Page:NIOSH Manual of Analytical Methods - 1016.pdf/1

 (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