Research Article
Assessment of Groundwater Quality along the Cooum River, Chennai, Tamil Nadu, India
Table 8
Correlation coefficient (
) for different water quality parameters—postmonsoon.
| Parameter | pH | EC | TDS | BOD | COD | Na | Pb |
| 2009 postmonsoon |
| pH | 1 | | | | | | | EC | 0.3 | 1 | | | | | | TDS | 0.412 | 0.975 | 1 | | | | | BOD | 0.348 | 0.88 | 0.899 | 1 | | | | COD | 0.182 | 0.935 | 0.89 | 0.811 | 1 | | | Na | 0.399 | 0.915 | 0.948 | 0.909 | 0.808 | 1 | | Pb | 0.084 | 0.832 | 0.78 | 0.676 | 0.827 | 0.748 | 1 |
| 2010 postmonsoon |
| pH | 1 | | | | | | | EC | 0.363 | 1 | | | | | | TDS | 0.445 | 0.972 | 1 | | | | | BOD | 0.405 | 0.884 | 0.921 | 1 | | | | COD | 0.244 | 0.933 | 0.893 | 0.829 | 1 | | | Na | 0.333 | 0.846 | 0.886 | 0.809 | 0.762 | 1 | | Pb | 0.186 | 0.849 | 0.808 | 0.747 | 0.857 | 0.781 | 1 |
| 2011 postmonsoon |
| pH | 1 | | | | | | | EC | 0.392 | 1 | | | | | | TDS | 0.325 | 0.974 | 1 | | | | | BOD | 0.310 | 0.914 | 0.892 | 1 | | | | COD | 0.164 | 0.895 | 0.935 | 0.812 | 1 | | | Na | 0.363 | 0.879 | 0.843 | 0.818 | 0.730 | 1 | | Pb | 0.167 | 0.821 | 0.846 | 0.723 | 0.853 | 0.734 | 1 |
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