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A solution (15 mL) containing sample or standards of cadmiumand lead ions and DT (3 mg L1) at pH of 7.0 was poured into aglass screw-cap conical-bottom centrifuge tube. Then 0.5 mL ofmethanol solution (as disperser solvent) containing benzophenone(0.02% (w/v)) (as sorbent) was rapidly injected into a sample solutionby using 1.0 mL syringe. A cloudy solution formed in the testtube (the cloudy state was stable for a long time). This cloudy stateresulted from the dispersion of fine particles of benzophenone inthe bulk aqueous sample. Then, the mixture was centrifuged at4500 rpm for 3 min. Accordingly, after centrifuge, the dispersedfine particles of benzophenone were sedimented in the bottom ofthe conical test tube. The aqueous phase was then separated completelyby a syringe. Later, the sedimented phase was dissolved andmade up to 1.0 mL by adding ethanol. The resultant solution wasintroduced into the flame by conventional aspiration. The schemefor extraction and determination steps is illustrated .
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