FACTORS AFFECTING EXTRACTION OF DIELDRIN-14C FROM SOIL

Dieldrin-14C was extracted from eight types of soils with various solvents under a variety of conditions. Recovery ofdieldrin from soil was increased with reduced soil particle size, increased dielectric constant of the solvent, and the presence of water in the soil during extraction;soil type and method of extraction were also important. Depending on the soil type, common extraction solvents like acetonitrile, hexane-2-propanol, and hexane-acetone mixtures extracted only 19 to 77% dieldrinfrom airdried soil, while exhaustive extraction in Soxhlet with 1-to-1 chloroform-methanol gave 100% recovery. Addition of 20% water (80% for muck soil) to the airdried soil immediately before extraction by 1 -to-1 mixtures of hexane-2-propanol, hexane-acetone, and benzene-methanol gave 92 to98% recovery for all types of soils. © 1969, American Chemical Society. All rights reserved.