

Article
Degradation of 1,2,3-trichloropropane (TCP) to allyl chloride (AC) by Dehalogenimonas (Dhg), the only reported TCP anaerobic reductive dechlorinating microorganism so far, has been demonstrated to be effective for in-situ bioremediation (ISB) of groundwater. This process is found viable when augmented with the fermentable organic substrate, yet its...
Article
Identifying nitrate sources and their temporal evolution in different land use is important for the sustainable management of groundwater resources. In this study, groundwater dating (³H–³He and time series of ³H) was combined with chemical and stable isotope analyses to resolve the evolution of nitrate sources and the driving mechanism of nitrate...
Article
1,2,3-trichloropropane (TCP), a refractory contaminant, can be reductive dehalogenated to allyl chloride (AC) by microorganisms, which has been shown a potential in situ bioremediation (ISB) strategy for TCP remediation in groundwater. In practice, however, it is hard to monitor the bioreduction extent because the TCP concentrations may also be dec...
Article
Full-text available
Groundwater quality in the Muling–Xingkai Plain (MXP) is closely related to food security and human health. The chemical composition of groundwater in MXP has attracted great attention. A total of 168 groundwater samples were collected in MXP, and principal component analysis, chemical ion analysis and stable isotopic analysis were used to explore...
Article
Full-text available
Karst watershed refers to the total range of surface and underground recharge areas of rivers (including subterranean rivers and surface rivers) in karst areas. Karst water resources, as the primary source of domestic water supply in southwest China, are vital for the social and economic development of these regions. These resources are greatly sig...
Article
Clay aquitards are semipermeable membranes that allow groundwater flow while retarding solute migration have been researched extensively but also subjected to much debate. At present, there is no evidence of whether the physical and chemical properties of clay soil and the isotopic composition of pore water affect the semipermeable membrane effect....
Article
Natural attenuation (NA) is a cost-effective and sustainable clean up technique for remedying groundwater contaminants, especially hydrocarbons, and redox zonation is a crucial subdivision of NA. However, the present Terminal Electron Acceptor Processes (TEAPs) approach, established in the 1990s, does not adequately determine the redox boundary, an...
Article
Water-rock interactions occurring during fracturing and flowback in shale gas reservoirs may dominate some chemical and isotopic compositions of hydraulic fracturing flowback fluids (HFFF) by imparting characteristic compositions of the continental shale to the HFFF. In this paper, a simple conservative mixing model (SCMM) and a progressive conserv...
Article
Iodine-rich groundwater is a cause for concern because it is harmful to human health, and determining the sources of groundwater iodine in coastal urbanized areas is complicated. This study aims to delineate the spatial distribution of groundwater iodide in various shallow and unconfined aquifers, as well as in areas with different urbanization lev...
Article
High nitrogen loading in aquifers is an important issue because of its harmful effects on human health; its origins are often complicated, especially in urbanized areas. This study aims to investigate the distributions of nitrate, nitrite, and ammonium in various aquifers in the Pearl River Delta, and to identify their main sources using hydrochemi...
Article
Isotopes and hydrochemistry were used to characterize the recharge and flow of groundwater in the arid Santanghu basin in Northwest China. The results of isotopic measurement and hydrochemical facies indicate that the predominant recharge mechanism is via rivers and streams. Modern recharge only occurs in the piedmont area of Moqinwula Mountains by...
Article
The fate of phosphorus in groundwater needs to be understood because phosphorus-rich groundwater is discharged into surface water bodies, which causes eutrophication, especially in urbanized areas. The present study investigated the spatial distributions and driving forces related to the groundwater phosphate levels in various aquifers in the Pearl...
Article
Groundwater dating by radio-krypton (⁸¹Kr; half-life of about 229,000 years) was applied to the sedimentary basin aquifer of the North China Plain (NCP). Krypton gas extracted from deep groundwater in the Coastal Plain was analyzed for ⁸¹Kr/Kr ratios by Atom Trap Trace Analysis, which yielded normalized ratios of 0.05 to 0.20, corresponding to grou...
Article
The use of isotope tracers as a tool for assessing aquifer responses to intensive exploitation is demonstrated and used to attain a better understanding of the sustainability of intensively exploited aquifers in the North China Plain. Eleven well sites were selected that have long-term (years 1985–2014) analysis data of isotopic tracers. The stable...
Article
The stress imposed on groundwater resources due to intensively exploited aquifer has resulted in groundwater depletion in the North China Plain (NCP). Management of groundwater resources needs to understand the changes or dynamic responses due to the exploitation. The response of groundwater systems to intensive exploitation and groundwater availab...
Article
Most of the shale gas production in northwest China is from continental shale. Identifying hydrogeochemical and isotopic indicators of toxic hydraulic fracturing flowback fluids (HFFF) has great significance in assessing the safety of drinking water from shallow groundwater and stream water. Hydrogeochemical and isotopic data for HFFF from the Dame...
Article
Natural background levels (NBLs) are commonly used to serve as references when assessing the contamination status of groundwater units. In this study, a methodology based on hydrogeochemistry and statistics was proposed to derive NBLs. A comprehensive understanding of the evolution of groundwater chemistry was acquired and the impact of natural and...
Article
Full-text available
Aquifer group classification is a prerequisite for groundwater resources evaluation as well as groundwater utilization, which making an important effect on human being living and production activities. So far, lithology is the primary criteria in aquifer group classification, but the available and specific supporting ideas are still insufficient. S...
Article
Redox conditions and arsenic (As) loads may affect the aging mechanisms of As in soils. A batch experiment of one wastewater-irrigated soil under four different conditions was performed to investigate the impact of redox conditions and As loads on the aging mechanisms of As in soils in this study. The results showed that the aerobic condition subst...
Article
Full-text available
The origin and evolution of brine and saline groundwater have always been a challenged work for geochemists and hydrogeologists. Chemical and isotopic data of brine and saline waters were used to trace the sources of salinity and therefore to understand the transport mechanisms of groundwater in Xishanzui, Inner Mongolia. Both Cl/Br (molar) versus...
Article
Full-text available
The present study focused on the influence of temperature variation on the aging mechanisms of arsenic in soils. The results showed that higher temperature aggravated the decrease of more mobilizable fractions and the increase of less mobilizable or immobilizable fractions in soils over time. During the aging process, the redistribution of both car...
Article
Full-text available
It is extremely important for water resources management to understand the mechanisms of recharge to aquifer. Monitoring changes in stable isotopes (δ 2H and δ 18O) can be used to learn some information on groundwater recharge processes. In this study, the stable isotopes from precipitation and groundwater samples were employed to trace the recharg...
Article
Full-text available
The objective of this study is to investigate the impacts of anthropogenic and natural processes on the granular aquifer (GA) and the fractured rock aquifer (FRA) in the central region of Guangzhou city. Results indicate that 47.8% and 30.4% of samples in GA are not suitable for drinking and industrial purposes respectively, mainly due to the high...
Article
Dissolved helium concentrations and 3He/4He ratios were measured for 18 groundwater samples collected from the Quaternary confined aquifers in the North China Plain (NCP). The dissolved helium concentrations ranged from 1 × 10-7 to 1 × 10-6 cm3STP·g-1 in the 14 samples from the central plain, but was approximately two orders of magnitude higher, be...
Article
The objective of this study was to test indicators and improve the assessment of groundwater sustainability by using a synthetic method. An indicator system of groundwater sustainability was constructed under the framework of driver–pressure–state–impact–response, and a method for the assessment of groundwater sustainability was developed by using...
Article
Full-text available
Using by sequential extraction procedures to obtain the chemical forms of arsenic in soils can provide useful information for the assessment of arsenic mobility and bioavailability in soils. However, sample pretreatments before the extraction probably have some effects on the fractionation of arsenic in soils. Impact of sample pretreatments (freeze...
Article
The distribution of arsenic (As) in shallow groundwater of eastern Chancheng District in Foshan City as a function of season and water table was investigated, and the influence of hydrochemical factors on the As distribution was discussed. The groundwater samples were collected from 20 sites in dry season and 9 sites in wet season. As concentration...
Article
It becomes an increasing concern that groundwater quality in exploited deep confined aquifer may deteriorate due to brackish water leakage from its overlying saline aquifer in Hebei Plain. However, the monitoring data show that the TDS does not significantly change in the exploited aquifer. Some physics or chemistry processes must have taken place...
Article
Full-text available
Anthropogenic factors resulted from the urbanization may affect the groundwater As in urbanized areas. Groundwater samples from the Guangzhou city (South China) were collected for As and other parameter analysis, in order to assess the impact of urbanization and natural processes on As distribution in aquifers. Nearly 25.5 % of groundwater samples...
Article
Environmental tracers are proving to be a unique tool for assessing groundwater sustainability, such as characterization of recharge, identification of pathways and sources of contaminants, and prediction of groundwater change in response to excessive abstraction. This paper helps to better understand the groundwater sustainability in the Quaternar...
Article
The deformation of aquitard is the main contribution to land subsidence in the North China Plain, and the water released from aquitard compaction may be a large portion of the exploited groundwater. In this study, the consolidation test was employed to understand the mechanics on the drainage and deformation of aquitard. The results suggested the s...
Article
Full-text available
The present study is aimed at assessing the water quality and discussing the hydrochemical characteristics and seasonal variation of shallow groundwater on the aspect of metals in the eastern Chancheng district of Foshan city, south China. Multivariate analytical methods such as principal components analysis (PCA) and hierarchical cluster analysis...
Article
The concentrations of chlorofluorocarbons (CFC-11, CFC-12 and CFC-113) and tritium (3H) content in groundwater were used to date groundwater age, delineate groundwater flow systems and estimate flow velocity in the Hohhot basin. The estimated young groundwater age is fallen in the bracket of 21 ~ 50 a and indicates the presence of two different age...
Article
The present work investigates the adsorption of As (III) on a soil irrigated by sewage, as a function of reaction time, initial As (III) concentrations, pH, phosphate, and humic acid. The results show that As (III) adsorption onto the soil takes place in two processes: a fast one that takes place in less than 1 h and a slow one that takes place in...
Article
Full-text available
Groundwater quality is the critical factor that affects human health and the quality of industrial products in Foshan City, South China. Multivariate statistical techniques, including hierarchical cluster analysis (HCA) and principal component analysis (PCA), were applied to evaluate and interpret the complex groundwater quality in eastern Chanchen...
Article
Full-text available
The aim of the present work is to investigate the distribution and possible sources of phthalate esters (PAEs) in groundwater and surface water of a subtropical Dongguan city, South China. Groundwater and surface water samples were collected from fifty-six and nine sampling sites in 2006, respectively. Concentrations of six PAE compounds (Σ6PAEs) i...
Conference Paper
The relation between isotopic compositions of precipitation and surface air temperature provides an unique tool for paleoclimate studies. Ananysis was conducted of monthly and annual mean delta O-18 content of precipitation and surface air temperature for spatial and a fixed location by using the the data of China (1985 similar to 2002) in Global N...
Article
The recharge sources and groundwater age in the Songnen Plain, Northeast China, were confirmed using environmental isotopes. The isotopic signatures of the unconfined aquifers in the southeast elevated plain and the north and west piedmont, cluster along local meteoric water lines (LMWLs) with a slope of about 5. The signature of source water was o...
Article
The recharge sources and groundwater age in the Songnen Plain, Northeast China, were confirmed using environmental isotopes. The isotopic signatures of the unconfined aquifers in the southeast elevated plain and the north and west piedmont, cluster along local meteoric water lines (LMWLs) with a slope of about 5. The signature of source water was o...
Article
Full-text available
We employed environmental tracers (3H-3He, SF6) in a study investigating the groundwater recharge in the North China Plain (NCP), a sedimentary aquifer system consisting of fluvial and alluvial river deposits near the city of Shijiazhuang. The 3H-3He dating method revealed reasonable results for the young groundwater with ages covering the range of...
Article
Full-text available
1] We employed environmental tracers (3 H‐ 3 He, noble gases, stable isotopes 18 O and 2 H) to study groundwater recharge and residence times in the strongly exploited North China Plain aquifer system in the area of Shijiazhuang, the capital of the Hebei province. Groundwater in the unconfined parts of the piedmont plain contains tritium down to de...
Article
The well-known temperature dependence of noble gas solubilities in water enables the determination of absolute paleotemperature records from radiocarbon dated groundwater. An advantage of the noble gas paleothermometer is that noble gas temperatures (NGTs) can directly be related to stable isotope ratios from the same groundwater archive in order t...
Article
The recharge and origin of groundwater and its residence time were studied using environmental isotopic measurements in samples from the Heihe River Basin, China. δ18O and δD values of both river water and groundwater were within the same ranges as those found in the alluvial fan zone, and lay slightly above the local meteoric water line (δD=6.87δ1...
Article
The recharge and origin of groundwater and its residence time were studied using environmental isotopic measurements in samples from the Heihe River Basin, China. δ18O and δD values of both river water and groundwater were within the same ranges as those found in the alluvial fan zone, and lay slightly above the local meteoric water line (δD=6.87δ1...

Citations

... The soil concentration of nitrogen compounds is caused both by anthropogenic sources and natural biogeochemical processes [7], with anthropogenic sources having the greatest impact on the environment. Nitrogen pollution derives, for instance, from landfill leachate runoff, the deposition of waste from the agricultural sector on soil, or industrial and municipal discharges that are not appropriately treated [8,9]. ...
... Coarse-textured soils with high infiltration capacity only distribute in the riverine areas ( Figure 2). Rock debris and soils are consisted of quartz (52%), plagioclase (21%), clay mineral (16%), potassium feldspar (10%) and carbonates (1%) (Su et al., 2022). ...
... HYDROL-DC employs a linear reservoir function to simulate groundwater discharge based on soil percolation, resulting in possible underestimation of discharge when there is no sufficient replenishment. Previous studies using similar functions had the same issue in simulating groundwater discharge under dry climate conditions [65][66][67]. ...
... Water quality analysis shows that the produced water has high salinity and different concentrations of organic pollutants, bacteria, suspended solids, natural radioactive material (U), and toxic metals [1,9,10]. Managing the produced water poses a significant challenge for the natural gas industry [5,8,11]. ...
... Moreover, PC4 had a moderate negative loading with Ba of −0.67 (Figure 5a). In FW, PC3 had strong positive loading with F − and Sr of 0.89 and 0.84, respectively (Figure 5b), indicating that they have the same source or geochemical behavior [12]. In addition, PC3 had weak positive loading with Na + and weak negative loading with NO 3 − , in which the loading was 0.37 and −0.31, respectively. ...
... These indicate that the δ 11 B of groundwater is expected to have a significant response to continental HFFF contamination in the study area. The boron isotope characteristics of the HFFF were mainly evolved by the mixing of a shale formation water in which dissolution of non-marine borates (−30.1 to 10.2‰ with mean value of 4‰) has occurred during the formation of the Dameigou Shale, and the water-rock interactions were dominated by the dissolution of boron-bearing alkali feldspars during hydraulic fracturing and subsequent flowback periods [42]. Conversely, the boron isotope characteristics of the shallow groundwater were mainly imparted by the local rainwater (δ 11 B = 16.7‰), which is the major source of groundwater recharge, and groundwater in specific aquifers (NG2) was further altered by clay adsorption [43,44]. ...
... The 14 C s proxy described in this study can be used to model groundwater transit times rather than direct measurement of 14 C gw . Measurements of 14 C gw are commonly used to estimate aquifer transit times, and many methods have been developed to do this by not only considering the radioactive decay of 14 C along the flowpath, but also corrections including the distiubution of flowpath lengths sampled (e.g., Jurgens et al. 2016;Broers et al. 2021) and the input of 14 C in pre-recharge atmosphere, DIC from the dissolution of aquifer materials, or soil CO 2 (Fontes and Garnier 1979;Kalin 2000;Clark and Fritz 2013;Clark 2015;Han and Plummer 2016;Cartwright et al. 2020;Wang et al. 2020 and references therein). Models of groundwater transit time demonstrate relatively small sensitivity to errors in 14 C input values compared with flowpath geometries, model type, and other associated uncertainties (e.g., initial δ 13 C, heterogeneity in the stable isotope ratios of matrix calcite, open-system carbonate dissolution, methanogenesis; Cartwright et al. 2020). ...
... Therefore, the study of groundwater chemistry is closely related to the ecological environment. [1][2][3], while the changes in the chemical environment of groundwater are closely associated with ecological stability and water safety [1,4,5]. Research on the chemical characteristics and formation mechanisms of groundwater is helpful in understanding the change processes of the groundwater environment and facilitating the scientific and rational protection and development of groundwater resources [6,7]. ...
... The 14 C measurement was completed by the Beta Analytic, Inc., Miami, Florida, USA. Details of 3 H measurement can be found in Chen et al. (2011) and of 14 C measurements can be found in https://www.radiocarbon.com/. ...
... According to the geomorphic differences, the Heihe River Basin can be divided into the Qilian mountain area upstream, the alluvial plain midstream, the Jinta-Dingxin basin and Ejina basin downstream. The average annual precipitation is 200 ~ 500 mm upstream, 50 ~ 150 mm midstream and less than 50 mm downstream (Chen et al. 2006;Wu et al. 2010). The Heihe River Basin is located in the arid inland region of Northwest China where water resources are very scarce. ...