Competitive Adsorption Mechanism Of Heavy Metals And Pesticides In Sediments Based On The Fractional Factorial (ResolutionV)

In order to reveal the combined pollution characteristic in pesticide (dimethoate, metalaxyl, atrazine, malathion, prometryn)/heavy metals (Cu, Zn, Pb, Cd, Ni) composite contamination system, we choice the resolution of the 210-3 V fractional factorial design method, combination of a fixed effects model, multiple linear regression model, and the best subset regression modeling methods. On this basis, the impact of the target pollutant factor adsorbed on sediment affected by the main effects and interactions of these ten pollution factors have been researched.The study found that, in the ten pollutants system, the main effect of pollutants on the adsorption of Cd in sediments play a leading role. According to the effect of the value, Cu>Pb>Zn>dimethoate. The concentration of Cd has a significant synergistic effect, the other four showed a significant antagonism effect. Second-order interaction effect adsorption of Cd in sediments have unconspicuous second-order interactions significantly affect factors and including Cu * Zn (synergy), Ni * Zn (antagonism). In addition, second-order interaction impact of Ni adsorption relatively significant contribution rate of 62%, a significant second-order interaction fourteen groups, including the most significant synergies atrazine * Cd=1.8947, the most significant antagonism is dimethoate * atrazine=0.8179. According to the value of the size of the effect, on the adsorption of Ni target pollutants in sediments have a significant main effect factors were significantly affected Ni, metalaxyl, Pb, Cd, Zn, Cu, Ni and metalaxyl which has significant synergies, the other four heavy metal pollutants are a significant antagonism. In conclusion, the main effect of metal contaminants has played a significant antagonism.The study also found that, based on the value of the effect on the target contaminants metalaxyl adsorbed on sediments, the main effect factors which have significant impact in the order of metalaxyl and Cu. Metalaxyl has significant synergistic effects of Pb and Cu shows significant antagonism. Metalaxyl adsorbed on sediments have a significant impact on the target contaminants second-order interaction contribution rate of 79%, indicating that the second-order interactions in the sediment for metalaxyl adsorption has a leading role, in which the most significant synergies from atrazine * Cd=0.10969, the most significant antagonism is derived from dimethoate * metalaxyl=-0.15383; second-order interactions on target pollution prometryne matter adsorbed on sediments also have a significant impact on the contribution rate of 70.9 percent, second-order factor interactions fifteen groups, from which the most significant synergies in atrazine * Pb, the contribution rate 5.3 percent, the most significant antagonism is derived from dimethoate * Cd, the contribution rate of 4.9%. Factor main effects of heavy metals, except Zn, the other main effects are more or less the net adsorbed on sediments have a significant effect on flutter grass, which is in addition to the Cu itself prometryne net synergies of adsorption on sediments prometryne the most significant, number of effect is 0.15.