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Crucial role of iron plaque on thallium uptake by rice plant

Waste Disposal and Sustainable Energy 2023年第1期5卷 89-96页

作者： Xiaoyin Zhang Wenhuan Yuan Juan Liu Haoran Li Han Cai Haiyao Hu Dongyi Ren Yuhua Zhang Yuxiang Shen Jin Wang School of Environmental Science and Engineering and Key Laboratory of Waters Quality&Conservation in the Pearl River Delta Ministry of EducationGuangzhou UniversityGuangzhou510006China Guangdong Provincial Key Laboratory of Radionuclides pollution Control and Resources Guangzhou510006China

Iron plaque is a Fe-containing oxide film produced by the oxidation of Fe(II)in the rice root system under the combined action of oxygen infiltration and other *** to its special surface structure and physio-chemical properties,the iron plaque has a strong absorption capacity for a variety of heavy metal *** study aimed to first investigate the effects of Fe species on the geochemical fractionation of Tl in typical paddy soil systems affected by industrial activities,followed by pot culture experiments to probe the effects of Fe species on the uptake and translocation of Tl in rice *** results of field work preliminarily showed that iron at different valences affected the conversion of the Tl geochemical fraction in the *** Tl exerted significant positive correlation relationships with Fe2+and negative correlation relationships with Fe3+,while reducible Tl only displayed a positive correlation with Fe3+.Further analysis by pot culture experiments revealed that the contents of Fe were significantly positively correlated with Tl contents in Fe plaque(R2=0.529).In contrast,the water-soluble Tl contents in the soil were significantly negatively correlated with the contents of Fe(R2=–0.90,p<0.05).It suggests that the iron plaque promoted the absorption and fixation of Tl on the root surface of rice plants,causing Tl to accumulate in the iron ***,the Tl content in the Fe plaque on the root surface of rice plants was greater than that in the above-ground tissues,which indicates that most Fe plaque exerts a certain degree of inhibition on Tl migration into the above-ground tissues of rice *** these findings indicate that Fe film is also an important carrier of Tl transfer in the soil–rice plant system,which provides new scientific support for the remediation of typical Tl-contaminated rice fields.

关键词： Iron oxide thallium pollution Iron plaque Rice

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