Page:NIOSH Manual of Analytical Methods - 7905.pdf/1

 PHOSPHORUS

P4

MW: 123.90

METHOD: 7905, Issue 2

7905

CAS: 7723-14-0

RTECS: TH3500000

EVALUATION: FULL

OSHA : 0.1 mg/m 3 NIOSH: 0.1 mg/m 3; Group I Pesticide ACGIH: 0.1 mg/m 3 (1 ppm = 5.07 mg/m 3 @ NTP)

Issue 1: 15 May 1989 Issue 2: 15 August 1994

PROPERTIES:

solid; d 1.83 g/mL @ 20 °C; MP 44 °C; BP 280 °C; sublimes; VP 3.5 Pa (2.6 x 10 -2 mm Hg; 172 mg/m 3) @ 20 °C; oxidizes spontaneously in air

SYNONYMS: white phosphorus; yellow phosphorus.

SAMPLING

MEASUREMENT

SAMPLER:

SOLID SORBENT TUBE (Tenax GC, 100 mg/50 mg)

TECHNIQUE:

GAS CHROMATOGRAPHY, PHOSPHORUS FPD

FLOW RATE:

0.01 to 0.2 L/min

ANALYTE:

phosphorus

VOL-MIN: -MAX:

5 L @ 0.1 mg/m 3 100 L

DESORPTION:

1 mL xylene; stand 30 min

SHIPMENT:

routine

INJECTION VOLUME:

5 µL

SAMPLE STABILITY:

7 days @ 25 °C

FIELD BLANKS:

2 to 10 field blanks per set

TEMPERATURE-INJECTION: -DETECTOR: -COLUMN: CARRIER GAS: COLUMN:

200 °C 200 °C 80 °C

He, 30 mL/min

1.8 m x 6-mm OD x 2-mm ID glass; 3% OV-101, 80/100 mesh Chromosorb WHP

ACCURACY RANGE STUDIED:

0.056 to 0.24 mg/m 3 [1] (12-L samples)

BIAS:

+ 5.5%

ˆ ): 0.090 [1] OVERALL PRECISION (S rT ACCURACY:

± 21.3%

CALIBRATION:

standard solutions of phosphorus in xylene

RANGE:

0.5 to 5 µg per sample

ESTIMATED LOD:

0.005 µg per sample [1]

ˆ ): PRECISION (S r

0.024 @ 0.6 to 2.4 µg per sample [1]

APPLICABILITY: The working range is 0.04 to 0.8 mg/m 3 (0.0008 to 0.16 ppm) for a 12-L air sample. The method is applicable to vapor-phase phosphorus only. If particulate P 4 is expected in the air sample, use a filter in the sampling train.

INTERFERENCES: None identified.

OTHER METHODS: This combines and replaces S334 [2] and P&CAM 257 [3]. P&CAM 242, utilizing impinger sampler (xylene), has not been revised [4].

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