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The effect ofweak magnetic field(WMF)on Se(Ⅳ)removalby zero valent iron(ZVI)was investigated as functions of pH and initial Se(Ⅳ)concentrations.Twopieces of neodymium-iron-boron permanent magnets on an iron sheetto offer magnetic fieldas shown in Figure1.The maximum magnetic field intensitywas determinedto be~20 mT.