Fitotoxicological examination of some metals causing environmental pollution

Written by Kincses-Ajtay Mária, Fülöp Ibolya, Croitoru Mircea Dumitru

Because of human activities, metals with toxic effect upon the environment could appear in the circulation of ecosystems. The aim of this paper was to investigate the fitotoxicological effect of some transitional metals. We studied the longitudinal growth of wheat germ (Triticum vulgare) in the presence of Fe, Mn, Pb, Cr and Hg, using solutions of their salts: ferric chloride (FeCl3), lead nitrate (Pb(NO3)2), mercuric chloride (HgCl2), cadmium nitrate (Cd(NO3)2), manganese sulfate(MnSO4), potassium dichromate (K2Cr2O7). The concentration of the solutions of these salts was gradually increased: 3 mg/l, 6 mg/l, 10 mg/l, 20 mg/l, 25 mg/l, 50 mg/l, 80 mg/l, and 100 mg/l. We measured the growth of the wheat germ every 24 hours for 7 days. The results showed that each one of these metals hindered the growth of the plants. The rate of the inhibition depends on the concentration. A significant decrease can be noticed over 6 mg/l in case of each one of the examined salts.

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