Page:NIOSH Manual of Analytical Methods - 5800.pdf/1

 POLYCYCLIC AROMATIC COMPOUNDS, TOTAL (PACs)

MW: Variable METHOD: 5800, Issue 1

CAS: None

RTECS: None

EVALUATION: PARTIAL

OSHA : no PEL NIOSH: no REL ACGIH: no TLV

5800

PROPERTIES:

Issue 1: 15 January 1998

PACs are multi-numbered benzenoid-ring compounds. PACs contain polycyclic aromatic hydrocarbons (PAHs), substituted PAHs, and PAH heterocyclic derivatives.

NAMES & SYNONYMS: Total PACs as a class.

SAMPLING SAMPLER: FILTER + SOLID SORBENT (2-µm, 37-mm, PTFE filter + washed XAD-2 resin, 100/50 mg )

MEASUREMENT TECHNIQUE:

FLOW INJECTION, FLUORESCENCE DETECTOR

ANALYTE:

Polycyclic aromatic compounds as a chemical class 4 mL hexane, rotated for at least 12 hours.

FLOW RATE:

1 to 2 L/min

VOL-MIN: -MAX:

5 L @ 0.01 mg/m3 1000 L

EXTRACTION:

SHIPMENT:

Ship at @ 0 C

INJECTION VOLUME:

25 µL

SAMPLE STABILITY:

at least 30 days @ 5 C [1]

MOBILE PHASE:

100% acetonitrile at 1.5 mL/min.

BLANKS:

2 to 10 field blanks per set

CALIBRATION:

standard solutions of PACs based on Supelco QTM test mixture.

DETECTOR 1: ACCURACY RANGE STUDIED:

not studied

BIAS:

not determined

OVERALL PRECISION ( ACCURACY:

rT

):

not determined not determined

fluorescence excitation 254 nm; emission 370 nm RANGE: 0.04 to 250 µg/sample ESTIMATED LOD: 0.012 µg/sample PRECISION ( r): 0.042 @ 0.13 to 17 µg/sample [1]

DETECTOR 2:

fluorescence excitation 254 nm; emission 400 nm RANGE: 0.15 to 250 µg/sample ESTIMATED LOD: 0.05 µg/sample PRECISION ( r): 0.065 @ 0.13 to 17 µg/sample [1]

APPLICABILITY: This method is applicable for comparison of environments using the same fume source. The speciation of the PACs as a chemical class is accomplished by solid phase extraction followed by liquid-liquid extraction.

INTERFERENCES: All compounds producing detectable fluorescence at the chosen wavelengths and contained in the DMSO fraction after the sample preparation are identified as PACs.

OTHER METHODS: None identified for PACs as a class. Related methods are 2550, Benzothiazole in Asphalt Fume, by GC/sulfur chemiluminescence [2], and a gravimetric method 5042, Benzene Solubles and Total Particulate (Asphalt Fume) [3].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition