{"title":"Effect of clayey sediment compression on fluoride enrichment in the Quaternary groundwater system of Cangzhou Plain, China","authors":"Rui Liu, Haipeng Guo, Juan Chen, Haigang Wang, Xisheng Zang, Guijie Wang, Yunlong Wang, Juyan Zhu","doi":"10.1016/j.jhazmat.2024.136022","DOIUrl":null,"url":null,"abstract":"The effect of clay layer compression on the enrichment of groundwater fluoride remains unknown. Quaternary groundwater with high fluoride levels at the Cangzhou Plain, which has a long history of land subsidence caused by clay layer compression, poses a potential health risk. The spatial distribution and enrichment mechanisms of groundwater fluoride are identified by sample collection, hydrochemical analysis, and geochemical inverse modeling. The results revealed that fluoride concentrations in 82% of the 122 groundwater samples above the limit in drinking water as 1.0<!-- --> <!-- -->mg/L in China. Fluoride in shallow groundwater (depth <span><span><math><mo is=\"true\"><</mo><mspace is=\"true\" width=\"1em\"></mspace></math></span><script type=\"math/mml\"><math><mo is=\"true\"><</mo><mspace width=\"1em\" is=\"true\"></mspace></math></script></span>20<!-- --> <!-- --> m, ~average = 2.08<!-- --> <!-- -->mg/L) was mainly originated from fluorite dissolution and influenced by groundwater <span><span><math><mtext is=\"true\">HC</mtext><msubsup is=\"true\"><mrow is=\"true\"><mtext is=\"true\">O</mtext></mrow><mrow is=\"true\"><mn is=\"true\">3</mn></mrow><mrow is=\"true\"><mo is=\"true\">−</mo></mrow></msubsup></math></span><script type=\"math/mml\"><math><mtext is=\"true\">HC</mtext><msubsup is=\"true\"><mrow is=\"true\"><mtext is=\"true\">O</mtext></mrow><mrow is=\"true\"><mn is=\"true\">3</mn></mrow><mrow is=\"true\"><mo is=\"true\">−</mo></mrow></msubsup></math></script></span>, pH, and cation exchange levels. Below ~200<!-- --> <!-- -->m, the main source of groundwater fluoride (~average = 3.12<!-- --> <!-- -->mg/L) was the compression−release of clay pore water with high F<sup>−</sup> concentration, which was generated by complex water-rock interaction. Based on hydrochemical inverse simulation and end-member mixing models, the pore water released from clayey sediments supplied 53%−56% of deep groundwater (>200<!-- --> <!-- -->m) and contributed 2.07−2.87<!-- --> <!-- -->mg/L to F<sup>−</sup> concentration. The findings of this study provide a theoretical basis for future research on prevention of high fluoride groundwater induced by clayey sediment compression.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":null,"pages":null},"PeriodicalIF":12.2000,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Hazardous Materials","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1016/j.jhazmat.2024.136022","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
The effect of clay layer compression on the enrichment of groundwater fluoride remains unknown. Quaternary groundwater with high fluoride levels at the Cangzhou Plain, which has a long history of land subsidence caused by clay layer compression, poses a potential health risk. The spatial distribution and enrichment mechanisms of groundwater fluoride are identified by sample collection, hydrochemical analysis, and geochemical inverse modeling. The results revealed that fluoride concentrations in 82% of the 122 groundwater samples above the limit in drinking water as 1.0 mg/L in China. Fluoride in shallow groundwater (depth 20 m, ~average = 2.08 mg/L) was mainly originated from fluorite dissolution and influenced by groundwater , pH, and cation exchange levels. Below ~200 m, the main source of groundwater fluoride (~average = 3.12 mg/L) was the compression−release of clay pore water with high F− concentration, which was generated by complex water-rock interaction. Based on hydrochemical inverse simulation and end-member mixing models, the pore water released from clayey sediments supplied 53%−56% of deep groundwater (>200 m) and contributed 2.07−2.87 mg/L to F− concentration. The findings of this study provide a theoretical basis for future research on prevention of high fluoride groundwater induced by clayey sediment compression.
期刊介绍:
The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.