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Ph. D. ThesisPh. D. Thesis 9. Results  All Data Sets9. Results All Data Sets 9.2. Methanol, Ethanol and 1-Propanol by SPR9.2. Methanol, Ethanol and 1-Propanol by SPR 9.2.1. Single Analytes9.2.1. Single Analytes
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Ph. D. Thesis
  Abstract
  Table of Contents
  1. Introduction
  2. Theory Fundamentals of the Multivariate Data Analysis
  3. Theory Quantification of the Refrigerants R22 and R134a: Part I
  4. Experiments, Setups and Data Sets
  5. Results Kinetic Measurements
  6. Results Multivariate Calibrations
  7. Results Genetic Algorithm Framework
  8. Results Growing Neural Network Framework
  9. Results All Data Sets
    9.1. Methanol and Ethanol by SPR
    9.2. Methanol, Ethanol and 1-Propanol by SPR
      9.2.1. Single Analytes
      9.2.2. Multivariate Calibrations of the Mixtures
      9.2.3. Genetic Algorithm Framework
      9.2.4. Parallel Growing Neural Network Framework
      9.2.5. PCA-NN
      9.2.6. Conclusions
    9.3. Methanol, Ethanol and 1-Propanol by the RIfS Array and the 4l Setup
    9.4. Quaternary Mixtures by the SPR Setup and the RIfS Array
    9.5. Quantification of the Refrigerants R22 and R134a in Mixtures: Part II
  10. Results Various Aspects of the Frameworks and Measurements
  11. Summary and Outlook
  12. References
  13. Acknowledgements
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9.2.1.   Single Analytes

The sensor responses for the measurements of different concentrations of the 3 analytes are plotted in figure 16 (section 4.5.2.2) during 600 seconds of sorption and a subsequent desorption. The sensor reacts spontaneously to the presence and absence of methanol vapors resulting in a rectangular shape along the time axis. The sensor response for ethanol is slower resulting in shapes, which are more curved, whereas the sorption of 1-propanol into the sensitive polymer layer is very slow not reaching equilibrium between the vapors of 1-propanol and the 1-propanol sorbed into the polymer layer. Therefore, the shape of the sensor response for 1-propanol does not reach a plateau during sorption and the signals need a long time to come down to the baseline during desorption.

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