ETHYLENE GLYCOL
HOCH2CH2OH
MW: 62.07
METHOD: 5500, Issue 2
5500
CAS: 107-21-1
EVALUATION:
OSHA : no standard NIOSH: Group III Pesticide ACGIH: C 50 ppm (1 ppm = 2.54 mg/m 3 @ NTP)
FULL
PROPERTIES:
RTECS: KW2975000
Issue 1: 15 February 1984 Issue 2: 15 August 1993
liquid; MP - 13 °C; BP 198 °C; d 1.1135 g/mL @ 20 °C; VP 0.007 kPa (0.20 mm Hg) @ 20°C; explosive limits 3.2 to 15.3% in air
SYNONYMS: 1,2-ethanediol; 1,2-Dihydroxyethane; ethylene alcohol; ethylene dihydrate
SAMPLING SAMPLER:
MEASUREMENT
FILTER + SORBENT (glass fiber filter + silica gel, 520 mg/260 mg)
TECHNIQUE:
GAS CHROMATOGRAPHY, FID
ANALYTE:
ethylene glycol
FLOW RATE: 0.2 L/min VOL-MIN: -MAX: SHIPMENT:
SILICA GEL DESORPTION:
0.3 L 60 L filter in glass vial with 1 mL 2% (v/v) 2-propanol/H 2O directly after sampling; silica gel tube sealed with plastic caps
1 mL 2% (v/v) 2-propanol in H 2O, sonicate for 15-30 min (5 min not enough to desorb analyte)
INJECTION VOLUME:
1 µL
SAMPLE STABILITY:
at least 15 days (silica gel) @ 25 °C [1]
TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:
FIELD BLANKS:
2 to 10 field blanks per set
CARRIER GAS:
N 2 or He, 30 mL/min
COLUMN:
glass, 1.9 m x 2-mm; 3% Carbowax 20M on 80/100 Chromosorb 101
CALIBRATION:
solutions of ethylene glycol in 2% (v/v) 2-propanol in H 2O
RANGE:
0.02 to 1 mg per sample
ACCURACY RANGE STUDIED:
45 to 98 mg/m 3 [1]
BIAS:
3.3% [1]
ˆ rT): OVERALL PRECISION (S
0.084 (aerosol); 0.087 (vapor) [1]
ACCURACY:
± 20.4%
250 °C 300 °C 165 °C
ESTIMATED LOD: 4 µg per sample PRECISION (Sr):
0.060 (filters); 0.061 (silica gel) [1]
APPLICABILITY: The working range is 7 to 330 mg/m 3 for a 3-L air sample.
INTERFERENCES: A ghosting phenomenon which was described by Spitz [2] caused little or no error in measurements when samples were analyzed with standards at similar concentrations. Improved separation of ethylene glycol and other glycols can be achieved using a 30-m-Rtx-35 (0.53 mm ID; 3.0 µm film) capillary column.
OTHER METHODS: This method originally was designated P&CAM 338 [3] and was evaluated with a reference method which involved sampling with bubblers containing water, oxidation of ethylene glycol to formaldehyde with periodic acid and co lorimetric analysis [1].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/93
