Fig. 5. Cadmium, zinc, and copper species distribution as a function of background NaNO3, Na2SO4, or NaCl ionic strength, calculated using MINTEQA2 at pH 7.0 and 10 mmol L-1 M2+, and effect of pH on 10 mmol L-1 Cd2+, Cu2+, and Zn2+ in 0.03 M NaCl.