National Institute for Occupational Safety and Health

“ Explosive peroxides can form in THF during exposure to air in the absence of an inhibitor. THF vapor irritates the eyes and respiratory tract and cause headache, dizziness and narcosis. THF liquid can irritate the skin. If THF is distilled, distill in the presence of ferrous sulfate or other reducing agent. Store THF under nitrogen in a dark glass or metal container. 1,1,2,2-Tetrabromoethane is toxic, narcotic and can irritate the eyes and skin [3] . n-Hexane is a serious fire risk [flash point (closed cup) = -30 °C] . ”

“ Place the front and back sorbent sections of the sampler tube in separate vials. Discard the glass wool and foam plugs. Add 1.0 mL THF to each vial. Attach crimp cap to each vial. Allow to stand 30 min with occasional agitation.
CALIBRATION AND QUALITY CONTROL: 8.
9.
10.
Calibrate daily with at least six working standards over the range 0.1 to 4 mg 1,1,2,2-tetrabromoethane per sample. Working standard should be prepared fresh daily. a. Add known amounts of calibration stock solution to THF in 10-mL volumetric flasks and dilute to the mark. b. ”

“ Volumetric flasks, 10-mL. Syringes, 500-μL, readable to 10 μL. Syringes, 10-μL, readable to 0.1 μL. U-tube, 25 cm x 15-mm ID, with glass stopcocks. Temperature bath, 75 °C.
SPECIAL PRECAUTIONS: THF is a serious fire risk [flash point (open cup) = -15 °C] . ”