A preliminary investigation of lithogenic and anthropogenic influence over fluoride ion chemistry in the groundwater of the southern coastal city, Tamilnadu, India

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• 作者：S. Selvam
• 关键词：Tuticorin ; Ion chromatography ; Anthropogenic ; Linear trend analysis ; Fluoride minerals ; PRM and POM
• 刊名：Environmental Monitoring and Assessment
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：187
• 期：3
• 全文大小：3,154 KB
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• 作者单位：S. Selvam (1)
  
  1. Department of Geology, V.O.Chidambaram College, Tuticorin, 628008, India
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Ecology
  Atmospheric Protection, Air Quality Control and Air Pollution
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-2959

文摘

A total of 72 groundwater samples were collected from open wells and boreholes during pre- and post-monsoon periods?in Tuticorin. Samples were analyzed for physicochemical properties, major cations, and anions in the laboratory using the standard methods given by the American Public Health Association. The fluoride concentration was analyzed in the laboratory using Metrohm 861 advanced compact ion chromatography. The geographic information system-based spatial distribution map of different major elements has been prepared using ArcGIS 9.3. The fluoride concentration ranges between 0.16?mg/l and 4.8?mg/l during pre-monsoon and 0.2-.2?mg/l during post-monsoon. Alkaline pH, low calcium concentrations, high groundwater temperatures, and semiarid climatic conditions of the study area may cause elevated fluoride concentrations in groundwater, by increasing the solubility of fluoride-bearing formations (fluoride). Linear trend analysis on seasonal and annual basis clearly depicted that fluoride pollution in the study area is increasing significantly. Fluoride concentrations showed positive correlations with those of Na+ and HCO3 ?/sup> and negative correlations with Ca2+ and Mg2+. The alkaline waters were saturated with calcite in spite of the low Ca2+ concentrations. Northwestern parts of the study area are inherently enriched with fluorides threatening several ecosystems. The saturation index indicates that dissolution and precipitation contribute fluoride dissolution along with mixing apart from anthropogenic activities.