Dieldrin-14C was extracted from eight types of soils with various solvents under a variety of conditions. Recovery of dieldrin from soil was increased with
Four different types of soil with 13 to 18% moisture content when field-collected were treated in that condition with an aqueous suspension of dieldrin-14C (field soils). Samples of the same soils were air-dried, treated with dieldrin-14C in pentane, and stored either in the air-dried state (dry soil) or after addition of 20% water (moist soil). All samples were stored for 6 to 8 months and subsequently extracted in the air-dried condition with various solvents. Extraction efficiencies of solvents were similar for the field and moist soils; much higher recoveries were obtained from the dry soils. Addition of 20% water to the soils immediately before extraction with 1 -to-1 hexane-acetone or hexane-2-propanol gave similar recoveries (92 to 98%) from all soil treatments. Thus fortification of airdried soils with dieldrin should not be used for measuring true recovery rates from field samples extracted in the air-dried state.
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