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
