MONOMETHYLANILINE
C6H5NH(CH3)
MW: 107.16
METHOD: 3511, Issue 1
3511
CAS: 100-61-8
RTECS: BY4550000
EVALUATION: PARTIAL
OSHA : 2 ppm (skin) NIOSH: 0.5 ppm (skin) ACGIH: 0.5 ppm (skin) (1 ppm = 4.38 mg/m 3 @ NTP)
Issue 1: 15 August 1994
PROPERTIES: liquid, discolors on standing; MP - 57 °C; BP 194 - 196 °C; d = 0.989 g/mL @ 20 °C; VP 40 Pa (0.3 mm Hg) @ 20 °C
SYNONYMS: N-methylaniline; N-methylbenzenamine
SAMPLING SAMPLER:
MIDGET BUBBLER (0.05 M sulfuric acid, 10 mL)
FLOW RATE:
0.2 to 1.0 L/min
VOL-MIN: -MAX:
11 L @ 2 ppm 100 L
SHIPMENT:
take care to prevent spillage
MEASUREMENT TECHNIQUE:
GAS CHROMATOGRAPHY, FID
ANALYTE:
monomethylaniline
EXTRACTION:
neutralize with 1 mL 4 M NaOH
INJECTION VOLUME:
5 µL
CARRIER GAS:
N 2, 50 mL/min
SAMPLE STABILITY:
at least 7 days @ 25 °C
BLANKS:
2 to 10 field blanks per set
TEMPERATURE-INJECTOR: -DETECTOR: -COLUMN:
BULK SAMPLE:
required
COLUMN:
60/80 mesh Chromosorb 103, 2ft x 1/8"O.D., with an Ascarite precolumn
CALIBRATION:
standard solutions of monomethylaniline in sulfuric acid
RANGE:
0.1 to 3 mg per sample [1]
ACCURACY RANGE STUDIED:
4.38 to 17.52 mg/m 3 [1] (100-L samples)
BIAS:
none [1]
245 °C 275 °C 170 °C
ESTIMATED LOD: 8 µg per sample
ˆ ): 0.089 [1] OVERALL PRECISION (S rT ACCURACY:
± 26.38%
PRECISION (Sr):
0.024 [1]
APPLICABILITY: The working range is 0.2 to 7 ppm (1 to 30 mg/m 3) for a 100-L air sample. Using a nitrogen-specific detector instead of a FID will greatly increase sensitivity. This alternate detector has been used for amines with a 30-m x 0.25- mm x 0.25µm film DB-5 (5% methyl, phenyl-50% dimethyl-polysiloxane) fused-silica capillary column with a liner packed with KOH-co ated glass wool.
INTERFERENCES: None known.
OTHER METHODS: This revises Method S153 [2].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
