National Institute for Occupational Safety and Health

“ Weigh the dry sorbent and place it in a 250-mL round-bottom flask. 5. Weigh an amount of maleic anhydride equivalent to 20% of the weight of the sorbent and dissolve it in 50 mL acetone. 6. Add the maleic anhydride solution to the sorbent, swirl, and remove the solvent in a rotary evaporator. Dry in a vacuum oven at 30 °C for 15 min. Use the coated sorbent within 20 days of preparation. NOTE: Refrigeration in a sealed container may prolong shelf life [1,4] . ”

“ The concentrations of 1,3-cyclopentadiene were confirmed by collecting samples from the generator in bubblers containing 15 mL solution of 74 mg/mL maleic anhydride in ethyl acetate and analysis by GC/FID. Samples were stored at room temperature for one week and found to be stable. ”

“ Maleic anhydride is a powerful irritant and can cause burns and pulmonary edema. Avoid exposure to concentrated vapor. Avoid contact with skin, eyes
SAMPLING: 1. 2. 3. 4.
1. Sampler: glass tube, 8.5 cm long, 6-mm OD, 4-mm ID, with plastic caps, containing two sections of coated sorbent (front = 100 mg; back = 50 mg) , held in place and separated with glass wool plugs. Prior to packing, rinse the empty tube with acetone and dry to eliminate static adhesion of sorbent onto the tube wall. Pressure drop across sampler ≤2.5 kPa (25 cm water) at 0.05 L/min airflow. ”