Research Article
Assessment of Groundwater Quality along the Cooum River, Chennai, Tamil Nadu, India
Table 7
Correlation coefficient (
) for different water quality parameters—premonsoon.
| Parameter | pH | EC | TDS | BOD | COD | Na | Pb |
| 2009 premonsoon |
| pH | 1 | | | | | | | EC | 0.251 | 1 | | | | | | TDS | 0.331 | 0.96 | 1 | | | | | BOD | 0.217 | 0.831 | 0.785 | 1 | | | | COD | 0.226 | 0.867 | 0.884 | 0.668 | 1 | | | Na | 0.449 | 0.926 | 0.895 | 0.878 | 0.768 | 1 | | Pb | 0.103 | 0.761 | 0.819 | 0.829 | 0.709 | 0.821 | 1 |
| 2010 premonsoon |
| pH | 1 | | | | | | | EC | 0.437 | 1 | | | | | | TDS | 0.447 | 0.896 | 1 | | | | | BOD | 0.192 | 0.782 | 0.900 | 1 | | | | COD | 0.442 | 0.911 | 0.863 | 0.762 | 1 | | | Na | 0.238 | 0.811 | 0.941 | 0.932 | 0.731 | 1 | | Pb | 0.420 | 0.846 | 0.816 | 0.758 | 0.835 | 0.750 | 1 |
| 2011 premonsoon |
| pH | 1 | | | | | | | EC | 0.191 | 1 | | | | | | TDS | 0.352 | 0.950 | 1 | | | | | BOD | 0.185 | 0.876 | 0.859 | 1 | | | | COD | 0.229 | 0.896 | 0.873 | 0.764 | 1 | | | Na | 0.370 | 0.896 | 0.947 | 0.888 | 0.767 | 1 | | Pb | 0.186 | 0.856 | 0.855 | 0.694 | 0.874 | 0.766 | 1 |
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