The Electronic Nose:
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1 The Electronic Nose: A Multivariate Approach
description
The Electronic Nose:. A Multivariate Approach. The tasks of this report:. To inform on chemometrics studies in Voronezh To describe the results of one research project. Igor V. Aristov Department of Analytical Chemistry Voronezh State University. Tatyana A. Kuchmenko - PowerPoint PPT Presentation
Transcript of The Electronic Nose:
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The Electronic Nose:
A Multivariate Approach
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The tasks of this report:
To inform on chemometrics studies in Voronezh
To describe the results of one research project
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Authors:
Igor V. Aristov• Department of
Analytical Chemistry• Voronezh State
University
Tatyana A. Kuchmenko• Department of Analytical
Chemistry• Voronezh State
Technological Academy
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Scientific interests
Analytical Chemistry Electrochemistry Separation methods Applied Statistics
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The Problem
We want to distinguish vapors of chemical substances in air using a cross-selectivity multisensor detector
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The “Electronic Nose”
Unit for gas analysis with many cross-selectivity sensors.
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The “Electronic Nose”: a scheme
GAS
Input
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Experimental equipment
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Scheme of Analytical Information
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Electronic Nose with 14 cross-selectivity sensors
Sorbates Benzol Aniline o-Methyl Aniline m-Methyl Aniline p-Methyl Aniline
Analytical signals F; frequency difference a; capacity t0.5; time of half sorption
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Vapor Print TM
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0,5
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Benzol
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Aniline
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о-Methyl Aniline
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м- Methyl Aniline
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п- Methyl Aniline
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Vapor Print TM
Benzol Aniline
о-Methyl Aniline м- Methyl Aniline
п- Methyl Aniline
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Discriminant Analysis
Discriminant function Variable D1 D2 D3
t0.5 -0,99 0,10 0,06 F -0,14 -1,07 0,41 a -0,07 0,20 -1,14
Explained Variance, %
95,9 3,9 0,2
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Discriminant Analysis
Means Sorbate D1 D2
о-Methyl Aniline -8.71 -0.56 Benzol 9.39 -1.60 p-Methyl Aniline 4.30 2.10 m-Methyl Aniline 0.20 -0.86 Aniline 5.72 -0.20
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Classification
Group % о-Methyl Aniline
Benzol p-Methyl Aniline
m-Methyl Aniline
Aniline
о-Methyl Aniline
33,3 14 4 1 18 5
Benzol 47,6 0 20 11 5 6 p-Methyl Aniline
92,9 1 0 39 2 0
m-Methyl Aniline
52,4 9 1 7 22 3
Aniline 28,6 3 8 16 3 12 All 51,0 27 33 74 50 26
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Scheffe test (t0.5)
Homogeneous Group (p=0.05)
Sorbate Mean
1 2 3 4 5 Benzol -0,34 Aniline -0,20 p-Methyl Aniline
-0,14
m-Methyl Aniline
-0,01
о-Methyl Aniline
0,30
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Scheffe test (F)
Homogeneous Group (p=0.05)
Sorbate Mean
1 2 3 4 Benzol -1,01 Aniline -0,20 p-Methyl Aniline 0,23 m-Methyl Aniline 0,37
о-Methyl Aniline 0,62
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Scheffe test (a)
Homogeneous Group (p=0.05)
Sorbate Mean
1 2 3 Benzol -0,45 Aniline -0,39
p-Methyl Aniline -0,07
m-Methyl Aniline 0,40 о-Methyl Aniline 0,52
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In The Nearest Future
Optimization of sensors number Multivariate calibration
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The End
