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Zhao X.,Beijing Academy of Agriculture and Forestry Sciences | Zhao X.,Beijing Key and Open Laboratory of Information Technology in Agriculture | Zheng W.,Beijing Academy of Agriculture and Forestry Sciences | Zheng W.,Beijing Key and Open Laboratory of Information Technology in Agriculture | And 4 more authors.
Optik | Year: 2013

PtOEP has been used in dissolved oxygen sensors as excellent indicators for its good fluorescent properties. In this paper, we mainly studied the temperature effect on the PtOEP embedded in sol-gel film after confirming that the fluorescence emitted from PtOEP can be quenched by oxygen, and found the fluorescence intensity of PtOEP decreased with the rise of temperature. Then a quadratic polynomial which can be a good description of the relationship between the fluorescence intensity and temperature was given out. At last, analysis of the temperature influence on the dissolved oxygen sensor precision was presented. © 2013 Elsevier GmbH. All rights reserved. Source


Jiao L.,Beijing Academy of Agriculture and Forestry Sciences | Jiao L.,Beijing Key and Open Laboratory of Information Technology in Agriculture | Dong D.,Beijing Academy of Agriculture and Forestry Sciences | Dong D.,Beijing Key and Open Laboratory of Information Technology in Agriculture | And 8 more authors.
Optik | Year: 2014

As one worldwide used agent for fungi control in the fruit and vegetable field, thiophanate-methyl has been constituted a significant health risk. To determinate thiophanate-methyl, the method using UV absorption spectra based on multiple liner regression is used. Principal absorption wavelengths related closely with thiophanate-methyl ethanol solution are confirmed through analyzing the absorption spectra of thiophanate-methyl. Utilizing multiple linear regression, mathematical model between absorbance obtained from fourteen absorption wavelengths and thiophanate-methyl concentration is established. The result shows concentrations between the predicted values and measured values are well coincident and the related coefficient is 0.9853 over the concentration range 2-35 ppm. © 2013 Elsevier GmbH. Source

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