Page:NIOSH Manual of Analytical Methods - 1550.pdf/1

 NAPHTHAS

Table 1

MW: Table 1

METHOD: 1550, Issue 2

CAS: Table 1

1550

RTECS: Table 1

EVALUATION: FULL

OSHA : Table 1 NIOSH: Table 1 ACGIH: Table 1

Issue 1: 15 February 1984 Issue 2: 15 August 1994

PROPERTIES: Table 1

SYNONYMS: Petroleum ether (benzin), rubber solvent, petroleum naphtha, VM&P naphtha, mineral spirits, Stoddard solvent, kerosene (kerosine), coal tar naphtha. SAMPLING

MEASUREMENT

SAMPLER:

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

FLOW RATE:

0.01 to 0.2 L/min

VOL-MIN: -MAX:

1.3 L @ 400 mg/m 3; 0.2 L @ 2500 mg/m 3 20 L @ 400 mg/m 3; 3.2 L @ 2500 mg/m 3

SHIPMENT:

routine

TECHNIQUE:

GAS CHROMATOGRAPHY, FID

ANALYTE:

naphtha hydrocarbons

DESORPTION:

1 mL CS 2; stand 30 min

INJECTION VOLUME: 5 µL (packed column); 0.1 to 1 µL (capillary column)

SAMPLE STABILITY:

at least 1 week @ 25 °C

TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:

BLANKS:

2 to 10 field blanks per set

CARRIER GAS:

N 2 or He, 30 mL/min

BULK SAMPLE:

required; 5 to 10 mL

COLUMN:

glass, 3 m x 6-mm, 10% SP-2100 on Supelcoport 80/100 or 30-m fused silica capillary, 0.325-mm ID, 1.0-µm DB-1 or equivalent

ACCURACY

200 to 250 °C 250 to 300 °C 50 to 250 °C @ 8 °/min

RANGE STUDIED:

see EVALUATION OF METHOD

CALIBRATION:

solutions of bulk naphtha in CS 2

BIAS:

see EVALUATION OF METHOD

RANGE:

0.5 to 10 mg per sample [2,3,4]

ˆ ): OVERALL PRECISION (S rT ACCURACY:

0.05 [1]

see EVALUATION OF METHOD

ESTIMATED LOD: 0.1 mg per sample PRECISION (Sr):

0.01 [1]

APPLICABILITY: The working range is 100 to 2000 mg/m 3 for a 5-L air sample. This is a general procedure for analysis of various types of hydrocarbon mixtures called "naphthas" which are used as thinners in paints and varnishes and as genera l purpose solvents.

INTERFERENCES: Most naphthas are quite complex. The components elute over a wide temperature range by gas chromatography, making interferences from other substances possible. Columns and conditions must be chosen to obtain the desired degree of separation for a given mixture.

OTHER METHODS: This method combines and replaces Methods S86 [2], S380 [3] and S382 [4]. A similar method appears in the criteria document [5].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94