Determination of 2,4-d amine in soils using anion-exchange membranes
A new method for the quantitative determination of 2,4-D in soils by use of anion-exchange membranes with GC detection was developed. Preliminary investigation of ion-exchange properties of pure 2,4-D acid on the membranes revealed that whe11 a suitable solvent system is used, a quantitative recovery of 2,4-D acid can be achieved. Linear relationships between 2,4-D acid removed by the membrane and 2,4-D concentration in solutions, soil suspensions and soils were obtained within the range tested. The developed method was successfully applied for the determination of 2,4-D amine from a commercial formulation on soil surfaces. The method was tested in two concentration ranges representing a typical farm spraying application rate and a spill. The relationship between amount of 2,4-D amine detected by membranes and the spike level on the soil surface was linear for both concentration ranges. The applicability of the method was examined for a degradation study of 2,4-D amine after a spill. The low detection limit and the simplicity of the procedure make this method very suitable for 2,4-D determination in soils.
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