Spectroscopic sample holder and method for using same
First Claim
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1. A method for spectroscopically analyzing a sample, said method consisting essentially of:
- a) providing a sample holder consisting essentially of a microporous polymeric sheet, at least a portion of said sheet being an exposed transit area for placement of a sample thereon, said sheet being substantially flat across said transit area and having an average baseline transmittance of at least 1 percent and having a plurality of interconnecting microscopic pores opening through at least one face of said sheet, said pores ranging from about 0.1 to about 50 microns in width in their average characteristic width;
b) applying said sample to said transit area of said sheet;
c) transmitting infrared radiation through said sample and said sheet; and
d) analyzing the radiation transmitted through said sample and said sheet in a spectral region of interest.
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Abstract
A sample holder for use in infrared spectrophotometric analysis. The holder comprises a microporous sheet and is particularly useful for analysis of solutions, colloids, small particle solids, flowable solids, solvents, and viscous fluids. The microporous sheet preferably has a low absorbance (high spectral transmittance) in infrared wavelengths. The sample holder is especially useful for the analysis of aqueous based samples. Also, a method for using such sample holders for infrared spectrophotometric analysis.
132 Citations
18 Claims
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1. A method for spectroscopically analyzing a sample, said method consisting essentially of:
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a) providing a sample holder consisting essentially of a microporous polymeric sheet, at least a portion of said sheet being an exposed transit area for placement of a sample thereon, said sheet being substantially flat across said transit area and having an average baseline transmittance of at least 1 percent and having a plurality of interconnecting microscopic pores opening through at least one face of said sheet, said pores ranging from about 0.1 to about 50 microns in width in their average characteristic width; b) applying said sample to said transit area of said sheet; c) transmitting infrared radiation through said sample and said sheet; and d) analyzing the radiation transmitted through said sample and said sheet in a spectral region of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for spectroscopically analyzing a sample, said method consisting essentially of:
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a) providing a sample holder consisting essentially of a microporous polymeric sheet, at least a portion of said sheet being an exposed transit area for placement of a sample thereon, said sheet having an average baseline transmittance of at least 1 percent and having a plurality of interconnecting microscopic pores opening through at least one face of said sheet, said pores ranging from about 0.1 to about 50 microns in width in their average characteristic width said sheet having pores opening through only one face thereof; b) applying said sample to said transit area of said sheet, said sample being applied to said face through which said pores open; c) transmitting infrared radiation through said sample and said sheet; and d) analyzing the radiation transmitted through said sample and said sheet in a spectral region of interest.
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Specification