Lin Longyong, Zhong Lirong, Yan Xiulan, Fei Yang
J Environ Qual. 2018 Mar;47(2):312-317. doi: 10.2134/jeq2017.07.0297.
(Burk.) F.H. Chen, a valuable Chinese medicine, is currently confronted with arsenic (As) contamination in China due to soil pollution. Our previous research demonstrated that Fe(0) and zeolite had a certain inhibitory effect on As accumulation in . In order to further reduce As accumulation in the plant, a synthetic iron material (Fe-Ce oxide [FC]) with high As adsorption capacity was tested for As remediation. In the study, after FC was applied to the As-contaminated soil, was planted in the soil. The As leaching behavior of the treated soil and As accumulation in were evaluated. The results showed that FC immobilized As more effectively than Fe(0) and zeolite in soils with high As concentrations. When the FC dosage was 0.5 % (w/w), As concentration of root (the main medicinal part) decreased by 56%, and root biomass increased by 55%. Results indicated FC could reduce the non-specifically adsorbed As fraction (F1) and specifically adsorbed As fraction (F2) by 22 to 31% and 5 to 17%, respectively, thus reducing the toxicity characteristic leaching procedure leachable As concentration by 41 to 67%. The finding of an iron plaque coating on the plant root and its function as a barrier to As uptake by is reported here for the first time. The occurrence of iron plaque led to a reduction in As concentration in the phellem and xylem-phloem by 66 to 80% and 43 to 70%, respectively. Our findings will help in developing As contamination control in areas where is planted and set a foundation for a FC-based As immobilization technology.
（伯克.）陈焕镛，一种珍贵的中药材，由于土壤污染，目前在中国面临砷（As）污染问题。我们之前的研究表明，零价铁（Fe(0)）和沸石对[植物名称未明确]中砷的积累有一定的抑制作用。为了进一步减少植物中的砷积累，测试了一种具有高砷吸附能力的合成铁材料（铁铈氧化物[FC]）用于砷修复。在该研究中，将FC施用于受砷污染的土壤后，在土壤中种植[植物名称未明确]。评估了处理后土壤中砷的淋溶行为以及[植物名称未明确]中砷的积累情况。结果表明，在高砷浓度土壤中，FC比Fe(0)和沸石更有效地固定了砷。当FC用量为0.5%（w/w）时，根（主要药用部位）中的砷浓度降低了56%，根生物量增加了55%。结果表明，FC可分别将非特异性吸附砷组分（F1）和特异性吸附砷组分（F2）降低22%至31%和5%至17%，从而使毒性特征浸出程序可浸出砷浓度降低41%至67%。本文首次报道了在植物根上发现铁膜涂层及其作为[植物名称未明确]吸收砷的屏障的功能。铁膜的出现分别导致栓质和木质部 - 韧皮部中砷浓度降低66%至80%和43%至70%。我们的研究结果将有助于在种植[植物名称未明确]的地区开发砷污染控制方法，并为基于FC的砷固定技术奠定基础。
