Impact of CaO, fly ash, sulfur and Na2S on the (im)mobilization and phytoavailability of Cd, Cu and Pb in contaminated soil.
Impact of CaO, fly ash, sulfur and Na2S on the (im)mobilization and phytoavailability of Cd, Cu and Pb in contaminated soil.
复制标题
DOI：
10.1016/j.ecoenv.2016.08.025
复制
发表时间：
2016-12
影响因子：
6.8
通讯作者：
A. Mahar;Ping Wang;Amjad Ali;Zhanyu Guo;M. Awasthi;A. Lahori;Quan Wang;Feng Shen;Ronghua Li;Zengqiang Zhang
中科院分区：
文献类型：
--
作者：
A. Mahar;Ping Wang;Amjad Ali;Zhanyu Guo;M. Awasthi;A. Lahori;Quan Wang;Feng Shen;Ronghua Li;Zengqiang Zhang
土壤重金属污染是一个全球性的严重问题，因为它通过食物链对人类健康构成潜在风险。因此，需要一种可持续的解决方案来有效修复重金属污染的土壤。我们的研究旨在评估 CaO、粉煤灰、硫和 Na2S 对污染土壤中 Cd、Cu 和 Pb 的固定及其对大白菜 (Brassica rapachinensis) 吸收的影响。与对照相比，经处理的土壤中 DTPA 可提取的 Cd、Cu 和 Pb 浓度显着降低。而Cd、Cu、Pb在土壤系统中的溶解度有较大程度的增加，有利于大白菜根部和地上部对金属的吸收。一般来说，与对照相比，芽的镉吸收显着增加，其次是根。此外，与根部相比，茎部对铜的吸收也有同样的增加趋势。然而，与对照相比，Na2S 处理的样品中芽的 Pb 吸收量显着增加，而 CaO 处理的样品中的根部显示出巨大的 Pb 吸收潜力。虽然硫处理有效地固定了金属，但将土壤 pH 值降低至高酸性水平，这限制了硫处理样品中大白菜的生长。我们假设硫改良剂可以应用于碱性土壤而不是酸性土壤中的金属固定化，以获得更好的固定化效果。为了利用 CaO、FA 和 Na2S 实现 Cd、Cu 和 Pb 的可持续植物提取，建议在未来的研究中对非食用超积累物种进行研究。
Soil heavy metals pollution is a serious problem worldwide due to its potential human health risks through food chain. Therefore, a sustainable solution is needed to efficiently remediate HMs contaminated soils. Our study aimed to assess the impact of CaO, fly ash, sulfur, and Na2S on the immobilization of Cd, Cu, and Pb and their uptake by Chinese cabbage (Brassica rapachinensis)in a contaminated soil. The concentration of DTPA-extractable Cd, Cu, and Pb was significantly decreased as compared to control in treated soil. However, the solubility of Cd, Cu, and Pb has increased at greater extent in soil system which favored the uptake of metals in roots and shoots of Chinese cabbage. In general, Cd uptake was significantly increased in shoots followed by roots as compared to control. In addition, Cu has also same trend of increased uptake in shoots as compared to roots. However, the uptake Pb in shoots was considerably increased in Na2S treated samples whereas roots have shown great potential for Pb uptake in CaO treated samples as compared to control. Although, sulfur treatments had efficiently immobilized metals but reduced soil pH to highly acidic level which restricted the growth of Chinese cabbage in sulfur treated samples. We assume that sulfur amendment could be applied for immobilization of metals in alkaline soils rather than acidic soils to achieve better immobilization results. In order to achieve sustainable phytoextraction of Cd, Cu, and Pb using CaO, FA, and Na2S, the non-edible hyperaccumulators species are suggested to be investigated in future studies.