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
