Experimental Study on Effect of Anion Surfactant on Degradation Rate of Aldicarb in Soil

Abstract

Degradation kinetics of aldicarb [2-methyl-2-(methylthio) propionaldehyde O-(methyl carbamoyl) oxime] in surface and subsurface soil containing different levels of sodium dodecylbenzenesulfonate (SDBS) were determined to understand complex effect of SDBS on aldicarb degradation process. The results showed that degradation curves of aldicarb in soil can be described with first order kinetics formula and the degradation rate constant. k (d(-1)), in surface soil was larger than that in subsurface soil. SDBS can accelerate the degradation of aldicarb in soil and there was a good linear relationship between degradation rate constant and the logarithm of SDBS concentration. The possible reasons were that SDBS could change pH value of soil, have solubilization effect on aldicarb, and be used as carbon source of microorganisms. But SDBS had a larger promotion to the degradation of aldicarb in surface than in subsurface soil. When SDBS concentration was 1000 mg/kg of dried soil the first order degradation rate constant of aldicarb could be increased by 56.6 percent in surface soil and by 27.6 percent in subsurface soil, respectively.

Effect of pH, Dissolved Organic Carbon, and Sodium Dodecyl Sulfate to Degradation of Fenobucarb Insecticide in Paddy Soil-Water System

“…Bacteria in natural systems can degrade insecticide residues in the soil by co-metabolising insecticides for nutrients and energy, thus reducing residuals in the soil and the environmental risk (Fenner et al, 2013;Park et al, 2003). Amine, alcohol, phenol, carbon dioxide (CO 2 ), and water are the nal degradation products of the decomposition process of carbamate insecticides (Allan et al, 2012;Liu et al, 2003). Ueji and Kanazawa (1979) reported that the disappearance rate of fenobucarb is proportional to its concentration in the soil.…”

Desorption and degradation of fenobucarb in paddy soil with the presence of pH, dissolved organic carbon, and sodium dodecyl sulphate in water

“…Bacteria in natural systems can degrade insecticide residues in the soil by co-metabolising insecticides for nutrients and energy, thus reducing residuals in the soil and the environmental risk (Park et al 2003;Fenner et al 2013). Amine, alcohol, phenol, carbon dioxide (CO 2 ), and water are the nal degradation products of the decomposition process of carbamate insecticides (Liu et al 2003;Allan et al 2012). Ueji and Kanazawa (1979) reported that the disappearance rate of fenobucarb is proportional to its concentration in the soil.…”