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Investigation of the Determination of Respirable Quartz on Filter Media Using Fourier Transform Infrared Spectrophotometry.

PB90130105

Publication Date	1989
Personal Author	Lorberau, C.
Page Count	76
Abstract	The use of Fourier transform infrared spectrophotometry for the determination of quartz in respirable dust directly on filter media was investigated. Fifteen different 25-mm filters which might be used in a respirable dust sampler were examined. With the best of these, the limit of detection in practical operating conditions (three times the standard deviation of the blank) was estimated to be 3 micrograms with linearity in excess of 1 mg. The spatial inhomogeneity of the filter background appears to be a limiting factor to the sensitivity. Procedures were devised to correct for the filter background and the absorbance of relatively non-structured interferences, such as coal dust. In addition, two methods to correct for the interference of the overlapping absorbance bands of other minerals (kaolinite, cristobalite) with those of quartz were also studied. Scaled spectral subtraction of reference spectra of the interferences provided results that did not differ significantly from those which were obtained by a more traditional approach. Both methods overcorrected for the presence of the interference. The absorbance signal per unit weight of quartz was observed to be influenced by particle size within the respirable range.
Keywords	Coal dust Quartz Infrared spectroscopy Air pollution Fourier analysis Filtration Graphs(Charts) Sensitivity Sampling Cristobalite Kaolinite Particle size Occupational exposure Risk factors
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 68A - Air Pollution & Control 99A - Analytical Chemistry
Corporate Authors	National Inst. for Occupational Safety and Health, Cincinnati, OH. Div. of Physical Sciences and Engineering.
Document Type	Technical Report
NTIS Issue Number	199006

Investigation of the Determination of Respirable Quartz on Filter Media Using Fourier Transform Infrared Spectrophotometry.

Investigation of the Determination of Respirable Quartz on Filter Media Using Fourier Transform Infrared Spectrophotometry.
PB90130105

Publication Date	1989
Personal Author	Lorberau, C.
Page Count	76
Abstract	The use of Fourier transform infrared spectrophotometry for the determination of quartz in respirable dust directly on filter media was investigated. Fifteen different 25-mm filters which might be used in a respirable dust sampler were examined. With the best of these, the limit of detection in practical operating conditions (three times the standard deviation of the blank) was estimated to be 3 micrograms with linearity in excess of 1 mg. The spatial inhomogeneity of the filter background appears to be a limiting factor to the sensitivity. Procedures were devised to correct for the filter background and the absorbance of relatively non-structured interferences, such as coal dust. In addition, two methods to correct for the interference of the overlapping absorbance bands of other minerals (kaolinite, cristobalite) with those of quartz were also studied. Scaled spectral subtraction of reference spectra of the interferences provided results that did not differ significantly from those which were obtained by a more traditional approach. Both methods overcorrected for the presence of the interference. The absorbance signal per unit weight of quartz was observed to be influenced by particle size within the respirable range.
Keywords	Coal dust Quartz Infrared spectroscopy Air pollution Fourier analysis Filtration Graphs(Charts) Sensitivity Sampling Cristobalite Kaolinite Particle size Occupational exposure Risk factors
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 68A - Air Pollution & Control 99A - Analytical Chemistry
Corporate Authors	National Inst. for Occupational Safety and Health, Cincinnati, OH. Div. of Physical Sciences and Engineering.
Document Type	Technical Report
NTIS Issue Number	199006