PHOSPHINE PH3
MW: 34.00
METHOD: 6002, Issue 2
OSHA : NIOSH: ACGIH:
6002
CAS: 7803-51-2
RTECS: SY7525000
EVALUATION: FULL
0.3 ppm 0.3 ppm; 1 ppm STEL 0.3 ppm; 1 ppm STEL (1 ppm = 1.39 mg/m3 @ NTP)
PROPERTIES:
Issue 1: 15 August 1994 Issue 2: 15 January 1998
gas, BP 87.8 C; vapor density 1.17 (air = 1); spontaneously flammable in air if P2H4 is present
SYNONYMS: hydrogen phosphide; phosphorous hydride; phosphorated hydrogen; phosphorous trihydride
SAMPLING SAMPLER:
MEASUREMENT
SORBENT TUBE (Hg(CN)2-coated silica gel, 300 mg/150 mg)
TECHNIQUE:
UV-VIS SPECTROMETER
ANALYTE:
phosphate
EXTRACTION:
10 mL hot (65-70 C) acidic permanganatereagent solution
DETECTOR:
UV @ 625 nm
CALIBRATION:
standard solutions of potassium dihydrogen phosphate (KH2PO4) (1.00 mL = 49.94 µg PH3)
RANGE:
0.3 to 10 µg per sample [2]
FLOW RATE: 0.01 - 0.2 L/min VOL-MIN: 1 L @ 0.3 ppm -MAX: 16 L SHIPMENT:
routine
SAMPLE STABILITY:
7 days @ 25 C
BLANKS:
2 to 10 field blanks per set
ESTIMATED LOD: 0.1 µg per sample [1] PRECISION ( r):
0.074 @ 2.6 to 17.4 µg per sample [2]
ACCURACY 0.195 to 0.877 mg/m3 [1] (16-L samples)
RANGE STUDIED:
0.4%
BIAS: OVERALL PRECISION ( ACCURACY:
rT):
0.091 @ 2.64 to 17.41 µg per sample [2] ± 17.6%
APPLICABILITY: The working range is 0.013 to 0.6 ppm (0.02 to 0.9 mg/m3) for a 16-L air sample. The sampler is not commercially available.
INTERFERENCES: The colorimetric determination of phosphate is subject to interference by any species that also forms a molybdate complex under these condition; possible interfering species include PCl3 and PCl5 vapors and organic phosphorous compounds.
OTHER METHODS: This revises Method S332 [2]. OSHA Method ID-180, "Phosphine in Workplace Atmospheres", [3] employing potassium hydroxide-impregnated carbon media may be used as an alternative method.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition
