Author: Donald P. Tuchman
Publisher:
ISBN:
Category : Air filters
Languages : en
Pages : 24
Book Description
The U.S. Bureau of Mimes 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-pg 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
Research Toward Direct Analysis of Quartz Dust on Filters Using FTIR Spectroscopy
Author: Donald P. Tuchman
Publisher:
ISBN:
Category : Air filters
Languages : en
Pages : 24
Book Description
The U.S. Bureau of Mimes 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-pg 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
Publisher:
ISBN:
Category : Air filters
Languages : en
Pages : 24
Book Description
The U.S. Bureau of Mimes 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-pg 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
Research toward direct analysis of quartz dust on filters using FTIR spectroscopy
Author: Donald P. Tuchman
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Monthly Catalog of United States Government Publications
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1308
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1308
Book Description
New Publications
Author: United States. Bureau of Mines
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 654
Book Description
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 654
Book Description
Bureau of Mines Research
Author: United States. Bureau of Mines
Publisher:
ISBN:
Category : Fuel
Languages : en
Pages : 168
Book Description
Publisher:
ISBN:
Category : Fuel
Languages : en
Pages : 168
Book Description
Information Circular
Author:
Publisher:
ISBN:
Category : Mines and mineral resources
Languages : en
Pages : 602
Book Description
Publisher:
ISBN:
Category : Mines and mineral resources
Languages : en
Pages : 602
Book Description
User's Guide for Inslope3
Author: James P. May
Publisher:
ISBN:
Category : Inslope3
Languages : en
Pages : 614
Book Description
Publisher:
ISBN:
Category : Inslope3
Languages : en
Pages : 614
Book Description
List of Bureau of Mines Publications and Articles ... with Subject and Author Index
Author: United States. Bureau of Mines
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 150
Book Description
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 150
Book Description
Bureau of Mines Publications and Articles ... (with Subject and Author Index)
Author: United States. Bureau of Mines
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 150
Book Description
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 150
Book Description
Government Reports Annual Index
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1400
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1400
Book Description