PYRIDINE
C5H5N
MW: 79.10
METHOD: 1613, Issue 2
CAS: 110-86-1
1613
RTECS: UR8400000
EVALUATION: FULL
OSHA : 5 ppm NIOSH: 5 ppm; Group III Pesticide ACGIH: 5 ppm (1 ppm = 3.23 mg/m 3 @ NTP)
PROPERTIES:
Issue 1: 15 August 1987 Issue 2: 15 August 1994
liquid; d 0.982 g/mL @ 20 °C; BP 115 °C; MP -42 °C; VP 2.4 kPa (18 mm Hg; 2.4% v/v) @ 20 °C; explosive limits 1.8 to 12.4% v/v in air
SYNONYMS: azine; azabenzene
SAMPLING SAMPLER:
SOLID SORBENT TUBE (coconut shell charcoal, 100 mg/50 mg)
MEASUREMENT TECHNIQUE:
GAS CHROMATOGRAPHY, FID
ANALYTE:
pyridine
FLOW RATE:
0.01 to 1.0 L/min
DESORPTION:
1 mL methylene chloride; stand 30 min
VOL-MIN: -MAX:
18 L 150 L
INJECTION VOLUME:
5 µL
SHIPMENT:
routine
SAMPLE STABILITY:
TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:
not determined
FIELD BLANKS:
2 to 10 field blanks per set
CARRIER GAS:
260 °C 285 °C 140 °C
N 2, 30 mL/min
COLUMN:
3 m x 3-mm OD stainless steel packed with 5% Carbowax 20M on 80/100 mesh acid-washed DMCS Chromosorb W
CALIBRATION:
standard solutions methylene chloride
RANGE:
0.3 to 4.5 mg per sample
ACCURACY RANGE STUDIED:
7.6 to 30 mg/m 3 [1] (100-L samples)
BIAS:
9.2%
ˆ rT): 0.059 [1] OVERALL PRECISION (S ACCURACY:
± 19.8%
of
pyridine
in
ESTIMATED LOD: 0.02 mg per sample [2] PRECISION (Sr):
0.014 @ 0.8 to 3.1 mg per sample [1]
APPLICABILITY: The working range is 1 to 14 ppm (3 to 45 mg/m 3) for a 100-L air sample.
INTERFERENCES: None detected. The chromatographic column or separation may be changed to circumvent interference problems (e.g., 30 m x 0.32-mm capillary column with 1 µm DB-5 at 50 °C [2]).
OTHER METHODS: This revises Method S161 [3].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
