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Sampling and atomic absorption spectrometric determination of arsine at the 2 microgram/m3 level.

Authors
Denyszyn-RB; Grohse-PM; Wagoner-DE
Source
Anal Chem 1978 Jul; 50(8):1094-1096
NIOSHTIC No.
00166726
Abstract
A sampling and analytical system was developed to measure arsine (7784421) gas at the 1 to 10 micrograms/cubic meter (microg/m3) concentration level, involving collection of the gas on charcoal in glass tubes followed by electrothermal atomic absorption analysis utilizing the heated graphite furnace. The recoveries at all levels averaged between 85 and 90 percent; two separate standard solution preparation procedures were not necessary. The detection limit (twice the noise level) was 0.3microg/m3 over 15 minutes with a sample volume of 13.15 liters. When using a nickel modification procedure, mean percent recoveries for arsine loading from 0.01 to efficiency of the collection desorption process did not vary significantly, and the same calibration procedure was applicable at all levels of arsine loading. A trace metal analysis was performed on 10 milliliters of 0.01 molar nitric-acid solution after desorption of 1000 milligrams charcoal. Only magnesium was detectable and then only at the 50 parts per billion level, which is unlikely to produce an enhancement or linearizing effect. The authors suggest that the evidence points to a mechanism involving conversion of arsine to elemental arsenic on the surface of the charcoal.
Keywords
NIOSH-Publication; NIOSH-Contract; Contract-210-76-0142; Poisons; Spectrographic-analysis; Arsenic-compounds; Toxic-gases; Analytical-methods; Quantitative-analysis; Atomic-absorption-spectrometry; Trace-metals
CODEN
ANCHAM
CAS No.
7784-42-1
Publication Date
19780701
Document Type
Journal Article
Funding Type
Contract
Fiscal Year
1978
NTIS Accession No.
NTIS Price
Identifying No.
Contract-210-76-0142
Issue of Publication
8
Source Name
Analytical Chemistry
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