Spatial distribution and origin of shallow groundwater iodide in a rapidly urbanized delta: A case study of the Pearl River Delta

Huang, Guanxing; Liu, Chunyan; Li, Liangping; Zhang, Fenge; Chen, Zongyu

doi:10.1016/j.jhydrol.2020.124860

Cited by 48 publications

(34 citation statements)

References 40 publications

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“…Thus, we speculate that groundwater Hg in porous aquifers in agricultural lands in the PRD is a geogenic source, not anthropogenic source. On the other hand, Huang et al [ 10 ] reported that the high level of I − in porous aquifers in the PRD was mainly due to the reductive dissolution of iodine-loaded Fe (oxy)hydroxides and decomposition of iodine-rich organic matter in sediments. Correspondingly, the concentration of groundwater I − in porous aquifers in agricultural lands in the PRD was as high as 0.59 mg/L ( Table 3 ), much higher than that in contaminated surface water (<0.2 mg/L) in the PRD [ 10 ].…”

Section: Resultsmentioning

confidence: 99%

“…Rotation of the PCs was conducted using the Varimax method, and PCs with eigenvalues >1 were retained for analyses. The terms “strong,” “moderate,” and “weak” (as applied to PC loadings) referred to the absolute loading values of >0.75, 0.75–0.5, and 0.5–0.3, respectively [ 10 ].…”

Section: Methodsmentioning

confidence: 99%

“…For instance, nitrogen fertilizers are used to increase crop yields and result in groundwater nitrate contamination because of the leaching of nitrate from farmland [ 8 ]. In the PRD, the groundwater quality in agricultural areas is not only affected by agricultural activities but may also be influenced by urbanization and industrialization, because agricultural lands are sometimes near urbanized areas [ 9 , 10 ]. Nowadays, factors controlling groundwater quality in agricultural areas in the PRD are also little known.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Groundwater Quality in Agricultural Lands Near a Rapidly Urbanized Area, South China

Liu

Wang

2021

IJERPH

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Understanding the groundwater quality and its factors is a key issue in the context of the use and protection of groundwater resources in agricultural areas near urbanized areas. This study assessed the groundwater quality in agricultural areas in the Pearl River Delta (PRD) by a fuzzy synthetic evaluation method and determined the main factors controlling the groundwater quality by principal component analysis (PCA). Results showed that approximately 85% of groundwater sites in agricultural lands in the PRD were good-quality (drinkable). Drinkable groundwater was 95% and 80% in fissured aquifers and porous aquifers, respectively. Poor-quality groundwater in porous aquifers was controlled by four factors according to the PCA, including the seawater intrusion; the lateral recharge and irrigation of surface water and geogenic sources for As, Fe, NH4+, and Mn; the wastewater infiltration; and the geogenic sources for iodide. By contrast, another four factors, including the infiltration of wastewater and agricultural fertilizers, the geogenic sources for heavy metals, the geogenic sources for iodide, and the irrigation of contaminated river water, were responsible for the poor-quality groundwater in fissured aquifers. Therefore, in the future, the groundwater protection in agricultural lands in the PRD should be strengthened because the majority of groundwater in these areas was good-quality and suitable for drinking and agricultural purposes. In addition, poor-quality groundwater in agricultural lands in the PRD was a small proportion and negligible because the factors for poor-quality groundwater are complicated.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Groundwater Quality in Agricultural Lands Near a Rapidly Urbanized Area, South China

Liu

Wang

2021

IJERPH

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“…Groundwaters were sampled in 2.5 L clean high-density polyethylene bottles that had been thoroughly prewashed with the target water. Samples were sent to the Laboratory of Groundwater Sciences [15,35]. All samples had relative errors within ±6%.…”

Section: Sample Collection and Analysismentioning

confidence: 99%

“…During the long residence time, it has sufficient time to interact with the surrounding media of the aquifers [9,10], and harmful elements such as fluoride, arsenic, and other toxic elements can become dissolved [11][12][13][14]. In addition, many external elements in groundwater have been shown to be elevated in recent decades in many regions around the world [15][16][17][18][19][20]. For instance, nitrogen including nitrates, nitrites, and ammonia in aquifers have been found to be elevated in both urban and agricultural areas.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Groundwater Contamination and Health Implications in a Typical Semiarid Basin of North China

Yin

Xiao

Han³

et al. 2020

Water

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Groundwater chemistry and its potential health risks are as important as water availability in arid and semiarid regions. This study was conducted to determine the contamination and associated health threats to various populations in a semiarid basin of north China. A total of 78 groundwater samples were collected from the shallow unconfined aquifers. The results showed that the phreatic water was slightly alkaline, hard fresh water with ions in the order of Ca2+ > Na++K+ > Mg2+ and HCO3− > SO42− > Cl−. Four hydrochemical elements, NO3−, F−, Mn and Zn, exceeded the permissible limits. NO3− and F− contaminants may pose health risks to local residents, while the risks of Mn and Zn are negligible. Dermal exposure is safe for all populations, while the oral pathway is not. Minors (i.e., infants and children) are susceptible to both NO3− and F− contaminants, and adults only to NO3−. The susceptibility of various populations is in the order of infants > children > adult males > adult females. Anthropogenic activities are responsible for the elevated levels of NO3−, Zn, Total dissolved solids (TDS), while F− and Mn are from geogenic sources. Thus, differential water supplies, strict control of waste, and rational irrigation practices are encouraged in the basin.

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Natural background levels and driving factors of aluminum in shallow groundwater of an urbanized delta: Insight from eliminating anthropogenic‐impacted groundwaters

Yan,

Yang,

Hou

2024

Water Environment Research

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Knowledge on natural background levels (NBLs) of aluminum (Al) in groundwater can accurately assess groundwater Al contamination at a regional scale. However, it has received little attention. This study used a combination of preselection and statistic methods consisting of the oxidation capacity and the boxplot iteration methods to evaluate the NBL of shallow groundwater Al in four groundwater units of the Pearl River Delta (PRD) via eliminating anthropogenic‐impacted groundwaters and to discuss driving factors controlling high NBLs of Al in groundwater in this area. A total of 280 water samples were collected, and 18 physico‐chemical parameters including Redox potential, dissolved oxygen, pH, total dissolved solids, HCO3−, NH4+, NO3−, SO42−, Cl−, NO2−, F−, K+, Na+, Ca2+, Mg2+, Fe, Mn, and Al were analyzed. Results showed that groundwater Al NBLs in groundwater units A‐D were 0.11, 0.16, 0.15, and 0.08 mg/L, respectively. The used method in this study is acceptable for the assessment of groundwater Al NBLs in the PRD, because groundwater Al concentrations in various groundwater units in residual datasets were independent of land‐use types, but they were opposite in the original datasets. The dissolution of Al‐rich minerals in sediments/rocks was the major source for groundwater Al NBLs in the PRD, and the interaction with Al‐rich river water was secondary one. The high groundwater Al NBL in groundwater unit B was mainly attributed to the acid precipitation and the organic matter mineralization inducing the release of Al in Quaternary sediments. By contrast, the high groundwater Al NBL in groundwater unit C mainly was ascribed to the release of Al complexes such as fluoroaluminate from rocks/soils into groundwater induced by acid precipitation, but it was limited by the dissolution of Mg minerals (e.g., dolomite) in aquifers. This study provides not only useful groundwater Al NBLs for the evaluation of groundwater Al contamination but also a reference for understanding the natural geochemical factors controlling groundwater Al in urbanized deltas such as the PRD.Practitioner Points The natural background level (NBL) of groundwater aluminum in the Pearl River Delta (PRD) was evaluated. The dissolution of aluminum‐rich minerals in sediments/rocks was the major source for groundwater aluminum NBLs in the PRD. The acid precipitation and organic matter mineralization contribute to high groundwater Al NBL in the groundwater unit B. The acid precipitation contributes to high groundwater Al NBL in the groundwater unit C, while dissolution of magnesium minerals limits it.

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Spatial distribution and origin of shallow groundwater iodide in a rapidly urbanized delta: A case study of the Pearl River Delta

Cited by 48 publications

References 40 publications

Groundwater Quality in Agricultural Lands Near a Rapidly Urbanized Area, South China

Groundwater Quality in Agricultural Lands Near a Rapidly Urbanized Area, South China

Investigation of Groundwater Contamination and Health Implications in a Typical Semiarid Basin of North China

Natural background levels and driving factors of aluminum in shallow groundwater of an urbanized delta: Insight from eliminating anthropogenic‐impacted groundwaters

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