稻壳生物炭对污染土壤中稀土元素生物有效性的影响

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Abstract

This study was conducted to investigate the effect of Rice hull ash (RHA) and rice hull biochar (RHB) on the bioavailability of rare earth elements (REEs) in the acidic soil. RHA and RHB were mixed into the artificially polluted soil at 0 (W/W), 5% (W/W, and 10% (W/W), respectively. pot experiments were conducted to assess the bioaccumulation of rare earth elements (REEs) by Carrot and chrysanthemum, which sequential extraction was used to analyze the change of REEs' fraction in the soil. The results of pot experiment indicated that the acid extractable of REEs decreased 31.56%, and 19.915% in the soil with 10% RHA and 10% RHB, comparing with the control group. Furthermore, the uptake of REEs by Carrot and chrysanthemum reduced 98.08% and 93.41% in the soil amended by 10% RHA, and decreased 68.61% and 66.75% with 10% RHB. In short, the addition of RHA and RHB can significantly decrease the bioavailability of REEs and restrain the plant's enrichment. Moreover, the amendment effect of RHA was better than the RHB, so the ash of crop straw, as a kind of convenient and effective soil conditioner, need to be valued application on the contaminated soil.

Key words： rice husk biochar rice husk ash rare earth element bioavailability soil remediation

Received: 03 June 2018

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	Articles by authors
	LI Meng-ke
	ZHOU Dan
	GAO Zhen
	JANG Xing-xing
	LUO Xian-ping

Cite this article:

LI Meng-ke,ZHOU Dan,GAO Zhen等. Effect of rice husk biochar on bioavailability of rare earth elements in polluted soil[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(10): 3823-3832.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I10/3823

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