Page:NIOSH Manual of Analytical Methods - 5500.pdf/1

 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