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FeⅡEDTA solution is of high efficiency for NO absorption.However, it can be easily oxidized by oxygen and lose its scrubbing function.In order to reuse the invalid absorption solution, the waste was precipitated and separated from the solution.FTIR revealed that this substance contained EDTA and Fe-O bond.Elemental analysis showed that the complex contained C, H, O, N, Fe and Na.CCD diffractometer data illustrated EDTA was converted into Ethylenediaminetetraacetic acid iron(Ⅲ) sodium salt and the molecular formula was C1oH12N2FeNa.3H2O.