National Institute for Occupational Safety and Health

“ Pipets, 1- and 10-mL glass, delivery, with pipet bulb.
SPECIAL PRECAUTIONS: Monomethylaniline is toxic by inhalation, ingestion, and skin absorption [3,4] . Sodium hydroxide is corrosive to tissue. Wear gloves and work in a hood.
SAMPLING: 1. 2. 3. 4. 5. 6.
Calibrate each personal sampling pump with a representative sampler in line. Attach outlet of impinger to the sampling pump. Place an empty bubbler or impinger in line behind the sampler to catch any splashover during sampling. Sample 11 to 100 L of air at an accurately known flow rate in the range 0.2 to 1.0 L/min. ”

“ Bring the volume of each sample to 10 mL with 0.05 M sulfuric acid. Add 1 mL 4 M sodium hydroxide and mix thoroughly. The pH of the resulting solution should be greater than 10. Analyze sample immediately to avoid loss of amine as the free base.
CALIBRATION AND QUALITY CONTROL: 10.
11.
Prepare at least six working standards (0 to 300 μg/ mL of monomethylaniline) . a. Add appropriate aliquots of calibration stock solution to 0.05 M sulfuric acid. Follow neutralization procedure as in step 8. b. Analyze working standards together with samples and blanks (steps 13 through 15) . c. ”

“ Hawley's Condensed Chemical Dictionary, 11th ed. Sax, N.I. and Lewis, R.J., Eds. Van Nostrand Reinhold Co., New York, NY (1987) . NIOSH/OSHA Occupational Health Guidelines for Chemical Hazards, US DHHS (NIOSH) Publ. ”