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The second component (PC2) explaining 20.68% of the total variance, have a strong positive loading of temperature; moderate positive loadings of TDS and Fe and weak loadings of EC.
VF2 explaining 23.3% of the total variance had strong positive loading on F, HCO3 and SO4; and moderate positive loadings on EC, TDS and Mg.
Component 2 explains approximately 14.67% of the total variance (Table 8) and has moderate negative loadings for HCO3 −, pH; moderate positive loadings for NO3 N and Mn and a strong negative loading for SiO2 (Table 7) reflecting a natural source (silicate/aluminosilicate weathering by carbon-dioxide charged water) and anthropogenic source (use of inorganic fertilizer in agricultural activities).
Factor 1 explains 29.49 % of the total variance and has strong positive loadings on EC, Na+, Ca2+, Mg2+ and HCO3 −, moderate positive loadings on Cl− and K+.
For the data set representing cluster 2, among the three VFs, VF1, which explained 46.3% of the total variance had strong positive loadings on Ca, Cl, TDS, EC and TH; and moderate positive loadings on Mg and HCO3.
Component 3 explains approximately 8.47% of the total variance (Table 8) and has moderate positive loadings for Pb and Fe; moderate negative loadings for Cu and Zn and weak positive loadings for Hg and Se (Table 7).
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VF3 explaining 17.1% of the total variance had strong positive loadings on HCO3 and F, moderate positive loading on Na and moderate negative loading on SO4.
On the second principal component, Fe and NO3− concentrations have high positive loadings (0.867 0.903), and the concentration of Mg2+ shows moderate positive loading (0.576).
For the data set pertaining to cluster 1, VF1, which explained 47.4% of the total variance had strong positive loadings on Ca, Mg, TDS, EC and TH and moderate positive loading on Na.
The concentrations of EC, TDS, TA, TH, Na+, K+, Ca and HCO3− show high loadings (0.743 0.959), and the concentration of Cl− has moderate positive loading (0.616) on the first principal component.
The first component (PC1) accounted for 49.14% of total variance and includes strong positive loadings of pH, turbidity, alkalinity, total hardness, colour, calcium hardness, magnesium hardness, Mg2+, Ca2+, SO42−, CO32−, HCO32− and total CO2; and moderate positive load of TDS, EC, free CO2 and Fe.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com