利用原子吸收光谱法和电镜能谱仪法分析重金属Pb、Cd在水稻颖果不同部位中的分配

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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 words： atomic absorption spectroscopy environmental scanning electron microscopy Pb Cd rice caryopsis

Received: 25 August 2009

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	Articles by authors
	CHEN Juan
	SUN Jian-kun
	FANG Yuan-ping

Cite this article:

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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