Table 4. Different Ion Concentration–Conductivity Curves^a.

species	curve	R2
Cu2+	y = 0.5414x – 9.9073	0.9994
Pb2+	y = 1.0829x – 9.4815	0.9947
Cd2+	y = 0.6702x – 7.1321	0.9992
Ag+	y = 0.5247x – 5.7204	0.9991
Fe3+	y = 0.4129x – 12.7221	0.9995

^ax is the solution conductivity value, μS/cm; and y is the solution ion concentration value, mg/L.