Effects of humic acid on speciation and bioavailability to wheat of rare earth elements in soil

Authors: Xueyuan, Gu; Xiaorong, Wang; Zhimang, Gu; Lemei, Dai; Yijun, Chen

Source: Chemical Speciation and Bioavailability, Volume 13, Number 3, August 2001 , pp. 83-88(6)

Publisher: Science Reviews 2000 Ltd

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Abstract:

Humic acid (HA) was extracted from an organic-rich soil in Heilongjian Province of China by 0.5 mol L⁻¹ NaOH. The effects of HA on the distribution of rare earth elements (REEs) in Red Soil, a major soil type in the south of China, were investigated. The speciation of REEs in soil was analyzed by a sequential extraction technique. The bioavailabity of REEs in the same soil was investigated by the use of wheat seedling. The results showed that organic fraction of REEs is highly related to the concentration of HA, whereas the exchangeable fraction and carbonate fraction decreased as more HA was added. This was possibly related to the cation exchange capacity (CEC), because HA and CEC had a significant linear relationship. The REEs in wheat pooled in the roots. Low concentration of HA (<0.2 g kg⁻¹) promoted the bioaccumulation of REEs in wheat root, while high concentration (>0.2 g kg⁻¹) decreased the REE concentrations. The REE concentration in roots was negatively correlated to the HA concentration.

Keywords: humic acids; rare earth elements; red soil; species; bioavailability

Document Type: Research article

DOI: http://dx.doi.org/10.3184/095422901782775426

Affiliations: 1: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science, Nanjing University, Nanjing 210093, P.R. China

Publication date: 2001-08-10

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Chemical Speciation & Bioavailability covers a rapidly expanding area in environmental science.
Research on the interactions between the chemical forms and behaviour of toxic compounds and their subsequent biological uptake, metabolism and ecological fate involves many scientific fields. These studies are often published in discipline-specific journals, leading to inadequate review and information scatter. This situation hinders both the development of an international community of experienced colleagues and the open flow of information and discussion. Additionally, the importance of speciation and bioavailability research to the development of pollution law and control technologies is being increasingly appreciated by environmental regulatory agencies throughout the world.
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Effects of humic acid on speciation and bioavailability to wheat of rare earth elements in soil

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