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Analysis on the distribution of heavy metal Pb and Cd in rice grain by atomic absorption spectroscopy and environmental scanning electron microscopy
CHEN Juan, SUN Jian-kun, FANG Yuan-ping
College of Life Science and Engineering, Huanggang Normal University, Hubei, Huanggang 438000, China
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Abstract  

Traditional atomic absorption spectroscopy method and the environmental scanning electron microscopy method are compared in analyzing the distribution of heavy metal Pb and Cd in rice grain.Two methods show that the concentrations of Pb and Cd in different parts of rice caryopsis are in the order of embryo>aleuron layer>pericarp>external endosperm>center of caryopses.Smaller difference in the content of Pb and Cd is found in embryo,aleurone layer and pericarp;besides,little difference exists in the whole endosperm,but the contents of Pb and Cd in embryo,aleurone layer and pericarp are significantly higher than in the endosperm.Environmental scanning electron microscopy can accurately reflect the difference of distribution of heavy metals in different parts of plant,and there is no obvious difference as compared to atomic absorption spectroscopy. Environmental scanning electron microscopy method is easy and quick;however,it can only detect qualitatively but can not detect accurately the content of elements in a specific part,so it can not take the place of the traditional method.

Key wordsatomic absorption spectroscopy      environmental scanning electron microscopy      Pb      Cd      rice caryopsis     
Received: 25 August 2009     
:  Q95  
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CHEN Juan
SUN Jian-kun
FANG Yuan-ping
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CHEN Juan,SUN Jian-kun,FANG Yuan-ping. Analysis on the distribution of heavy metal Pb and Cd in rice grain by atomic absorption spectroscopy and environmental scanning electron microscopy[J]. , 2009, 28(4): 348-351.
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http://www.ecolsci.com/EN/     OR     http://www.ecolsci.com/EN/Y2009/V28/I4/348
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