Page:NIOSH Manual of Analytical Methods - 2527.pdf/1

 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