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| Feasibility of Analyzing Cr in Rice Husk and Coarse Rice with LIBS |
| WANG Cai-hong, HUANG Lin, CHEN Tian-bing, LIU Mu-hua, YANG Hui, HU Hui-qin , YAO Ming-yin* |
| Optic-Electrics Application of Biomaterials Laboratory，Jiangxi Agricultural University，Nanchang 330045，China |
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Abstract To validate the feasibility of laser induced breakdown spectroscopy (LIBS) in detecting Cr in rice of polluted areas of Poyang Lake in Jiangxi province, rice husk samples，coarse rice samples and polished rice samples in the area were selected randomly as targets. In this work, these samples were tested with LIBS and the content of Cr was acquired by flame atomic absorption (AAS) in fresh samples. LIBS spectra showed that Cr Ⅰ 425.43 nm，Cr Ⅰ 427.48 nm，Cr Ⅰ 428.97 nm and abundant mineral elements such as Fe and Si were detected clearly , but they were undetectable directly in coarse rice and polished rice. The results of AAS shows that Cr in rice husk is more than the corresponding coarse rice and the Cr in polished rice does not exceed the limited content of 1 mg·kg-1 according to qualified national standards GB 2762—2012. The ratio between rice husk and coarse rice is about 78.95, it displayed the distribution is clear. This shows that compared with coarse rice, the concentration enrichment ratio of Cr in rice husk is higher than the coarse rice. The results demonstrate that it is feasible to detect Cr in rice husk and coarse rice. Therefore, it is helpful to predict the distribution of heavy metals in agricultural products by means of green method without pollution.
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Received: 2015-12-28
Accepted: 2016-05-10
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Corresponding Authors:
YAO Ming-yin
E-mail: mingyin800@126.com
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