Joint toxicity of methamidophos and cadmium acting on Abelmoschus manihot
WANG Xiao-fei , ZHOU Qi-xing
DOI:
Received August 30, 2004,Revised October 24, 2004, Accepted , Available online
Volume 17,2005,Pages 379-383
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Joint toxicity of methamidophos and cadmium(Cd) on the ornamental Abelmoschus manihot was firstly examined and compared with single-factor effects of the two pollutants using ecotoxicological indexes including the inhibitory rate of seed germination, root elongation and inhibitory concentration 50% (IC50). The results indicated that methamidophos and Cd had unobvious( p ＞ 0.05) effects on seed germination of the ornamental. There were significant( p ＜ 0.05) inhibitory effects of Cd on root elongation of the tested plant. When the concentration of added Cd was low( ＜ 20 mg/L), significant antagonistic effects on root elongation were observed. And synergic effects were observed when Cd was added in high dose( ＞ 20 mg/L). However, the analysis of joint effects indicated that there were antagonistic effects between Cd and methamidophos under all the treatments. At the high concentration of Cd, joint toxicity of methamidophos and Cd was more dependent on concentration of Cd.
