Stock solutions prepared with analytical grade
CdCl2.2.5H2O and ZnSO4.7H2O were added into
distilled water to be diluted. The plants were placed in
solutions containing 0.5, 2, 4 mg/L of Cd and 5, 20, 40
mg/L of Zn. One control group of plants was also
prepared where no metal ion were added. Before
immersing the plants in the metal solutions, their
weights were recorded. Test durations were two hours,
4, 8 and 12 days. After each exposure duration, the
plants were harvested. Their weights were taken again
to measure their relative growths.