Page:NIOSH Manual of Analytical Methods - 5042.pdf/1

 BENZENE-SOLUBLE FRACTION AND TOTAL PARTICULATE (ASPHALT FUME) MW: variable

CAS:

8052-42-4 asphalt;

RTECS: CI990000, asphalt;

none, asphalt fume METHOD: 5042, Issue 1

none, asphalt fume

EVALUATION: PARTIAL

OSHA: No PEL NIOSH: C 5 mg/m3 (15-min) as total particulates ACGIH: 5 mg/m3

5042

Issue 1: 15 January 1998

PROPERTIES: not defined

SYNONYMS: bitumen fumes SAMPLING SAMPLER:

FILTER (tared 37-mm, 2-µm, PTFE filter)

FLOW RATE:

1 to 4 L/min

VOL-MIN: -MAX:

28 L @ 5 mg/m3 400 L @ 5 mg/m3

SHIPMENT:

routine

SAMPLE STABILITY:

not determined

BLANKS:

5 field blanks per day

ACCURACY

MEASUREMENT TECHNIQUE:

GRAVIMETRIC

ANALYTE:

Airborne total particulate (TP) material and the benzene-soluble fraction (BSF)

EXTRACTION:

3 mL benzene; ultrasonic bath, 20 minutes

BALANCE:

0.001 mg sensitivity; use same balance, if practical, before and after sample collection

CALIBRATION:

Check and maintain calibration of balance according to manufacturer’s recommendations

RANGE:

TP: 0.13 to 2 mg per sample BSF: 0.14 to 2 mg per sample

ESTIMATED LOD: TP: 0.04 mg per sample BSF: 0.04 mg per sample

RANGE STUDIED: not determined PRECISION ( r): BIAS: OVERALL PRECISION ( ACCURACY:

not determined

rT):

TP: 0.048 at BSF: 0.061 at

0.10 mg per sample 0.21 mg per sample

not determined not determined

APPLICABILITY: The working range is 0.14 to 2 mg/m3 for a 1000-L sample. The method is applicable to 15-minute samples. The method was evaluated for asphalt fume; however, it is nonspecific and determines the concentrations of total particulate and the soluble fraction of the total particulate to which a worker is exposed. Therefore, for each sample matrix collected other than asphalt fume, a surrogate standard must be selected and spiked onto sampling media. These spiked samples will be used to determine recoveries, precision, and accuracy, also LOD and LOQ if necessary; moreover, other solvents besides benzene can be evaluated. The particle size of the particulate should be less than 40 µm, and preferably less than 30 µm. If particle sizes are larger than this, another sampler should be used.

INTERFERENCES: Changes in temperature or humidity during pre- and post-collection weighing may affect accuracy. A controlled laboratory environment is needed to exclude positive interferences due to dust contamination. Losses may occur from air stripping or volatilization of a collected sample during sampling, shipping, or analysis.

OTHER METHODS: The total particulate portion of this method is based on NMAM 0500 [1]. Other methods applicable to asphalt fume are NMAM 5800, Polycyclic Aromatic Compounds [2], and NMAM 2550, Benzothiazole in Asphalt Fume [3].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition