Page:NIOSH Manual of Analytical Methods - 2510.pdf/1

 1-OCTANETHIOL

CH3(CH2)7SH

MW: 146.29

METHOD: 2510, Issue 2

2510

CAS: 111-88-6

RTECS: None

EVALUATION: FULL

OSHA : no PEL NIOSH: C 0.5 ppm/15 min ACGIH: no TLV (1 ppm = 5.98 mg/m 3 @ NTP)

PROPERTIES:

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

liquid; d 0.843 g/mL @ 20 °C; BP 199.1 °C; MP - 49.2 C; VP 0.026

kPa (1.55 mm Hg; 2040 ppm) @ 37.7 °C

SYNONYMS: n-octanethiol; octyl mercaptan; 1-mercaptooctane; octylthiol.

SAMPLING

MEASUREMENT

SAMPLER:

SOLID SORBENT TUBE (Tenax-GC, 100 mg/50 mg)

TECHNIQUE:

GAS CHROMATOGRAPHY, SULFURSPECIFIC FPD

FLOW RATE:

0.01 to 0.2 L/min

ANALYTE:

1-octanethiol (sulfur)

VOL-MIN: -MAX:

1 L @ 0.5 ppm 15 L

DESORPTION:

2 mL acetone; 45 min ultrasonic agitation

SHIPMENT:

routine

INJECTION VOLUME:

5 µL

SAMPLE STABILITY:

at least 8 days @ 25 °C

BLANKS:

2 to 10 field blanks per set

TEMPERATURE-INJECTION: -DETECTOR: -COLUMN: CARRIER GAS:

N 2 or He, 50 mL/min

COLUMN:

1.8 m x 4-mm ID glass; 3% OV-1 on 100/120 mesh Gas-Chrom Q or equivalent

CALIBRATION:

1-octanethiol in acetone

RANGE:

3 to 64 µg per sample

ACCURACY RANGE STUDIED:

0.32 to 6.55 mg/m 3 [1] (8.5-L samples)

BIAS:

- 0.013 [1]

ˆ rT): 0.083 [1] OVERALL PRECISION (S ACCURACY:

± 17.6%

160 C 200 C 115 C

ESTIMATED LOD: 0.2 µg per sample PRECISION (Sr):

0.030 [1]

APPLICABILITY: The working range is 0.05 to 1 ppm (0.3 to 6 mg/m 3) for a 10-L air sample.

INTERFERENCES: Presence of other volatile compounds may interfere with collection of 1-octanethiol or reduce capacity of sorbent tube.

OTHER METHODS: None evaluated by NIOSH.

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