PHOSPHORUS TRICHLORIDE
PCl3
MW: 137.33
METHOD: 6402, Issue 2
RTECS: TH3675000
EVALUATION: PARTIAL
OSHA : 0.5 ppm NIOSH: 0.2 ppm; STEL 0.5 ppm ACGIH: 0.2 ppm; STEL 0.5 ppm (1 ppm = 5.61 mg/m 3 @ NTP)
SYNONYMS:
CAS: 7719-12-2
6402
PROPERTIES:
Issue 1: 15 May 1985 Issue 2: 15 August 1994
liquid; d 1.574 g/mL @ 21 °C; BP 76 °C; MP -112 °C; VP 13 kPa (100 mm Hg; 13% v/v) @ 21 °C
phosporous chloride.
SAMPLING
MEASUREMENT
SAMPLER:
BUBBLER (15 mL H 2O)
METHOD:
FLOW RATE:
0.05 to 0.2 L/min
ANALYTE:
molybdenum blue
VOL-MIN: -MAX:
11 L @ 0.5 ppm 100 L
COLOR DEVELOPMENT:
3 mL Br 2 water + 5 mL Na 2MoO 4 + 2 mL hydrazine sulfate → molybdenum blue
SHIPMENT:
ship in sealed bubblers
SAMPLE STABILITY:
unknown
FIELD BLANKS:
2 to 10 field blanks per set
ACCURACY RANGE STUDIED:
ca. 3.1 mg/m 3 [1]
BIAS:
not significant [1]
ˆ ): OVERALL PRECISION (S rT
unknown
ACCURACY:
not determined
VISIBLE SPECTROPHOTOMETRY
WAVELENGTH:
830 nm
CALIBRATION:
KH 2PO 4 solutions
RANGE:
0.03 to 0.5 mg PCl 3 per sample
ESTIMATED LOD: 3 µg PCl 3 per sample
PRECISION (Sr):
0.06 @ 0.03 to 0.14 mg PCl 3 per sample [1]
APPLICABILITY: The working range is 0.2 to 14 ppm (1.2 to 80 mg/m 3) for a 25-L air sample.
INTERFERENCES: Phosphorus (V) compounds do not interfere. The sample solutions are stable to oxidation by air during sampling [1].
OTHER METHODS: This revises P&CAM 305 [2].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
