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Effects of Surfactant on the Environment Behavior of Two Organophosphorus Pesticide in Soils

Author: LiuZuoSi
Tutor: LiuHongYu
School: Hunan University
Course: Environmental Engineering
Keywords: Surfactant Chlorpyrifos Diazinon Solubilization Adsorption Migrate Soil
CLC: X592
Type: Master's thesis
Year: 2009
Downloads: 80
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Abstract


Five surfactant (TW80, TX100, TW20, SDBS, SDS) solubilization of solubilization effect of chlorpyrifos and diazinon , and overcast - nonionic mixed surfactant and inorganic electrolytes added . The results show that the five kinds of surface - active agents are able to a certain extent, to improve the apparent solubility in the aqueous solution of chlorpyrifos and diazinon , the solubilization ability of the non - ionic surface active agent of Chlorpyrifos significantly greater than the anionic surface active agent , shows a good increase The solution eluting prospects . Mixed solubilizing experiments show that in the TX-100 concentration in certain circumstances , the added anionic surfactant SDBS enables chlorpyrifos solubilizing effect is more obvious , TX-100 at a concentration of 500mg / L , 1:3 ratio the degree of solubilization of mixed surfactant reached the single surfactant 342.3% . Four kinds of inorganic electrolytes ( NaCl , KCl, of CaCl 2 < / sub > the MgCl 2 < / sub > ) SDBS solution chlorpyrifos solubilization of the same proper ratio of SDBS- inorganic the electrolyte system can effectively improve the efficiency of the use of a surface active agent and reduce costs. Batch equilibrium method and thin layer chromatography , were studied three kinds of different concentrations of surfactant (SDBS, W80 and TW80) 6 Otsuchi class representative of diazinon in Hunan Province , nine different parent material soil adsorption and migration performance . The results showed that of SDBS able to significantly reduce the variety of soil adsorption of diazinon , promoting the migration of diazinon role and adsorption equilibrium coefficient ( K d < / sub> ) , Rf value (R f ) , respectively, with the concentration of SDBS into significantly with the negative relevant and positive correlation between TW80 and CTAB diazinon in the soil adsorption and migration of the performance of a certain similarity , TW80 concentration at 0.1 times the critical micelle concentration to within the range of 2 times the critical micelle concentration (CTAB concentrations of 0.80 to 87.43 mg · L -1 < / sup >) , and the Kd value and Rf value with the concentration of surface active agent , respectively, into a positive correlation , and negative correlation , while TW80 within the concentration range of 2 times the critical micelle concentration to 5 times the critical micelle concentration (CTAB concentration of 87.43 to 191.60 mg · L -1 < / sup >. ) appears contrary trends .

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