Page:NIOSH Manual of Analytical Methods - 2015.pdf/1

 CHLOROACETALDEHYDE

CH2ClCHO

MW: 78.50

METHOD: 2015, Issue 1

CAS: 107-20-0

2015

RTECS: AB2450000

EVALUATION: FULL

OSHA : C 1 ppm NIOSH: C 1 ppm ACGIH: C 1 ppm (1 ppm = 3.21 mg/m 3 @ NTP)

Issue 1: 15 August 1994

PROPERTIES: liquid; d 1.236 g/mL @ 20 °C; sp. gr. (40% aq. soln.) 1.19; BP 85 °C; MP -16.3 °C; VP 13.3 kPa (100 mm Hg)

SYNONYMS: 2-chloroacetaldehyde; 2-chloroethanal

SAMPLING SAMPLER:

SOLID SORBENT TUBE (silica gel, 520 mg/260 mg)

FLOW RATE:

0.05 to 0.2 L/min (0.2 L/min for 15-min ceiling sample)

VOL-MIN: -MAX:

MEASUREMENT 63

TECHNIQUE:

GAS CHROMATOGRAPHY,

ANALYTE:

chloroacetaldehyde

DESORPTION:

25 mL 50% aqueous methanol, 30 min

0.3 L @ 1 ppm 16 L

INJECTION VOLUME:

2 µL with 3 µL water as flush

SHIPMENT:

routine; submit separate bulk sample

SAMPLE STABILITY:

TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:

at least 7 days @ 25 °C

FIELD BLANKS:

2 to 10 field blanks per set

BIAS:

5% argon in methane, 50 mL/min

COLUMN:

glass, 1.8 m x 6 mm OD, packed with 60/80 mesh Chromosorb 101

CALIBRATION:

standard solutions of chloroacetaldehyde in 50% aqueous methanol

1.8 to 6.4 mg/m 3 (3-L samples)

RANGE:

1 to 19 µg per sample [1]

-0.4%

ESTIMATED LOD: 0.1 µg per sample [1]

ˆ ): 0.060 [1] OVERALL PRECISION (S rT ACCURACY:

250 °C 300 °C 150 °C

CARRIER GAS:

ACCURACY RANGE STUDIED:

Ni ECD

PRECISION (Sr):

0.036 [1]

±12.2%

APPLICABILITY: The working range is 0.1 to 2 ppm (0.33 to 6.3 mg/m 3) for a 3-L air sample. The method is not able to distinguish between chloroacetaldehyde and the monomer or dimer hydrate forms of chloroacetaldehyde.

INTERFERENCES: None identified.

OTHER METHODS: This is method S11 [2] in a revised format. Chloroacetaldehyde in air has also been determined by differential pulse polarography [3].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94