| Popis: |
Fifty pre-monsoon groundwater samples from the Cuttack district of India have been analyzed by correlation, factor, cluster and multiple regression analyses for understanding the controlling processes which influence the groundwater chemistry. Five factors have been extracted from the data set out of which first three factors, accounting for 65.76% of variance are strongly loaded on TDS, TA, TH, Ca2+, Mg2+, Na+, Fe2+, Cl−, HCO3−, SO42− and NO3−. The phenom line at 0.60 level brings out three clusters comprising TDS-TH-Ca2+-Mg2+-HCO3−, Na+-Cl− and pH-TA. Multiple regression analysis indicates the significant contribution of Ca2+, Mg2+, Na+, Cl−, HCO3−, SO42− and NO3− to the total dissolved solid (TDS). All the three multivariate techniques, in conjunction, suggest that the groundwater chemistry is mostly controlled by Ca2+, Mg2+, Na+, HCO3− and Cl− and the dominant groundwater facies are Ca-HCO3, Mg-HCO3 and Na-Cl. The chemical constituents of the groundwater are derived from weathering of feldspars, pyroxenes, amphiboles, micas and apatite as well as from domestic wastes, leakage from septic tanks and agricultural fertilizers. |
