Page:NIOSH Manual of Analytical Methods - 2017.pdf/5

 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