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
