Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
Carbohydr Polym. 2020 Oct 15;246:116559. doi: 10.1016/j.carbpol.2020.116559. Epub 2020 Jun 9.
Water-soluble chitosan (WSC) was used to enhance cadmium (Cd) phytoextraction by Hylotelephium spectabile, a promising accumulator. The effect of WSC on Cd forms and functional groups in contaminated soils was determined to clarify the internal mechanism of WSC affecting phytoremediation. Results showed that WSC significantly increased the water-soluble and acid-extractable Cd in contaminated soils by 20.3 %-143.5 % and 2.4 %-39.5 %, respectively. Fourier transform infrared spectra analysis showed that amino and hydroxyl groups in soils were significantly increased in the presence of WSC. The coordination of Cd with increased amino and hydroxyl groups may play important roles in formation of Cd complexes and mobilizing Cd in soils. WSC significantly increased the Cd phytoextraction of H. spectabile by 56.1 %-115.7 % without obvious growth inhibition, which was further confirmed under field trial conditions. Therefore, it is feasible to apply WSC as a soil amendment to Cd-contaminated soils during remediation with H. spectabile.
水溶性壳聚糖 (WSC) 被用于增强具有良好富集能力的景天三七对镉 (Cd) 的植物提取。本研究测定了 WSC 对污染土壤中 Cd 形态和官能团的影响，以阐明 WSC 影响植物修复的内在机制。结果表明，WSC 分别显著增加了污染土壤中水溶性 Cd 和酸提取态 Cd 的含量，增幅为 20.3%-143.5%和 2.4%-39.5%。傅里叶变换红外光谱分析表明，WSC 的存在使土壤中的氨基和羟基显著增加。Cd 与增加的氨基和羟基的配位可能在 Cd 配合物的形成和土壤中 Cd 的迁移中发挥重要作用。WSC 显著增加了景天三七对 Cd 的植物提取，增幅为 56.1%-115.7%，而对植物生长没有明显的抑制作用，这一结果在田间试验条件下也得到了进一步证实。因此，在使用景天三七修复 Cd 污染土壤时，将 WSC 作为土壤改良剂是可行的。
