cyclodextrins, pesticides, contaminated soil
Nshime, Bertil and Lantz, Andrew, "Extraction of Pesticides from Contaminated Soil via Cyclodextrin Complexation" (2010). Student Summer Scholars. Paper 53.
Cyclodextrins (CDs) were successfully used to extract numerous commonly used pesticides from contaminated soil via cyclodextrin complexation, a more environmentally friendly method compared to surfactants and organic solvents. A combination of five CDs (α-CD, β-CD, γ-CD, hydroxypropyl-β-CD (HP-β-CD), and methylated-β-CD (M-β-CD)) and eight pesticides (2,4-Dichlorophenoxyacetic acid (2,4-D) alachlor, acetochlor, diazinon, dicamba, dimethanamid, metalochlor and propanil) were examined in this study. It was found that a linear relationship exists between the concentrations of the M-β-CD and alachlor, which generally indicates that the amount of pesticide extracted depends on the concentration of the cyclodextrin present. With some pesticide-cyclodextrin combination, it was found that as the concentration of cyclodextrin increases the CD-pesticide inclusion complex precipitated out of solution, thus reducing the solubility of the pesticide. Overall the most effective extractants based on this study were found to be HP-β-CD and M-β-CD.