ACETIC ACID
CH3COOH
MW: 60.05
METHOD: 1603, Issue 2
CAS: 64-19-7
1603
RTECS: AF1225000
EVALUATION: FULL
OSHA : 10 ppm NIOSH: 10 ppm; STEL 15 ppm ACGIH: 10 ppm; STEL 15 ppm (1 ppm = 2.46 mg/m 3 @ NTP)
Issue 1: 15 May 1989 Issue 2: 15 August 1994
PROPERTIES: liquid; d 1.049 g/mL @ 25 °C; BP 118 °C; MP 17 °C; VP 1.5 kPa (11.4 mm Hg) @ 20 °C; explosive range 5.4 to 16% v/v in air
SYNONYMS: glacial acetic acid; methane carboxylic acid; ethanoic acid
SAMPLING SAMPLER:
SOLID SORBENT TUBE (coconut shell charcoal, 100 mg/50 mg)
MEASUREMENT TECHNIQUE:
GAS CHROMATOGRAPHY, FID
ANALYTE:
acetic acid
FLOW RATE: 0.01 to 1.0 L/min
DESORPTION:
1 mL formic acid; stand 60 min
VOL-MIN: -MAX:
20 L @ 10 ppm 300 L
INJECTION VOLUME: 5 µL
SHIPMENT:
routine
SAMPLE STABILITY:
at least 7 days @ 25 °C
BLANKS:
2 to 10 field blanks per set
TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:
230 °C 230 °C 130 to 180 °C, 10°/min or 100 °C isothermal
CARRIER GASES: N 2 or He, 60 mL/min
ACCURACY RANGE STUDIED:
12.5 to 50 mg/m 3 [1] (173-L samples)
BIAS:
5.4%
COLUMN:
1 m x 4-mm ID glass; Carbopack B 60/80 mesh/3% Carbowax 20 M/0.5% H 3PO 4
CALIBRATION:
standard solutions of acetic acid in 88 to 95% formic acid
RANGE:
0.5 to 10 mg per sample
ESTIMATED LOD: 0.01 mg per sample [2]
ˆ ): 0.058 [1] OVERALL PRECISION (S rT ACCURACY:
± 15.5%
PRECISION (Sr):
0.007 @ 0.3 to 5 mg per sample [1,3]
APPLICABILITY: The working range is 2 to 40 ppm (5 to 100 mg/m 3) for a 100-L air sample. High (90% RH) humidity during sampling did not cause breakthrough at 39 mg/m 3 for 4.6 hrs [1].
INTERFERENCES: Formic acid contains a small amount of acetic acid which gives a significant blank value. High-purity formic acid must be used to achieve an acceptable detection limit. Alternate columns are 3-m glass, 2-mm ID, 0.3% SP-1000 + 0.3 % H 3PO 4 on Carbopack A and 2.4-m x 2-mm ID glass, 0.3% Carbowax 20M/0.1% H 3PO 4 on Carbopack C.
OTHER METHODS: This revises Method S169 [3].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94