ACETALDEHYDE by GC
CH3CHO
MW: 44.05
METHOD: 2538, Issue 1
CAS: 75-07-0
EVALUATION: UNRATED
OSHA : 200 ppm NIOSH: carcinogen; lowest feasible level ACGIH: C 25 ppm; suspect carcinogen (1 ppm = 1.801 mg/m 3 @ NTP)
PROPERTIES:
2538
RTECS: AB1925000 Issue 1:
15 August 1994
liquid; d 0.78 g/mL @ 20 °C; BP 20.4 °C; VP 100 kPa (750 mm Hg) @ 20 °C; explosive range 4 to 60% v/v in air
SYNONYMS: acetic aldehyde; ethanal.
SAMPLING SAMPLER:
MEASUREMENT
SOLID SORBENT TUBE [2-(hydroxymethyl)piperidine (2-HMP) on XAD-2, 450 mg/225 mg]
TECHNIQUE:
GAS CHROMATOGRAPHY, FID
ANALYTE:
oxazolidine derivative of acetaldehyde
FLOW RATE:
0.01 to 0.05 L/min
DESORPTION:
5 mL toluene, 60 min ultrasonic
VOL-MIN: -MAX:
1 L @ 100 ppm 12 L
INJECTION VOLUME:
1 µL, splitless
SHIPMENT:
routine
SAMPLE STABILITY:
TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:
100% recovery after 21 days @ 0 °C [1]
BLANKS:
2 to 10 field blanks per set
250 °C 300 °C 70 °C 1 min; 6 °C/min to 110 °C (hold 2 min) 30 °C/min to 260 °C (hold 1 min)
CARRIER GAS:
He, 1 mL/min; makeup 29 mL/min
COLUMN:
wide-bore, fused-silica capillary, 15 m x 0.32-mm; 1-µm DB-1301 film
ACCURACY RANGE STUDIED:
180 to 720 mg/m 3 [2] (3-L samples)
CALIBRATION:
standard solutions of acetaldehyde on coated sorbent
BIAS:
0.2%
RANGE:
4 to 2200 µg per sample [2]
ˆ ): 0.12 [2] OVERALL PRECISION (S rT
ESTIMATED LOD: 2 µg per sample [1, 2]
ACCURACY:
PRECISION (Sr):
± 23.7%
0.090 @ 26 to 107 µg per sample [1]
APPLICABILITY: The working range is 0.74 to 407 ppm (1.3 to 730 mg/m 3) for a 3-L air sample.
INTERFERENCES: None identified. An alternative chromatographic column is a 2 m x 6-mm OD x 2-mm ID glass column containing 10% UCON 50-HB-5100 + 2% KOH on 80/100 Chromosorb W-AW.
OTHER METHODS: This is an adaptation of OSHA Method 68 [1], and is a convenient alternative to Method 3507.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
