ANILINE, o-TOLUIDINE, AND NITROBENZENE: METHOD 2017, Issue 1, dated 15 January 1998 - Page 5 of 5
TABLE 1. EXPOSURE LIMITS AND PHYSICAL PROPERTIES
Analyte
OSHA PEL (ppm)
NIOSH REL (ppm)
ACGIH TLV (ppm)
Aniline
5
Ca; lowest feasible
2
o-Toluidine
Ca; 0.02
Ca; 2
Nitrobenzene
1
Ca; lowest feasible (skin) 1
1
Physical Properties Liquid; d 1.022 g/mL @ 20 °C; BP 184°C; VP 0.089 kPa (0.3 mm Hg) @ 20 °C; MP −6 °C; explosive limits 1.3 to 11% in air. Liquid; d 1.006 g/mL @ 20 °C; BP 201 °C; MP −15 °C; VP 0.043 kPa (0.32 mm Hg) @ 20 °C Liquid, pungent odor; d 1.203 g/mL @ 20 °C; BP 211.0 °C; MP 5 °C; VP 37 kPa (0.28 mm Hg) @ 20 °C
Ca = potential human carcinogen
TABLE 2. ANALYTICAL MEASUREMENTS Analyte
1 ppm = mg/m³ @ NTP
Range Studied (µg/sample)
LOD (µg/sample)
Precision ( )
Aniline o-Toluidine Nitrobenzene
3.87 4.46 5.12
31 to 255 30 to 252 27 to 460
4 3 1
0.016 0.015 0.033
APPENDIX. PREPARATION OF SULFURIC ACID-TREATED FILTERS Acid-treated Gelman Type A/E, 37-mm, glass fiber filters, or equivalent, are prepared by soaking each filter with 0.5 mL of 0.26 N sulfuric acid. (0.26 N sulfuric acid can be prepared by diluting 1.5 mL of 36 N sulfuric acid to 200 mL with deionized water.) The filters are dried in an oven at 100 °C for 1 h and then assembled into 37-mm polystyrene cassettes without support pads. The cassettes are sealed with shrink bands and the ends are plugged with plastic plugs. Sulfuric acid-treated glass fiber filters also are available commercially—two treated filters preloaded in a 3-piece cassette. These samplers may be used, although this method specifies only one treated filter.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition
