Page:NIOSH Manual of Analytical Methods - 6006.pdf/1

 DIBORANE

B 2H6

MW: 27.67

6006

CAS: 19287-45-7

METHOD: 6006, Issue 2

EVALUATION:

OSHA : 0.1 ppm NIOSH: 0.1 ppm ACGIH: 0.1 ppm (1 ppm = 1.131 mg/m 3 @ NTP)

RTECS: HQ9275000

FULL

PROPERTIES:

Issue 1: 15 August 1987 Issue 2: 15 August 1994

gas; vapor density (air = 1) 0.96; BP -92.5 °C; MP -165.5 °C explosive range 0.8 to 98% v/v in air

SYNONYMS: boroethane, boron hydride

SAMPLING SAMPLER:

MEASUREMENT

FILTER + SOLID SORBENT TUBE (PTFE filter + oxidizer-impregnated charcoal, 100 mg/50 mg)

TECHNIQUE: ANALYTE:

boron

FLOW RATE:

0.5 to 1 L/min

DESORPTION:

10 mL 3% H 2O 2; stand 30 min; ultrasonic bath 20 min

VOL-MIN: -MAX:

60 L @ 0.1 ppm 260 L

WAVELENGTH:

249.8 nm

SHIPMENT:

routine

ENTRANCE SLITS:

50 x 300 mm

SAMPLE STABILITY:

at least 7 days @ 25 °C [1]

CALIBRATION:

aliquots of 1% (v/v) diborane adsorbed on impregnated charcoal

FIELD BLANKS:

2 to 10 field blanks per set

RANGE:

7 to 30 µg diborane per sample [1]

ESTIMATED LOD:

1 µg diborane per sample [1]

PRECISION (Sr):

0.063 @ 7 to 27 µg diborane per sample [1]

ACCURACY RANGE STUDIED:

0.06 to 0.25 mg/m 3 (120-L samples) [1]

BIAS:

- 4.8%

PLASMA EMISSION SPECTROMETRY

ˆ ): 0.085 [1] OVERALL PRECISION (S rT ACCURACY:

± 21.5%

APPLICABILITY: The working range is 0.05 to 0.22 ppm (0.06 to 0.25 mg/m 3) for a 120-L air sample.

INTERFERENCES: The filter removes boron-containing particulates. Avoid borosilicate glassware during sample preparation to prevent boron contamination of samples. Higher boranes (e.g., tetraborane) interfere but are not likely to be encount ered in most samples.

OTHER METHODS: This revises P&CAM 341 [2]. The measurement can also be done by inductively-coupled plasma atomic emission spectrometry (e.g., Method 7300).

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