Elution Efficiency of Herbicides Polluted Soil Samples

摘要

Simulated soil samples, quartz sands contaminated with 2,4-D, MCPA and dicamba, are separated using the method of ethanol elusion. The experimental results show that the elution temperature, the elution method and the purity of the eluting agent have obvious influence on separation efficiency. In addition, the elution velocity and the pollutant loading of soil have less effect. The impacts of these factors on the separation efficiency of 2,4-D is higher than that of MCPA and dicamba. With the increment of temperature, the separation efficiencies of three herbicides increase rapidly when the elution temperature is below 293 K, while the separation efficiencies increase slowly when the elution temperature is above 293 K. With the reduction of purity of elution agent, the downtrend of separation efficiency in the range of 95-90% or 90-85% is steeper than that of 100-95%. Compared with oft-repeated stationary method, continuous flowing method shows the advantages for three pollutants.