(1) 1,1,1,2-TETRACHLORO-2,2-DIFLUOROETHANE and (2) 1,1,2,2-TETRACHLORO-1,2-DIFLUOROETHANE (1): CCl3CClF2 (2): CCl2FCCl2F
MW: 203.83
METHOD: 1016, Issue 2
CAS: (1) 76-11-9 (2) 76-12-0
RTECS: (1) KI1425000 (2) KI1420000
EVALUATION: PARTIAL
OSHA : 500 ppm NIOSH: 500 ppm ACGIH: 500 ppm (1 ppm = 8.34 mg/m 3 @ NTP)
PROPERTIES:
1016
Issue 1: 15 May 1989 Issue 2: 15 August 1994
solids; MP (1) 40.6 °C; (2) 25 °C; BP (1) 91.5 °C, (2) 93 °C; VP 5.3 kPa (40 mm Hg; 5.2% v/v) @ 20 °C; not combustible
SYNONYMS: (1): Refrigerant 112a. (2): Refrigerant 112. SAMPLING SAMPLER:
SOLID SORBENT TUBE (coconut shell charcoal, 100 mg/50 mg)
FLOW RATE:
0.01 to 0.035 L/min
VOL-MIN: -MAX:
0.5 L @ 500 ppm 2L
SHIPMENT:
routine
SAMPLE STABILITY:
not tested
BLANKS:
2 to 10 field blanks per set
MEASUREMENT TECHNIQUE:
GAS CHROMATOGRAPHY, FID
ANALYTE:
1,1,1,2-tetrachloro-2,2-difluoroethane; 1,1,2,2-tetrachloro-1,2-difluoroethane
DESORPTION:
1 mL CS 2; stand 30 min
INJECTION VOLUME:
5 µL
TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:
BIAS:
(1): 2160 to 9020 mg/m 3 [1] (2): 1880 to 8060 mg/m 3 [1] (1) 0.17% (2) 2.0%
(2) 50 °C 240 °C 50 °C
CARRIER GAS:
nitrogen, 30 mL/min
COLUMN:
3 m x 3-mm OD stainless steel packed with 10% FFAP on 80/100 mesh Chromosorb WHP
CALIBRATION:
standard solutions in CS 2
RANGE:
2 to 20 mg per sample
ACCURACY RANGE STUDIED:
(1) 185 °C 250 °C 50 °C
ˆ ): (1): 0.069; OVERALL PRECISION (S rT (2): 0.054 [1]
ESTIMATED LOD: 0.3 mg per sample
ACCURACY:
PRECISION (Sr): (1): 0.27 @ 4 to 17 mg per sample [1]; (2): 0.005 @ 4 to 17 mg per sample [1]
(1) ± 32.4% (2) ± 11.4%
APPLICABILITY: The working range for either analyte is 120 to 1400 ppm (1000 to 12,000 mg/m 3) for a 2-L air sample. These compounds are used as degreasing solvents, refrigerants, foaming agents and corrosion inhibitors. Capillary columns may be used (DB-Wax or Nukol on fused silica, 3 m x 0.32-mm, 0.5 µm film) with appropriate changes in instrumental conditions.
INTERFERENCES: None reported.
OTHER METHODS: This combines and revises Methods S131 and S132 [2].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
