Fourier Transform Infrared Spectroscopy

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Presentation transcript:

Fourier Transform Infrared Spectroscopy November 15, 2006 CH EN 4903 Chad Wilding

Outline What is Fourier Transform Infrared (FTIR) Spectroscopy? Why use FTIR? The importance of a good baseline The analysis of aqueous sugar solutions Conclusions References

What is FTIR? Passes infrared (IR) light through an interferometer IR light passes through a sample and an interferogram is obtained A Fourier Transform is performed on the interferogram and a spectrum is defined for the sample

Diagram of a FTIR http://en.wikipedia.org/wiki/Image:Interferometer.png

Why Use the FTIR? Identify constituents of organic compounds Determine the existence of light hydrocarbon gases Analyze the concentration of aqueous sugar solutions

Obtaining the Baseline Spectra were referenced against the baseline Distilled water was used as the background Baseline needs to have virtually zero absorbance or minimal error

Analysis of Sugar Solutions D-Fructose crystals dissolved in distilled water Sucrose crystals dissolved in distilled water Sucrose is a combination of a glucose ring bonded to a fructose ring

Fructose Spectra

Sucrose Spectra

Calibration Graphs

Calibration Equations Fructose Conc.= (log(1/R)+0.0529)/0.0004 Sucrose Conc.= (log(1/R)+0.0314)/0.0003

Unknown Spectrum

Results Sucrose concentration-79.0 ± 11.7 g/L. Fructose concentration-253.5 ± 11.7 g/L. Actual sucrose concentration-60 g/L. Actual fructose concentration-240 g/L.

Conclusions

What is a Good Baseline? σ1 = 0.226 σ2 = 0.015 σ3 = 0.015

References Schwedt, Georg. The Essential Guide to Analytical Chemistry. New Jersey: Wiley and Sons, 1997. Crocker, Betty. “Chemical Engineering and Brownies,” 1971. Wikipedia. Fourier Transform Infrared Spectroscopy. http://en.wikipedia.org/wiki/fourier_transform_infred_spectroscopy. 2006

Questions and Answers