β-CHLOROPRENE CH2=CClCH=CH2
MW: 88.54
METHOD: 1002, Issue 2
1002
CAS: 126-99-8
RTECS: EI9625000
EVALUATION: FULL
OSHA : 25 ppm (skin) NIOSH: C 1 ppm/15 min; carcinogen ACGIH: 10 ppm (skin) (1 ppm = 3.62 mg/m 3 @ NTP)
PROPERTIES:
Issue 1: 15 February 1984 Issue 2: 15 August 1994
liquid; d = 0.958 g/mL @ 20 °C; BP 59.4 °C; MP -130 °C; VP 25 kPa (188 mm Hg; 25% v/v) @ 20 °C; explosive range 4 to 20% v/v in air
SYNONYMS: chloroprene; 2-chloro-1,3-butadiene; chlorobutadiene
SAMPLING SAMPLER:
SOLID SORBENT TUBE (coconut shell charcoal, 100 mg/50 mg)
FLOW RATE:
0.01 to 0.1 L/min
VOL-MIN: -MAX:
1.5 L @ 25 ppm 8L
SHIPMENT:
routine
SAMPLE STABILITY:
at least 8 days @ 25 °C [1,2]
BLANKS:
2 to 10 field blanks per set
MEASUREMENT TECHNIQUE:
GAS CHROMATOGRAPHY, FID
ANALYTE:
chloroprene
DESORPTION:
1 mL CS 2; stand 30 min
INJECTION VOLUME:
1 to 2 µL, splitless
TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:
CARRIER GAS:
N 2 or He, 1-3 mL/min
MAKEUP GAS:
nitrogen, 30 ml/min
COLUMN:
DB-1 fused capillary, 30 m x 0.25-mm ID, 1.0-µm film [3]
CALIBRATION:
solutions of distilled chloroprene in CS 2; hexane reference standard
RANGE:
0.1 to 0.6 mg per sample [2]
ACCURACY RANGE STUDIED:
44 to 174 mg/m 3 [2] (3-L samples)
BIAS:
- 1.1%
250 °C 280 °C 35 °C, 2 min; 15 °C/min to 300 °C, hold 5 min
ˆ ): 0.071 [2] OVERALL PRECISION (S rT ACCURACY:
± 13.9%
ESTIMATED LOD: 0.03 mg per sample [2,3] PRECISION (Sr):
0.021 [2]
APPLICABILITY: The working range is 10 to 60 ppm (40 to 200 mg/m 3) for a 3-L air sample. The method is sensitive enough to determine concentrations as low as 12 ppm in 15-min samples taken at 0.2 L/min. NIOSH has sampled for chloroprene at two polychloroprene processing plants.
INTERFERENCES: None known.
OTHER METHODS: This is Method S112 with improved GC column in a new format [4]. A similar method appears in the chloroprene criteria document [1].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
