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Research toward direct analysis of quartz dust on filters using FTIR spectroscopy.

Authors
Tuchman-DP
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9309, 1992 Jan; :1-17
NIOSHTIC No.
10011229
Abstract
The U.S. Bureau of Mines is investigating fourier transform infrared (FTIR) spectroscopy for on-filter quartz analysis of respirable dust. A custom accessory is described for full-face examination of filters utilizing a large-diameter infrared (IR) beam. The accessory positions samples to match diameters with that of the diverging analytical beam. Sample absorbance is then measured. With nonuniform deposition of dust on collection filters being a major issue for such analyses, this approach is the most direct way to accomplish sample area averaging. The approach is unconventional since it utilizes large-beam geometries instead of the usually desired minimized beam dimensions. The issues and problems involved in the analysis of quartz on a filter matrix are discussed. Absorption bands chosen, light-scattering effects, curved baselines, random noise, interference fringes, and possible solutions to technical difficulties are the topics covered. The more significant findings include a 20-ug detection limit for quartz when the custom accessory is used and minimal occurrence of light-scattering effects at low wavenumbers. The custom accessory performance was satisfactory and merits further work. With continued research, an on-filter method for quartz analysis of respirable dusts seems achievable.
Keywords
Mining-industry; Sampling-methods; Sampling-equipment; Samplers; Dust-samplers; Dusts; Quartz-dust; Respirable-dust; Respirators; Filters; Particulate-dust; Spectrographic-analysis
CAS No.
14808-60-7
Publication Date
19920101
Document Type
IH; Information Circular
Fiscal Year
1992
NTIS Accession No.
PB92-193440
NTIS Price
A03
Identifying No.
IC-9309
NIOSH Division
PRC
Priority Area
Other Occupational Concerns
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9309
State
PA
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