variable	Ca²⁺	Mg²⁺	Na⁺ + K⁺	${HCO}_{3}^{-}$	${SO}_{4}^{2 -}$	Cl⁻	PH	TDS
Ca²⁺	1	0.704	−0.151	−0.429	0.405	0.264	−0.368	−0.097
Mg²⁺	0.704	1	−0.120	−0.405	0.404	0.308	−0.363	−0.054
Na⁺ + K⁺	−0.151	−0.120	1	0.819	−0.025	0.736	−0.304	0.952
${HCO}_{3}^{-}$	−0.429	−0.405	0.819	1	−0.348	0.277	−0.115	0.786
${SO}_{4}^{2 -}$	0.405	0.404	−0.025	−0.348	1	0.062	−0.097	0.040
Cl⁻	0.264	0.308	0.736	0.277	0.062	1	−0.444	0.684
PH	−0.368	−0.363	−0.304	−0.115	−0.097	−0.444	1	−0.343
TDS	−0.097	−0.054	0.952	0.786	0.040	0.684	−0.343	1