Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Agricultural College, Liaocheng University, Liaocheng 252000, China.
Sci Total Environ. 2021 Jun 10;772:145554. doi: 10.1016/j.scitotenv.2021.145554. Epub 2021 Feb 2.
To understand the effect mechanisms of iron plaque and fatty acids on the migration of PBDEs from soil to rice (Oryza sativa), pot experiments were conducted in the soil spiked with decabromodiphenyl ether (BDE-209) under the conditions of tourmaline and nano-goethite Fenton-like treatments. The results showed that iron mineral Fenton-like oxidation could effectively remove BDE-209 from rhizosphere soil, the highest removal rate obtained 89.29% with the addition of 0.4 mmol/L HO and 8 g nano-goethite (G + 3H group). Iron mineral Fenton-like oxidation could produce iron plaque (IP) on rice roots and accumulate a part of contaminants on the surface of IP, further weakening BDE-209 uptake in the plants. Additionally, the occurrence of fatty acid variation induced by BDE-209 stress, iron mineral Fenton-like oxidation at high concentrations of HO with 0.4 mmol/L affected the distribution of fatty acids in plant tissues, especially for C fatty acid. While the IP on rice roots prevented the BDE-209 into plant, it was also closely related to the distribution of fatty acids in rice, altering BDE-209 accumulation in the rice. To safely use the iron mineral Fenton-like oxidation in the agricultural soil remediation, the safety of plant cells treated by mineral Fenton-like oxidation was evaluated using the transmission electron microscopy (TEM) and enzyme activity determination, which indicated that iron mineral Fenton-like oxidation would destroy the inner structures of plant cells, especially for G + 3H group.
为了了解铁斑和脂肪酸对多溴二苯醚（PBDEs）从土壤向水稻（Oryza sativa）迁移的影响机制，在添加十溴联苯醚（BDE-209）的土壤中进行了电气石和纳米针铁矿芬顿类处理的盆栽实验。结果表明，铁矿物芬顿类氧化可以有效地从根际土壤中去除 BDE-209，在添加 0.4 mmol/L HO 和 8 g 纳米针铁矿（G+3H 组）时，最高去除率达到 89.29%。铁矿物芬顿类氧化可以在水稻根上产生铁斑（IP），并在 IP 表面积累一部分污染物，从而进一步削弱植物对 BDE-209 的吸收。此外，BDE-209 胁迫引起的脂肪酸变化、高浓度 HO（0.4 mmol/L）的铁矿物芬顿类氧化会影响植物组织中脂肪酸的分布，特别是 C 脂肪酸。虽然水稻根上的 IP 阻止了 BDE-209 进入植物，但它与水稻中脂肪酸的分布也密切相关，改变了 BDE-209 在水稻中的积累。为了在农业土壤修复中安全使用铁矿物芬顿类氧化，通过透射电子显微镜（TEM）和酶活性测定评估了矿物芬顿类氧化处理的植物细胞的安全性，结果表明，铁矿物芬顿类氧化会破坏植物细胞的内部结构，特别是 G+3H 组。
