Page:NIOSH Manual of Analytical Methods - 2530.pdf/1

 DIPHENYL

C 6H 5C 6H 5

MW: 154.21

METHOD: 2530, Issue 2

CAS: 92-52-4

2530

RTECS: DU8050000

EVALUATION: FULL

OSHA : 0.2 ppm NIOSH: 0.2 ppm ACGIH: 0.2 ppm (1 ppm = 6.30 mg/m 3 @ NTP)

PROPERTIES:

Issue 1: 15 August 1987 Issue 2: 15 August 1994

MP 69 °C; BP 255 °C VP 8 Pa (0.06 mm Hg; 79 ppm) @ 25 °C; flash point 113 °C

SYNONYMS: biphenyl

SAMPLING SAMPLER:

SOLID SORBENT TUBE (Tenax GC, 20 mg/10 mg))

FLOW RATE:

0.01 to 0.5 L/min

VOL-MIN: -MAX:

15 L @ 0.2 ppm 30 L

SHIPMENT:

routine

SAMPLE STABILITY:

95% recovery after 7 days @ room temperature

FIELD BLANKS:

2 to 10 field blanks per set

MEASUREMENT TECHNIQUE:

GAS CHROMATOGRAPHY, FID

ANALYTE:

diphenyl

DESORPTION:

1 mL CCl 4, stand 15 min

INJECTION VOLUME: 5 µL TEMPERATURE-INJECTION: -DETECTOR: -COLUMN: CARRIER GAS:

N 2, 50 mL/min

COLUMN:

1.8 m x 4-mm ID glass packed with 5% OV-17 on 80/100 mesh Chromosorb W

CALIBRATION:

standard solutions of biphenyl in CCl 4

RANGE:

4 to 120 µg per sample

ACCURACY RANGE STUDIED: BIAS:

0.64 to 2.4 mg/m 3 [1] (30-L samples) - 6.4%

ˆ ): 0.068 [1] OVERALL PRECISION (S rT ACCURACY:

225 °C 250 °C 135 °C

ESTIMATED LOD: 0.09 µg per sample [1] PRECISION (Sr):

0.019 [1] @ 19 to 76 µg per sample

± 15.33%

APPLICABILITY: The working range is 0.02 to 0.63 ppm (0.13 to 4 mg/m 3 ) for a 30-L air sample. concentrations down to 0.01 mg/m 3 may be possible if the desorption efficiency remains adequate.

INTERFERENCES: None identified.

OTHER METHODS: This revises Method S24 [2].

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

Measurement of