Page:NIOSH Manual of Analytical Methods - 1011.pdf/1

 ETHYL BROMIDE

CH3CH2Br

MW: 108.97

METHOD: 1011, Issue 2

1011

CAS: 74-96-4

RTECS: KH6475000

EVALUATION: PARTIAL

OSHA : 200 ppm NIOSH: no REL ACGIH: 5 ppm (skin); suspected carcinogen (1 ppm = 4.46 mg/m 3 @ NTP)

PROPERTIES:

Issue 1: 15 May 1985 Issue 2: 15 August 1994

liquid; d 1.461 g/mL @ 20 °C; BP 38 °C; MP -119 °C; VP 51 kPa (380 mm Hg; 50% v/v) @ 20 °C; explosive range 6.8 to 11% v/v in air

SYNONYMS: bromoethane

SAMPLING SAMPLER:

SOLID SORBENT TUBE (coconut shell charcoal, 100 mg/50 mg)

FLOW RATE:

0.01 to 0.2 L/min

VOL-MIN: -MAX:

0.5 L @ 200 ppm 4L

SAMPLE STABILITY:

not known

FIELD BLANKS:

2 to 10 field blanks per set

MEASUREMENT TECHNIQUE:

GAS CHROMATOGRAPHY, FID

ANALYTE:

ethyl bromide

DESORPTION:

1 mL 2-propanol; overnight

INJECTION VOLUME:

5 µL

TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:

ACCURACY RANGE STUDIED:

550 to 2200 mg/m 3 [1] (4-L samples)

BIAS:

- 6.4%

200 °C 300 °C 60 °C

CARRIER GAS:

N 2 or He, 30 mL/min

COLUMN:

3 m x 3-mm OD stainless steel; 10% FFAP; on 80/100 mesh Chromosorb W-AW

CALIBRATION:

standard solutions of ethyl bromide in 2-propanol

RANGE:

0.4 to 10 mg per sample

ESTIMATED LOD: 0.02 mg per sample [2]

ˆ ): 0.054 [1] OVERALL PRECISION (S rT ACCURACY:

± 15.0%

PRECISION (Sr):

0.025 @ 1.8 to 8.5 mg per sample [1]

APPLICABILITY: The working range is 22 to 560 ppm (100 to 2500 mg/m 3) for a 4-L air sample. Ethyl bromide is used in organic synthesis as a solvent and as a refrigerant, anesthetic, and grain and fruit fumigant.

INTERFERENCES: None reported. An alternate GC column is 30 m x 0.32-mm fused silica capillary coated with 0.5-µm DBWAX at 50 °C isothermal [2].

OTHER METHODS: This revises Method S106 [3].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94