Page:NIOSH Manual of Analytical Methods - 5026.pdf/1

 OIL MIST, MINERAL Cn H2n+2 where n $ 16

MW: not pertinent

METHOD: 5026, Issue 2

5026

CAS: 8012-95-1

EVALUATION: FULL

OSHA : 5 mg/m3 NIOSH: 5 mg/m3 ; STEL 10 mg/m3 ACGIH: 5 mg/m3 (as sampled by a method which does not collect vapor)

RTECS: PY8030000 Issue 1: 15 August 1987 Issue 2: Rev.: 15 May 1996

PROPERTIES: liquid; d 0.8 to 0.9 g/mL @ 20 °C; BP 360 °C; vapor pressure negligible

SYNONYMS: airborne mist of white mineral oil or the following water-insoluble petroleum-based cutting oils: cable oil; cutting oil; drawing oil; engine oil; heat-treating oils; hydraulic oils; machine oil; transformer oil

SAMPLING SAMPLER:

FLOW RATE:

MEASUREMENT

MEMBRANE FILTER (37-mm diameter, 0.8-:m MCE, 5-:m PVC, 2-:m PTFE, or glass fiber)

TECHNIQUE:

INFRARED SPECTROPHOTOMETRY

ANALYTE:

mineral oil

1 to 3 L/min

EXTRACTION:

10 mL CCl4

IR SCAN:

3200 to 2700 cm-1 vs. blank CCl4

CALIBRATION:

standard solutions of mineral oil in CCl4

RANGE:

0.1 to 2.5 mg per sample

3

VOL-MIN: -MAX:

20 L @ 5 mg/m 500 L

SHIPMENT:

routine

SAMPLE STABILITY:

stable

ESTIMATED LOD: 0.05 mg per sample [3]

BLANKS:

2 to 10 field blanks per set

PRECISION ( þ r ):

0.05 [3]

ACCURACY RANGE STUDIED:

2.5 to 11.7 mg/ m3 [1] (100-L samples)

BIAS:

- 0.84% [1,2]

OVERALL PRECISION (Ö rT ): 0.065 [1] ACCURACY:

± 11.8 %

APPLICABILITY: The working range is 1 to 20 mg/m3 for 100-L air sample. This method is applicable to all trichlorofluoroethane-soluble mineral oil mists, but not to (nor does OSHA’s standard cover) semi-synthetic or synthetic cutting fluids. INTERFERENCES: Any aerosol (e.g., tobacco smoke) which absorbs infrared radiation near 2950 cm-1 interferes.

OTHER METHODS: This revises P&CAM 283 [3]. P&CAM 159 [4] and S272 [5] use similar samplers with measurement by fluorescence spectrophotometry. These methods have not been revised because of limited applicability (i.e., not all mineral oils contain fluorescent components and other fluorescent compounds interfere). Infrared analysis overcomes both of these limitations.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition