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3% of the NDMA formation potential (FP) was reduced after the reaction. The visible-light driven 20%-Fe3O4/GE/SCN catalytic technology is a promising method not only for the control of NDMA FP but also the catalyst could be recovered and reused.Glass microspheres are widely used as reflective components in road and pavement marking materials. They commonly occur in road dust mixed with different particles of anthropogenic and geogenic origin. This paper describes different methods that enable discrimination of glass microspheres from