Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/20/1998
Publication Date: N/A
Technical Abstract: Organoclays, good sorbents for pesticides, may be effective for immobilization of pesticides present as contaminants in a soil, thereby preventing runoff to surface water and leaching to groundwater. The objective of this research was to assess the sorption capacity of bentazon, a mobile herbicide, on diverse organoclays and their efficacy in immobilizing it once in soil. Organoclays with large quaternary alkylammonium groups, hexadecyltrimethyl (HDTM) and dioctadecyl-dimethyl (DODM), adsorbed much more bentazon than those with large primary and small quaternary alkylammonium groups, octadecyl (C18) and phenyltrimethyl (PTM). Aqueous CaCl2 extractability of bentazon from contaminated sandy-clay soil decreased from 80 percent to 1 percent when the contaminated soil was mixed with 10 percent clay-HDTM or clay-DODM soil and incubated for 9 d. These data suggest that large quaternary alkylammonium organoclays may be useful as immediate immobilizing agents for remediation of contaminated soils.