Page:NIOSH Manual of Analytical Methods - 2516.pdf/1

 DICHLOROFLUOROMETHANE

CHCl2F

MW: 102.92

METHOD: 2516, Issue 2

CAS: 75-43-4

RTECS: PA8400000

EVALUATION: FULL

OSHA : 1000 ppm NIOSH: 10 ppm ACGIH: 10 ppm (1 ppm = 4.21 mg/m 3 @ NTP)

SYNONYMS:

2516

PROPERTIES:

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

gas; BP 8.9 °C; d 1.405 g/mL @ 9 °C; vapor density (air = 1) 3.82; not combustible

Freon 21; Halon 112; dichloromonofluoromethane

SAMPLING SAMPLER:

MEASUREMENT

SOLID SORBENT TUBES (2 coconut shell charcoal tubes, 400 mg and 200 mg)

TECHNIQUE:

GAS CHROMATOGRAPHY, FID

ANALYTE:

dichlorofluoromethane

FLOW RATE:

0.01 to 0.05 L/min

DESORPTION:

5 mL CS 2; stand 30 min

VOL-MIN: -MAX:

0.25 L @ 1000 ppm 3L

INJECTION VOLUME:

SHIPMENT:

separate front and backup tubes to avoid migration

TEMPERATURE-INJECTOR: -DETECTOR: -COLUMN:

SAMPLE STABILITY:

at least 7 days @ 25 °C

CARRIER GAS:

N 2, 30 mL/min

BLANKS:

2 to 10 field blanks per set

COLUMN:

stainless steel, 6 m x 3-mm, 10% FFAP on 100/120 mesh Chromosorb WHP

1730 to 7640 mg/m 3 [1] (3-L samples)

BIAS:

3.0%

ˆ ): 0.061 [1] OVERALL PRECISION (S rT ACCURACY:

125 °C 220 °C 55 °C

CALIBRATION:

dichlorofluoromethane solutions in CS 2 with internal standard

RANGE:

1 to 35 mg per sample

ESTIMATED LOD:

0.05 mg per sample

PRECISION (Sr):

0.024 @ 6 to 34 mg per sample [1]

ACCURACY RANGE STUDIED:

5 µL

± 13.3%

APPLICABILITY: The working range is 120 to 1500 ppm (500 to 6300 mg/m 3) for a 2-L air sample.

INTERFERENCES: None known.

OTHER METHODS: This revises Method S109 [2].

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