Page:NIOSH Manual of Analytical Methods - 6008.pdf/1

 STIBINE

SbH3

MW: 124.77

METHOD: 6008, Issue 2

CAS: 7803-52-3

6008

RTECS: WJ0700000

EVALUATION: FULL

OSHA : 0.1 ppm NIOSH: 0.1 ppm/10 h ACGIH: 0.1 ppm (1 ppm = 5.10 mg/m 3 @ NTP)

PROPERTIES:

Issue 1: 15 August 1987 Issue 2: 15 August 1994

gas; BP -17 °C; MP -88 °C; VP >1 atm

SYNONYMS: antimony trihydride

SAMPLING SAMPLER:

SOLID SORBENT TUBE (HgCl 2-coated silica gel, 1 g/0.5 g)

FLOW RATE:

0.01 to 0.2 L/min

VOL-MIN: -MAX:

4L 50 L

SHIPMENT:

routine

SAMPLE STABILITY:

at least 7 days @ 25 °C [1]

BLANKS:

2 to 10 field blanks per set

MEASUREMENT TECHNIQUE:

VISIBLE SPECTROPHOTOMETRY

ANALYTE:

antimony

EXTRACTION:

15 mL conc. HCl; 30 min

WAVELENGTH:

552 NM

CALIBRATION:

standard solutions of Sb(III) in conc. HCl

RANGE:

2 to 20 µg Sb per sample [1]

ESTIMATED LOD: 0.4 µg SbH 3 per sample [1] PRECISION (Sr):

not defined

ACCURACY RANGE STUDIED:

0.12 to 1 mg/m 3 [1] (20-L samples)

BIAS:

-1.4%

ˆ ): 0.087 [1] OVERALL PRECISION (S rT ACCURACY:

± 17.0%

APPLICABILITY: The working range is 0.1 to 3.5 mg/m 3 (0.02 to 0.7 ppm) for a 20-L air sample.

INTERFERENCES: Colorimetric determination of Sb is subject to interference by elements which form a Rhodamine B complex extractable into isopropyl ether. Am(III) (>250 µg); Au (>1000 µg); Fe(III) (>30,000 µg); Tl(I) (>1000 µg); and Sn(II) ( >1000 µg) interfere [2]. If the possibility of an interference exists, an alternate measurement procedure should be used (e.g., IC P or AAS).

OTHER METHODS: This revises Method S243 [3].

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