Changes in the heavy metal solubility of two contaminated soils after heavy metals phytoextraction with Noccaea caerulescens
Changes in the heavy metal solubility of two contaminated soils after heavy metals phytoextraction with Noccaea caerulescens
复制标题
DOI：
10.1016/j.ecoleng.2015.11.055
复制
发表时间：
2016-04
影响因子：
3.8
通讯作者：
I. Martínez-Alcalá;M. Bernal;C. D. L. Fuente;D. Gondar;R. Clemente
中科院分区：
文献类型：
--
作者：
I. Martínez-Alcalá;M. Bernal;C. D. L. Fuente;D. Gondar;R. Clemente
超积累植物物种，如Nabeea caerulescens，已被深入研究，由于它们在植物提取技术中的使用，虽然在修复过程结束时留在根部的金属的命运仍然不确定。在这里，发芽和生长，植物组织中的金属积累和收获后残留在土壤中的根的降解进行了研究，在两个受污染的土壤从一个有毒的黄铁矿污泥泄漏的影响。特别设计的盆允许分离的散装土壤和根际，在土壤中的重金属分馏确定在生长期结束时。在植物的地上部分中发现了高浓度的Cd，特别是Zn，尽管Cd的生物富集因子（BCF）（13-34）高于Zn（2.37-4.34）。对于这两种土壤，可溶性和交换性（CaCl 2提取）的Fe和Mn的浓度较高，在根际比在散装土壤，而Zn和Cd的浓度较大的散装土壤。研究了植物收获后，富集重金属的根系在土壤中的降解过程及其对土壤金属溶解性的影响。有根系的土壤中Cu、Mn的可溶性含量高于无根系的土壤。然而，根系降解后（8-14%的有机碳被分解）释放到土壤中的重金属量相当低（低于0.1 μg g-1），表明使用N的可行性。用于植物提取。
Hyperacumulator plant species, such asNoccaea caerulescens, have been deeply studied due to their use in phytoextraction techniques, although the fate of the metals remaining in the roots at the end of the remediation process is still uncertain. Here, germination and growth, metal accumulation in plant tissues and degradation of roots remaining in the soil after harvest have been studied in two contaminated soils from an area affected by a toxic pyritic sludge spillage. Specially designed pots allowed the separation of the bulk soil and rhizosphere, where heavy metals fractionation in soil was determined at the end of the growing period. High Cd and, especially, Zn concentrations in the aerial parts of the plants were found, although the bio-concentration factors (BCF) were higher for Cd (13–34) than for Zn (2.37–4.34). For both soils, the soluble and exchangeable (CaCl2-extractable) concentrations of Fe and Mn were higher in the rhizosphere than in the bulk soil, while Zn and Cd concentrations were greater in the bulk soil. After plant harvesting, the degradation of heavy metal enriched roots in the soil was studied as well as the effect of this process on soil metal solubility. The soluble concentrations of Cu and Mn were higher in the soils with roots that in the corresponding soils without roots. Nevertheless, the amount of heavy metals released to the soil after root degradation (8–14% of their organic C was decomposed) was rather low (below 0.1 μg g−1), showing the feasibility of the use ofN. caerulescensfor phytoextraction.