Polar solvents based on aqueous methanol and aqueous acetonitrile are good extractants of herbicides from Saskatchewan field soils that had received treatments of the individual chemicals 6 to 17 months previously. The addition of small amounts of acetic acid or ammonium hydroxide to aqueous acetonitrile resulted in greater recovery of most herbicides. In general, 50 ml of the extraction solvent were added to 20 g of soil and the soils were then initially extracted for 1-hr on a wrist-action shaker and then allowed to stand overnight before being shaken for a further 1-hr period.
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