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Int. J. Environ. Res. Public Health 2018, 15(2), 312; https://doi.org/10.3390/ijerph15020312

Rapid Screening of Cadmium in Rice and Identification of Geographical Origins by Spectral Method

1
Beijing Research Center for Agricultural Standards and Testing, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
2
Beijing Municipal Key Laboratory of Agriculture Environment Monitoring, Beijing 100097, China
3
Academy of State Administration of Grain, Beijing 100037, China
*
Author to whom correspondence should be addressed.
Received: 7 January 2018 / Revised: 26 January 2018 / Accepted: 6 February 2018 / Published: 11 February 2018
(This article belongs to the Section Environmental Science and Engineering)
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Abstract

The accuracy, repeatability and detection limits of the energy-dispersive X-ray fluorescence (XRF) spectrometer used in this study were tested to verify its suitability for rapid screening of cadmium in samples. Concentrations of cadmium in rice grain samples were tested by the XRF spectrometer. The results showed that the apparatus had good precision around the national limit value (0.2 mg/kg). Raman spectroscopy has been analyzed in the discrimination of rice grain samples from different geographical origins within China. Scanning time has been discussed in order to obtain better Raman features of rice samples. A total of 31 rice samples were analyzed. After spectral data pre-treatment, principal component analysis (PCA), K-means clustering (KMC), hierarchical clustering (HC) and support vector machine (SVM) were performed to discriminate origins of rice samples. The results showed that the geographical origins of rice could be classified using Raman spectroscopy combined with multivariate analysis. View Full-Text
Keywords: X-ray fluorescence; rapid screening; Raman spectroscopy; geographical origin; rice grain X-ray fluorescence; rapid screening; Raman spectroscopy; geographical origin; rice grain
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, F.; Wang, J.; Xu, L.; Wang, S.; Zhou, M.; Yin, J.; Lu, A. Rapid Screening of Cadmium in Rice and Identification of Geographical Origins by Spectral Method. Int. J. Environ. Res. Public Health 2018, 15, 312.

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