Abstract
Nitrate pollution is a serious groundwater problem, a statistical index called Normalized Difference Dispersal Index (NDDI) and nonparametric spatial statistical model have been used for appraisal of groundwater samples. The groundwater monitoring data of period (2005–2013) of Kanchipuram district of state Tamil Nadu, country India has been used in this study. Maximum NDDI value enrichment is exhibited by NO3- (+ 1.0) at many locations in studied period and it shows absolute accretion (increment of NO3-) and at few locations NO3- (− 1.0) shows its absolute dilution (decrement of NO3-). Mean index values of NO3- are + 0.01, − 0.20, − 0.19, − 0.09, − 0.11, 0.00, − 0.04 and − 0.17, respectively in year 2006, 2007, 2008, 2009, 2010, 2011, 2012 and 2013. In order to quantify the site-specific variations through index, map of NO3- a environmentally sensitive species was generated by ArcGIS ver. 10. Statistical index based mapping is an appraisal method for evaluation and comparative assessment of NO3- ion at different sites. The elevated index values shows that the sampling locations are not safe for consumptive use. This statistical index has potential to identify the ion specific risk zones.
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