Page:NIOSH Manual of Analytical Methods - 1018-1.pdf/1

 CHLORODIFLUOROMETHANE See DICHLORODIFLUOROMETHANE (Method 1018) for procedure

CHClF2

MW: 86.47

METHOD: 1018, Issue 1

CAS: 75-45-6

RTECS: PA6390000

EVALUATION: FULL

OSHA : no PEL NIOSH: 1000 ppm; STEL 1250 ppm ACGIH: 1000 ppm (1 ppm = 3.54 mg/m 3 @ NTP)

PROPERTIES:

Issue 1: 15 August 1994

gas; BP -40.8 °C; MP -160 °C; nonflammable

SYNONYMS: difluorochloromethane; Refrigerant 22.

SAMPLING SAMPLER:

MEASUREMENT

SOLID SORBENT TUBES (two coconut shell charcoal tubes in series, 400/200 mg and 100/50 mg)

TECHNIQUE:

GAS CHROMATOGRAPHY, FID

ANALYTE:

chlorodifluoromethane

FLOW RATE:

0.01 to 0.05 L/min

DESORPTION:

20 mL methylene chloride

VOL-MIN: -MAX:

1 L @ 1000 ppm 4L

INJECTION VOLUME:

1 µL

SHIPMENT:

refrigerated

SAMPLE STABILITY:

TEMPERATURE-INJECTOR: -DETECTOR: -COLUMN:

at least 7 days @ 25 °C

BLANKS:

2 to 10 field blanks per set

200 °C 260 °C 35 °C for 3 min, 15 °C/min to 75 °C, hold 6 min

CARRIER GAS:

He, 1.5 mL/min

COLUMN:

DB-1 fused silica capillary, 30 m x 0.32-mm ID, 1-µm film thickness or equivalent

CALIBRATION:

standard solutions of analyte in methylene chloride

RANGE:

0.1 to 14 mg per sample [3]

ACCURACY RANGE STUDIED:

1800 to 6970 mg/m 3 [3]

BIAS:

0%

ˆ ): 0.074 [3] OVERALL PRECISION (S rT

ESTIMATED LOD: 0.01 mg per sample [3]

ACCURACY:

PRECISION (Sr):

±14.5%

0.051 @ 0.53-10 mg per sample [3]

APPLICABILITY: The working range is 280 to 4000 ppm chlorodifluoromethane (1000 to 14,000 mg/m 3) for a 1-L air sample. This method was first evaluated for dichlorodifluoromethane and 1,2-dichlorotetrafluoroethane with packed column gas chromatography [1]. The method was recently evaluated specifically for chlorodifluoromethane using capillary chromatogra phy [3].

INTERFERENCES: None identified.

OTHER METHODS: This combines and revises Methods S111 and S108 [2].

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