| abstract |
【Task】 With heavy metal pollutants that are complex-contaminated with harmful cationic species and anionic species, conventional divalent iron heavy metal treatment agents have problems in terms of stability and handling, and the treatment performance of heavy metals is insufficient. . [Solution] A heavy metal treatment agent containing a water-soluble divalent iron compound and an aliphatic α-hydroxycarboxylic acid and / or a salt thereof has high storage stability in an aqueous solution and highly insolubilizes not only hexavalent chromium but also arsenic and selenium. It is possible to perform heavy metal processing with high reliability. Moreover, since the pH of the aqueous solution can be made relatively high, there are few problems of corrosion, and no harmful gas is generated when used in combination with other chelating agents. [Selection figure] None |