Table 4.

An overview of the 15 tape-sampled surface locations and the presence of titanium dioxide nanofibers and graphene oxide particles on different surfaces found during Study B.

Sampling location	Room	Related to work task number	Surface characteristics		SEM analysis
			Material	Assessed indication of roughness	Detection of TiO2 nanofiber (Yes/No)	Detection of graphene oxide particles (Yes/No)
Work areas
Work areas in fume hood	Chemistry laboratory	B1, B5	Stainless steel	Smooth	No	No
Cover on work area		B1, B5	Cardboard	Smooth	No	No
Sink		B1–2, B5–6	Stainless steel	Smooth	Yes	Yes
Desk next to abrasion testing machine	Test laboratory	B3–4, B7–8	Laminate	Smooth	No	Yes
Floors
Floor in front of fume hood	Chemistry laboratory	B1, B5	Epoxy coated concrete	Smooth	No	No
Floor in front of spray booth	Test laboratory	B2, B6	Epoxy coated concrete	Smooth	No	No
Floor	Conference room	–	Parquet	Smooth	No	No
Floor	Office 1	–	Laminate	Smooth	No	No
Door sill	Office 2	–	Wood	Smooth	No	No
Other surfaces
Balance in fume hood	Chemistry laboratory	B1, B5	Plastic	Smooth	No	Yes
Cover under the brush in the abrasion testing machine	Test laboratory	B3–4, B7–8	Metal	Smooth	Yes	No
Plate with graphene based coating, sampled after abrasion test with metal brush		B3	Metal with graphene based coating	Smooth	No	a
Plate with graphene based coating, sampled after abrasion test with nylon brush		B4	Metal with graphene based coating	Smooth	No	a
Plate with TiO2 nanofiber based coating, sampled after abrasion test with metal brush		B7	Metal with TiO2 nanofiber based coating	Smooth	No	No
Plate with TiO2 nanofiber based coating, sampled after abrasion test with nylon brush		B8	Metal with TiO2 nanofiber based coating	Smooth	Yes	No

–Far-field surfaces.

^aNot possible to determine which type of particles that are detected .