| 光谱学与光谱分析 |
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| Rapid Detection of Dichlorvos in Chlorpyrifos by Mid-Infrared and Near-Infrared Spectroscopy |
| GAO Xin, WANG Xin-yu, WANG Dong, HAO Xiang-hong, MIN Shun-geng* |
| Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, China |
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Abstract In the present study, the content of dichlorvos in chlorpyrifos was rapidly determined by mid-infrared and near-infrared spectroscopy. The quantitative models were established by partial least squares (PLS) method and optimized. The independent validation sets and 7 test samples were used to evaluate the model accuracy. The results showed that mid-infrared and near-infrared spectroscopy can accurately determine the content of dichlorvos in chlorpyrifos. The RMSEC (the root mean square error of calibration) of the mid-infrared model and near-infrared model was 0.013 and 0.020, respectively. R2 (determination coefficient) both were 1.000. For 7 test samples, RMSEP before model recalibration is 0.22 (MIRS) and 0.09 (NIRS). The adaptability of the near-infrared model was much better and model updating was unnecessary. To sum up, MIR and NIR are both rapid and easy-operation method with simple pretreatment.
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Received: 2009-12-08
Accepted: 2010-03-12
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Corresponding Authors:
MIN Shun-geng
E-mail: minsg@263.net
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