Page:NIOSH Manual of Analytical Methods - 1501.pdf/1

 HYDROCARBONS, AROMATIC

FORMULA: Table 1

MW: Table 1

METHOD: 1501, Issue 3

CAS: Table 1

EVALUATION: Full

Group A:

benzene

toluene

Group B:

cumene

p-tert-butyltoluene

ethylbenzene

Table 1

o-xylene

"-methylstyrene

SAMPLING SAMPLER:

SOLID SORBENT TUBE (coconut shell charcoal, 100 mg/50 mg)

FLOW RATE:

Table 3

VOL-MIN: -MAX:

Table 3 Table 3

SHIPMENT:

Routine

SAMPLE STABILITY:

30 days @ 5°C

BLANKS:

10% of samples

RTECS: Table 1 Issue 1: 15 August 1990 Issue 3: 15 March 2003

PROPERTIES:

OSHA : Table 2 NIOSH: Table 2 ACGIH: Table 2 SYNONYMS: (Synonyms in Table 1)

1501

m-xylene $-methylstyrene

p-xylene styrene

MEASUREMENT TECHNIQUE:

GAS CHROMATOGRAPHY, FID

ANALYTE:

Hydrocarbons listed above

DESORPTION:

1 mL CS2, stand 30 min with agitation

INJECTION VOLUME:

TEMPERATURE -INJECTION: -DETECTOR: -COLUMN:

1 µL (Group A: split 5:1; Group B: split 1:1)

250 °C 300 °C Group A: 40 °C (10 min) to 230°C (10 °C/min) Group B: 35°C (8 min) to 225°C (10°C/min)

CARRIER GAS:

He @ 2.6 mL/min

COLUMN:

Capillary, fused silica Group A: 30m x 0.32-mm ID; 1-µm film 100% PEG or equivalent Group B: 30m x 0.53-mm ID; 3-µm film crossbonded® 35% diphenyl 65% dimethyl polysiloxane or equivalent

CALIBRATION:

Solutions of analytes in CS 2

RANGE:

Table 4

ACCURACY RANGE STUDIED:

Table 3

BIAS:

Table 3

OVERALL PRECISION (Ö r T ):

Table 3

ACCURACY:

Table 3

ESTIMATED LOD: Table 4 PRECISION ( þ r ):

Table 4

APPLICABILITY: This method is for peak, ceiling, and TWA determinations of aromatic hydrocarbons. Interactions between analytes may reduce breakthrough volumes and affect desorption efficiencies. Naphthalene, originally validated in S292 [4], failed to meet acceptable desorption efficiency recovery and storage stability criteria at the levels evaluated in this study. However, the application of this method to naphthalene levels at or near the REL/PEL continues to meet acceptable recovery criteria. Styrene failed to meet acceptable recovery criteria at the two lowest levels evaluated in this study (highest level to meet the criteria was 181 µg/sample). INTERFERENCES: Under conditions of high humidity, the breakthrough volumes may be reduced. Other volatile organic compounds such as alcohols, ketones, ethers, and halogenated hydrocarbons are potential analytical interferences. OTHER METHODS: This method updates NMAM 1501 issued on August 15, 1994 [1] which was based upon P&CAM 127 (benzene, styrene, toluene, and xylene) [2]; S22 (p-tert-butyltoluene) [3]; S23 (cumene) [3]; S29 (ethylbenzene) [3] ; S26 ("-methylstyrene) [3]; S30 (styrene); S311 (benzene) [4]; S343 (toluene) [4]; and S318 (xylenes) [4].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition