Page:NIOSH Manual of Analytical Methods - 1002.pdf/1

 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