| 光谱学与光谱分析 |
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| Laser Raman Spectrum Analysis of Carbendazim Pesticide |
| WANG Xiao-bin1, WU Rui-mei1, 2*, LIU Mu-hua1, ZHANG Lu-ling1, LIN Lei1, YAN Lin-yuan1 |
1. Optics-Electrics Application of Biomaterials Lab，College of Engineering，Jiangxi Agricultural University，Nanchang 330045，China
2. Jiangsu Key Laboratory of Physical Processing of Agricultural Product，Jiangsu University，Zhenjiang 212013，China |
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Abstract Raman signal of solid and liquid carbendazim pesticide was collected by laser Raman spectrometer. The acquired Raman spectrum signal of solid carbendazim was preprocessed by wavelet analysis method, and the optimal combination of wavelet denoising parameter was selected through mixed orthogonal test. The results showed that the best effect was got with signal to noise ratio (SNR) being 62.483 when db2 wavelet function was used, decomposition level was 2, the threshold option scheme was ‘rigrsure’ and reset mode was ‘sln’. According to the vibration mode of different functional groups, the de-noised Raman bands could be divided into 3 areas: 1 400～2 000, 700～1 400 and 200～700 cm-1. And the de-noised Raman bands were assigned with and analyzed. The characteristic vibrational modes were gained in different ranges of wavenumbers. Strong Raman signals were observed in the Raman spectrum at 619, 725, 964, 1 022, 1 265, 1 274 and 1 478 cm-1, respectively. These characteristic vibrational modes are characteristic Raman peaks of solid carbendazim pesticide. Find characteristic Raman peaks at 629, 727, 1 001, 1 219, 1 258 and 1 365 cm-1 in Raman spectrum signal of liquid carbendazim. These characteristic peaks were basically tallies with the solid carbendazim. The results can provide basis for the rapid screening of pesticide residue in food and agricultural products based on Raman spectrum.
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Received: 2013-07-31
Accepted: 2013-11-24
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Corresponding Authors:
WU Rui-mei
E-mail: wuruimei036@163.com
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