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      The halogens or halogen elements are a series of nonmetal elements from Group 17 IUPAC Style (formerly: VIIA) of the periodic table, comprising fluorine,  chlorine, bromine, iodine, and astatine. Beacause astatine is a radioelement, halogen general comprise F、Cl、Br、I.


       flame retardant、refrigerant、solvent、organic chemical material、 insecticide、bleacher、wool degreaser etc.


      The halogens not only are toxic to immune system and carcinogenic, but also can effect endocrine system and reproductive. Most halogen compounds are environmental hormone substances.

      Correlative regulation and directive on prohibition use of halogen:
      EU 2002/95/EC
      bromize flame retardant The Montreal Protocol on Substances that Deplete the Ozone Layer》-five kinds of  chlorofluorocarbons (CFCs) and three kinds of halons.
      Stockholm Climate Pact》-chlorinated pesticide, hexachlorobenzene, PCB, PCDDs, PCDFs.
      chlorine, bromine, total halogen.

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