Research Article
Assessment of Groundwater Quality along the Cooum River, Chennai, Tamil Nadu, India
Table 5
Statistics of three years (2009–2011) groundwater quality data—premonsoon.
| Premonsoon | Parameter | Year | pH | EC (μS/cm) | TDS (mg/L) | BOD (mg/L) | COD (mg/L) | Na (mg/L) | Pb (mg/L) |
| | 2009 | 8.31 | 2173 | 2677 | 8.34 | 24.2 | 287 | 0.081 | Max | 2010 | 8.26 | 2296 | 2713 | 8.35 | 24.6 | 303 | 0.083 | | 2011 | 8.3 | 2371 | 2892 | 8.56 | 24.8 | 313 | 0.087 |
| | 2009 | 6.85 | 498 | 987 | 4.39 | 13.3 | 130 | 0.025 | Min | 2010 | 6.71 | 631 | 1048 | 4.24 | 11.1 | 137 | 0.03 | | 2011 | 7.04 | 583 | 1010 | 4.64 | 11.8 | 150 | 0.036 |
| | 2009 | 7.51 | 1355 | 1894.15 | 6.8135 | 18.73 | 219.75 | 0.0585 | Mean | 2010 | 7.4185 | 1515.95 | 2029 | 6.74 | 18.755 | 226.55 | 0.055 | | 2011 | 7.548 | 1523.75 | 2073.5 | 6.8995 | 19.72 | 230 | 0.0642 |
| | 2009 | 0.41391 | 570.724 | 575.614 | 1.27868 | 3.4278 | 53.18 | 0.01494 | Std. | 2010 | 0.44131 | 536.77 | 577.915 | 1.37405 | 4.0111 | 55.006 | 0.014567 | | 2011 | 0.36026 | 559.887 | 585.852 | 1.34849 | 3.9107 | 57.544 | 0.014468 |
| | 2009 | 5.51145 | 42.11985 | 30.38904 | 18.76686 | 18.30112 | 24.20023 | 25.53846 | CV% | 2010 | 5.9487 | 35.40816 | 28.48275 | 20.3865 | 21.38683 | 25.40013 | 26.48545 | | 2011 | 4.7729 | 36.74402 | 28.25426 | 19.54475 | 19.83114 | 25.01913 | 22.53583 |
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