The sample was dissolved by naoh,perhydol,after acidity adjustment,complexing main Al with EDTA, berrylon as aggregation agent, subside Sn by use of ammonia water and interfer element seperation, sediment was dissolved directly with hydrochloric acid - selmiac original liquid, the polarogram determination has a sample operation and applicated in determination of over 0.001% Sn in every Al alloy.The method has a good result and its increment recovery ratio is 96 ～ 102% .

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