Properties,formation and evolution mechanisms of environmental persistent free radicals(EPFRs)
Environmentally Persistent Free Radicals(EPFRs)are a group of emerging environmental risk substances,which are stable,long-lived and persistent in the normal environment.Unlike traditional organic or inorganic persistent pollutants,the risks raised by EPFRs are redox reactions rather than structural and chemical toxicity.Understanding the properties,occurrence and evolution mechanisms of EPFRs is important to evaluate EFPRs'environmental fate and health threats.Therefore,in this review,an overview of the development of EPFRs researches and the properties of EPFRs was firstly provided.Then,the main formation mechanisms of EPFRs were illustrated,such as the electron transfer raised by transition metals,as well as the breakage of covalent bond and electron delocalization in organic compounds.Finally,the effects represented by water and oxygen molecules on the evolution of EPFRs were elucidated.
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