浙西水田土壤镉形态与有效性研究

doi:10.11720/wtyht.2020.1562

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Abstract

The bioavailability of cadmium (Cd) in soil is affected by many factors, while the morphological distribution characteristic is one of the important factors. In order to find out the bioavailability of Cd in paddy soil in western Zhejiang Province and analyze the relationship between the forms of Cd in soil and Cd content in rice grains, the authors collected and analyzed 32 samples of paddy soil and 15 samples of paddy rice. First, the morphological distribution characteristics and biological characteristics of Cd in soil under different pH and parent materials conditions were discussed. And then, by linear correlation analysis, the correlation between the Cd content in rice and different forms of Cd in soil was studied.The results show that Cd in paddy soil is mainly in the form of ion exchange (about 35% of the total amount), and the content of water soluble Cd is the least (about 1% of the total amount), with other forms of Cd in between. Under acidic condition (pH 5.0~6.5), both of the ion-exchange Cd and the bioavailability of Cd are the highest.The morphological distribution characteristics of Cd in soil between the weathered limestone and the other parent materials are quite different.Varying measures should be taken to control the Cd pollution in different parent material areas. The correlation analysis shows that there is a significant correlation between the Cd content of rice and the ion-exchange Cd content (P<0.01), but the correlation with other forms of Cd is not obvious.

Key words： cadmium speciation analysis paddy soil bioavailability

Received: 29 November 2019 Published: 26 October 2020

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	Dao-Rong LIU
	Yi ZHOU

Cite this article:

Dao-Rong LIU,Yi ZHOU. Speciation characteristics and bioavailability of cadmium in paddy soils, western Zhejiang Province[J]. Geophysical and Geochemical Exploration, 2020, 44(5): 1239-1244.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1562 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I5/1239

The total and fraction Cd content and pH in soil as well as Cd content in rice grains

The percentage of fraction Cd with its total content in paddy soil

The ratio of Cd with different forms in soil under different pH

The ratio of Cd with different forms in soil under different parent materials

Correlation between different forms of Cd in soil and Cd content in rice

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