NITROMETHANE
CH3NO2
MW: 61.04
METHOD: 2527, Issue 2
CAS: 75-52-5
2527
RTECS: PA9800000
EVALUATION: FULL
OSHA : 100 ppm NIOSH: no recommended standard ACGIH: 100 ppm (1 ppm = 2.50 mg/m 3 @ NTP)
Issue 1: 15 August 1987 Issue 2: 15 August 1994
PROPERTIES: liquid; d 1.138 g/mL @ 20 °C; BP 101.2 °C; MP -29 C; VP 4.9 kPa (37 mm Hg; 4.8% v/v) @ 25 C; lower explosive limit 7.3% (v/v) in air
SYNONYMS: nitrocarbol.
SAMPLING
MEASUREMENT
SAMPLER:
SOLID SORBENT TUBE (Chromosorb 106, 600 mg/300 mg)
TECHNIQUE:
GAS CHROMATOGRAPHY, NITROGENSPECIFIC DETECTOR
FLOW RATE:
0.01 to 0.05 L/min
ANALYTE:
nitromethane
VOL-MIN: -MAX:
1.2 L @ 100 ppm 3 L [1]
DESORPTION:
5 mL ethyl acetate; stand 30 min
SHIPMENT:
separate front and back sorbent sections
INJECTION VOLUME:
5.0 µL
SAMPLE STABILITY:
stable 7 days @ 25 °C [1]
BLANKS:
2 to 10 field blanks per set
TEMPERATURE-INJECTOR: -DETECTOR: -COLUMN:
225 C 300 C 100 C
CARRIER GAS:
He or N 2, 20 mL/min
COLUMN:
stainless steel, 2-m x 4-mm ID, packed with 10% SP 1000 on 80/100 mesh Chromosorb WHP
ACCURACY RANGE STUDIED:
123 to 501 mg/m 3 (3-L samples) [1]
CALIBRATION:
standard solution of nitromethane in ethyl acetate
BIAS:
- 0.73% [1]
RANGE:
0.3 to 2 mg per sample [1]
ˆ ): 0.078 [1] OVERALL PRECISION (S rT
ESTIMATED LOD: not determined
ACCURACY:
PRECISION (Sr):
± 15.2%
0.042 @ 0.34 to 1.34 mg per sample [1]
APPLICABILITY: The working range is 60 to 360 ppm (150 to 900 mg/m 3) for a 2-L air sample.
INTERFERENCES: None identified.
OTHER METHODS: This revises Method S220 [2].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
