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Rapid Detection of Omethoate Pesticide Residues in Chinese
Cabbage Based on Colorimetric Spectroscopy and SVM
LI Wen1 ,摇 LI Minzan2 ,摇 SUN Ming2
(1. School of Computer and Information Engineering, Beijing Technology and Business University ,
Beijing 100048,China ;
2 . Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education,
China Agricultural University,Beijing 100083, China)
Abstract: In order to fast and safely detect omethoate pesticide residues in Chinese cabbage, PdCl2 dis鄄
solved in acetic acid was used as the colorimetric reagent to have colorimetric reaction with omethoate and
the region of 300 - 1 100 nm was applied. The mixture of omethoate pesticide and Chinese cabbage juice
was extracted using ethanol. The results of 60 samples with the concentration between 0郾 5 mg / kg and 400
mg / kg showed that shape of absorbance spectra was changed and a poor correlation between the absor鄄
bance and concentration was obtained when the concentration was higher than 50 mg / kg. When the con鄄
centration was higher than 90 mg / kg, a worse correlation between the absorbance and concentration was
obtained. Three classification modeling was established by support vector machine (SVM) . The classifi鄄
cation accuracy of the validation set by 5鄄fold cross validation was up to 96郾 774 2% when the absorbance
data were normalized to [0,1] and radial basis function (RBF) was used as kernel function. This meth鄄
od provided a feasible method for rapid qualitative detection of omethoate concentration.
Key words: omethoate; pesticide residues; SVM; colorimetric reaction
( 责任编辑:檀彩莲)
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