A linear regression model （LRM） for groundwater chemistry in and around the Vaniyambadi industrial area, Tamil Nadu, India

• Published in: 中国地球化学学报：英文版 2013 (1), p.19-26
• Main Author: Sajil Kumar p.j. Davis Delson p. Vernon J.G. James E.J
• Format: Article
• Language: English
• Subjects: LRM; 印度; 地下水化学; 工业区; 物理化学参数; 研究区域; 线性回归模型; 聚类分析
• ISSN: 1000-9426; 1993-0364

A linear regression model in conjunction with cluster analysis was applied to the groundwater quality parameters for the Vaniyambadi industrial area, Tamil Nadu, India. These physico-chemical parameters were col- lected from 25 wells by intensive groundwater sampling conducted during January 2010. All the major ions, pH and electrical conductivity were analyzed. The abundances of cations were in the order of Na 〈Ca 〈Mg 〈K and those of anions were in the order of C1 〈HCO3 〈SO4 〈CO3, respectively. This was in agreement with the water types, Na-Cl and Na-Ca-HCO3, determined by the Piper plot. High concentrations of the ions Na, Cl and SO4 were recorded near the tanneries that operate within the study area. While the elevated concentrations of HCO3 and F were observed away from the tanneries. This peculiar hydrochemical behaviour suggests that the chemistry of water is predominantly influenced by tannery effluents and weathering of silicate minerals. Results of the linear regression model yielded 11 regression equations for the 5 most correlated parameters. A dendrogram from the cluster analysis showed 2 major clusters representing the influence of tanneries and geological formations in the study area, which confirmed the results of major ion chemistry.