ARSINE
AsH3
MW: 77.95
METHOD: 6001, Issue 2
CAS: 7784-42-1
6001
RTECS: CG6475000
EVALUATION: FULL
OSHA : 0.05 ppm NIOSH: C 0.002 mg/m 3/15 min; carcinogen ACGIH: 0.05 ppm; carcinogen (1 ppm = 3.19 mg/m 3 @ NTP)
Issue 1: 15 May 1985 Issue 2: 15 August 1994
PROPERTIES: gas; d 3.484 g/L @ 20 °C; BP -62.5 °C; MP -116.3 °C
SYNONYMS: hydrogen arsenide; arsenic trihydride.
SAMPLING
MEASUREMENT
SAMPLER:
SOLID SORBENT TUBE (coconut shell charcoal, 100 mg/50 mg)
TECHNIQUE:
ATOMIC ABSORPTION, GRAPHITE FURNACE
FLOW RATE:
0.01 to 0.2 L/min
ANALYTE:
arsenic
VOL-MIN: -MAX:
0.1 L @ 0.05 ppm 10 L
DESORPTION:
1 mL 0.01 M HNO 3 ; 30 min in ultrasonic bath
SHIPMENT:
routine
MATRIX MODIFIER:
Ni2+ , 1000 µg/mL
SAMPLE STABILITY:
at least 6 days @ 25 °C [1]
WAVELENGTH:
193.7 nm; D 2 or H 2 correction
BLANKS:
2 to 10 field blanks per set
GRAPHITE FURNACE:
DRY: 40 sec @ 110 °C; CHAR: 15 sec @ 1200 °C; ATOMIZE 7 sec @ 2540 °C
INJECTION:
50 µL
CALIBRATION:
As(III) in 0.01 M HNO 3 with 100 mg charcoal present
RANGE:
0.01 to 0.3 µg per sample [2]
ACCURACY RANGE STUDIED:
BIAS:
0.09 to 0.4 mg/m 3 [1] (10-L samples); 0.001 to 0.01 mg/m 3 [2] -6.13% at 0.01 to 0.2 L/min rates [1]; -11% @ 0.876 L/min [2]
ˆ ): 0.087 [2] OVERALL PRECISION (S rT ACCURACY:
± 23.2%
ESTIMATED LOD: 0.004 µg per sample PRECISION (Sr):
0.060 @ 0.012 to 0.11 µg per sample [2]
APPLICABILITY: The working range is 0.0003 to 0.06 ppm (0.001 to 0.2 mg/m 3 ) for a 10-L air sample. This is an elemental analysis and is not compound-specific.
INTERFERENCES: Use background correction to control molecular absorption. Other arsenic compounds (gases or aerosols) may be collected on the sampler and would be erroneously reported as arsine. A cellulose ester filter in front of the ch arcoal tube may be used to remove aerosols [3,4]. The effect of relative humidity on the capacity of charcoal for arsine has not bee n studied.
OTHER METHODS: This method combines and replaces P&CAM 265 [5] and S229 [6] for arsine.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
