Discussion on the Fluorosis in Seawater-Intrusion Areas Along Coastal Zones in Laizhou Bay and Other Parts of China

Chen, Q.; Wei, Jiuchuan; Wang, H.; Shi, Longqing; Gao, Zongjun; Liu, S.; Fangzhu, Ning; Jia, Cuiping; Ji, Yongming; Dong, Feifei; Jia, Zhiwen

doi:10.1007/s41742-019-00177-w

Cited by 14 publications

(16 citation statements)

References 17 publications

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“…Since the phenomenon of seawater intrusion such as salty water quality and increased Cl − concentration was found in Shouguang, Hanting, Laizhou, and other regions in 1970s, Laizhou Bay has become a key area for the study of seawater intrusion in China. In recent years, many scholars have studied the seawater intrusion in Laizhou Bay; for example, the authors of [22] investigated the seawater intrusion of the southern coast of Laizhou Bay and found that the degree of saline water intrusion in Holocene groundwater is more serious than that in Late Pleistocene groundwater; the authors of [23] studied the fluorine in the groundwater of southern coast of Laizhou Bay and suggested that the seawater intrusion led to the release of more F into the groundwater from rocks and soil; the authors of [24] applied H, O, and Li isotopes to study the groundwater of the southern coast of Laizhou Bay and suggest that shallow saline groundwater originated from brine diluted with seawater and fresh groundwater, and deep saline groundwater originated from seawater intrusion. The influence of groundwater on agricultural cultivation has also been widely concerned by scholars.…”

Section: Introductionmentioning

confidence: 99%

Hydrochemical Characteristics and Irrigation Suitability Evaluation of Groundwater with Different Degrees of Seawater Intrusion

Wang

Liu

et al. 2020

Water

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Groundwater in coastal aquifers is often affected by seawater intrusion, resulting in water quality deterioration. Using groundwater influenced by seawater intrusion for irrigation can lead to crop failure, erosion of machinery and pipes, and adverse effects on farming. In this study, the results of water testing, methods of statistical analysis, ion ratios, a Piper diagram, and a variety of groundwater irrigation suitability models were used to analyze the chemical composition of groundwater and the influence of seawater intrusion. The result shows that the content of Na+, K+, Ca2+, Mg2+, Cl−, and SO42− in groundwater would increase due to seawater intrusion, and the increasing trend was consistent with the freshwater–seawater mixing line. With the deepening of seawater intrusion, the hydrochemical type gradually changes from Ca-HCO3·Cl to Na·Mg-Cl·SO4 and then to Na-Cl type, and the source of hydrochemical composition changes from “Rock Weathering Dominance” to “Evaporation Dominance”. When the Cl− concentration is greater than 7.1 meq/L, groundwater will corrode pipelines and instruments; when greater than 28.2 meq/L, excessively high salinity of groundwater will have adverse effects on planting; and when greater than 14.1 meq/L, the groundwater hardness is too high, which may make the groundwater unsuitable for cultivation.

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Section: Introductionmentioning

confidence: 99%

Hydrochemical Characteristics and Irrigation Suitability Evaluation of Groundwater with Different Degrees of Seawater Intrusion

Wang

Liu

et al. 2020

Water

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“…The geochemical characteristics of high Na þ and low Ca 2þ can greatly promote fluoride-leaching from soil or rock because of the following reasons: First, the Na-F combination is prior to Ca-F or Mg-F combination. Second, the NaF solubility is remarkably higher than CaF 2 or MgF 2 (Chae et al 2007;Chen et al 2012Chen et al , 2019Chen et al , 2020b. Meanwhile, the fluoride levels in groundwater are restricted by Ca 2þ levels because of the low CaF 2 solubility, and Ca 2þ -F À negative relationship in groundwater is commonly observed and documented (Ozsvath 2009;Wang et al 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Multiply researchers have stated high fluoride groundwater is strongly associated with alkaline and soft environments, which are enriched in Na þ and depleted in Ca 2þ (Ozsvath 2009;Wang et al 2015;Chen et al 2019). Although there are no direct proofs detailing the effect of seawater intrusion on groundwater fluoride levels yet, the salt intrusion, which is similar to seawater intrusion, has been documented to be the important dynamic to improve the fluoride leaching and evaluate groundwater fluoride levels in Nagar Parker, Sindh province of Pakistan (Tahir et al 2009) and Yuncheng, Shanxi province of China (Gao et al 2007) by field investigation and indoor experiments.…”

Section: Discussionmentioning

confidence: 99%

Fluoride-leaching simulation of aquifer sediment and its influence on groundwater fluoride levels along coastal plains

Jia

Chen

et al. 2022

Water Supply

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Seawater intrusion and drinking-water fluorosis are frequently documented along coastal plains. Groundwater is characterized by high OH−, Na+, total dissolved solids, and low Ca2+ because of seawater intrusion, and such conditions favor sediment fluoride-leaching and fluorosis. But the geological process of seawater intrusion has not been noticed when high-fluoride groundwater along coastal areas is discussed. The groundwater and sediments in a typical seawater intrusion and fluorosis area are gained, and fluoride-leaching simulation experiments are performed. Sediment fluoride levels are equal to or lower than average sediment fluoride levels in China and Shandong province, but strong fluoride-leaching in aquifers is observed. Compared with the supplied water from the non-intruded neighboring area, the local groundwater has higher fluoride levels, together with higher pH, total dissolved solids, HCO3−, Cl−, Br−, SO42−, Na+, K+, and low Ca2+ because of seawater intrusion. Aquifer sediment fluoride-leaching ability increases with an increase in seawater (brine water) mixing ratios, and NaCl or NaHCO3 levels, but with a decrease in CaCl2 levels. This directly confirms that seawater (brine water) intrusion promotes sediment fluoride-leaching, and the high pH, Na+, HCO3−, and low Ca2+ levels caused by seawater intrusion are responsible for the high-fluoride groundwater along coastal plains.

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“…Seawater intrusion, a common process along coastal zones, can potentially change groundwater Se levels by altering groundwater properties. For example, the groundwater becomes alkaline due to seawater intrusion, with the high pH of more than 7.0 (Qi and Qiu, 2011;Ma et al, 2013;Chen et al, 2019), multiple researches documented the Se 2and Se 0 transformation into Se 4+ and Se 6+ . Accordingly, the groundwater Se levels should be elevated with the intrusion of seawater (Frost and Griffin, 1977;Bailey, 2017).…”

Section: Short Communicationsmentioning

confidence: 99%

Groundwater Selenium Level and its Enrichment Dynamics in Seawater Intrusion Area along the Northern Coastal Zones of Shandong Province, China

et al. 2019

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The variation of groundwater properties caused by seawater intrusion, such as OH-, TDS, can potentially affect the groundwater Se levels. But there are no researches detailing the mechanism of groundwater selenium characteristics in seawater intrusion areas along coastal zones. Buzhuang town has been selected for study and groundwater is sampled to discuss the behavior of groundwater selenium with the intrusion of seawater. The groundwater Se levels range from 1.43 to 15.60 μg/L, with an average of 6.23 μg/L. All are within the limit of 10 μg/L except Wanglu village, but the local groundwater Se levels in 8 villages exceed the chronic criterion of 5 μg/L, and the Se levels in local groundwater are higher than those in the supplied water which has a non-seawater source. The groundwater Se levels have been shown to be elevated by seawater intrusion. The groundwater Se levels are positively correlated with Cl-, TDS, Br-, Na + , Mg 2+ , Ca 2+ and Fe and negatively correlated with pH. Ion competition effects and the Na-Mg-sulfate minerals play an important role in the adsorption and desorption for and , which are the important dynamic species for groundwater selenium enrichment. However, Ca and Fe ions have less contribution to groundwater Se variation because of the lower affinity for and and lesser content in groundwater of seawater intrusion areas.

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Discussion on the Fluorosis in Seawater-Intrusion Areas Along Coastal Zones in Laizhou Bay and Other Parts of China

Cited by 14 publications

References 17 publications

Hydrochemical Characteristics and Irrigation Suitability Evaluation of Groundwater with Different Degrees of Seawater Intrusion

Hydrochemical Characteristics and Irrigation Suitability Evaluation of Groundwater with Different Degrees of Seawater Intrusion

Fluoride-leaching simulation of aquifer sediment and its influence on groundwater fluoride levels along coastal plains

Groundwater Selenium Level and its Enrichment Dynamics in Seawater Intrusion Area along the Northern Coastal Zones of Shandong Province, China

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