Effect of Anionic-Nonionic Mixed Surfactants on Uptake of Organochlorine Pesticides from Soil by Alfalfa
Abstract: The uptake of organochlorine pesticides (OCPs) by alfalfa in the presence of anionic-nonionic mixed surfactants SDBS-TX100 & SDBS-TW80 was studied in soils by pot experiment in a greenhouse. The results show that SDBS-TX100 & SDBS-TW80 mixtures with mass ratios of 0:10, 1:9, 5:5, and 9:1 could enhance the uptake of OCPs by alfalfa with the total concentration of 50 - 1000 mg•L−1, ac-cording to that the removal efficiency of OCPs keeps in 50% & 45% and more by alfalfa in soil. The mixed surfactants enhanced uptake of OCPs by alfalfa was closely related to the mixed surfactant form, as well as the ratio and concentration. The SDBS-TX100 mixture with a mass ratio of SDBS to TX100 at 1:9 had the greatest capacity in enhancing the uptake of OCPs, and no harm to plant growth. The SDBS-TW80 which concentration in 50 - 300 mg•L−1 promoted alfalfa’s absorption and had no harm to plant. In the research, SDBS-TX100’s performance is better than the SDBS-TW80.
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