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Table 4 Statistical analysis of the ion concentration in water around the study area, Dinajpur

From: An application of Water Quality Index (WQI) and multivariate statistics to evaluate the water quality around Maddhapara Granite Mining Industrial Area, Dinajpur, Bangladesh

Ions Min. Max. Mean Median Std. deviation Variance WHO (2011)
Ca2+ 1.3 55 15.06 10 14.01 196.4 75
Mg2+ 1 41 10.56 5.75 10.16 103.24 50
Na+ 2.1 53 14.34 13.8 10.58 111.97
K+ 0.4 12.2 3.1 2.7 2.53 6.41 10
Fe3+ 0.09 0.92 0.34 0.24 0.23 0.05
As3+ 0 0.0017 0.001 0.0011 0.0005 0 <0.01
Cd2+ 0.0008 0.0042 0.002 0.002 0.001 0 0.05
Zn2+ 0.08 0.32 0.15 0.13 0.06 0 3
Cr3+ 0 0.015 0.0023 0.002 0.003 0.002 <0.05
\({\text{SO}}_{4}^{2 + }\) 0.08 10 0.86 0.34 1.86 3.44 250
\({\text{PO}}_{4}^{3 - }\) 0.08 2.3 0.48 0.34 0.5 0.25 2.5
\({\text{HCO}}_{3}^{{ - }}\) 5 87.5 28.31 19 20.94 438.51 500
\({\text{NO}}_{3}^{{ - }}\) 0.07 0.71 0.35 0.33 0.16 0.03 45
Cl 0.71 73.84 9.79 4.26 14.4 207.48 250
\({\text{NH}}_{4}^{ + }\) 0.22 1.07 0.7 0.7 0.24 0.06 35
\({\text{CO}}_{{3}}^{{2 - }}\) 4.3 18 9.35 8.95 3 9.03