Page:NIOSH Manual of Analytical Methods - 1400.pdf/1

 ALCOHOLS I

Table 1

MW: Table 1

METHOD: 1400, Issue 2

CAS: Table 2

1400

RTECS: Table 2

EVALUATION: PARTIAL

OSHA : Table 2 NIOSH: Table 2 ACGIH: Table 2

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

PROPERTIES: Table 1

COMPOUNDS AND SYNONYMS: (1) ethanol: ethyl alcohol. (2) isopropyl alcohol: 2-propanol. (3) tert-butyl alcohol: 2-methyl-2-propanol. SAMPLING SAMPLER:

MEASUREMENT

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

FLOW RATE: 0.01 to 0.2 L/min (≤0.05 L/min for ethyl alcohol) (2) 0.3 L 3L

(3) 1.0 L 10 L

TECHNIQUE:

GAS CHROMATOGRAPHY, FID

ANALYTE:

compounds above

DESORPTION:

1 mL 1% 2-butanol in CS 2

INJECTION VOLUME:

5 µL

VOL-MIN: -MAX:

(1) 0.1 L 1L

SHIPMENT:

cooled

TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:

SAMPLE STABILITY:

unknown, store in freezer

CARRIER GAS:

N 2 or He, 30 mL/min

BLANKS:

2 to 10 field blanks per set

COLUMN:

glass, 2 m x 4-mm ID, 0.2% Carbowax 1500 on 60/80 Carbopack C or equivalent

CALIBRATION:

solutions of analyte in eluent (internal standard optional)

ACCURACY RANGE STUDIED:

see EVALUATION OF METHOD

BIAS:

not significant [1]

ˆ ): OVERALL PRECISION (S rT METHOD ACCURACY:

RANGE AND PRECISION:

200 °C 250-300 °C 65-70 °C

see EVALUATION OF METHOD

see EVALUATION OF ESTIMATED LOD: 0.01 mg per sample [2]

± 14%

APPLICABILITY: The working ranges are 16 to 1000 ppm ethanol (30 to 1900 mg/m 3) for a 1-L air sample; 4 to 400 ppm isopropyl alcohol (10 to 1000 mg/m 3) for a 3-L air sample; and 1 to 100 ppm t-butyl alcohol (3 to 300 mg/m 3) for a 10-L air sample. This method employs a simple desorption and may be used to determine two or more analytes simultaneously by varying GC conditions (e.g., temperature programming).

INTERFERENCES: High humidity reduces sampling efficiency. The methods were validated using a 3 m x 3-mm stainless steel column packed with 10% FFAP on Chromosorb W-AW; other columns with equal or better resolution (e.g., capillary) may be u sed. Less volatile compounds may displace more volatile compounds on the charcoal.

OTHER METHODS: This method combines and replaces Methods S56, S65 and S63 [3].

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