S-nZVI和有机改进剂联合施用对水稻镉和砷积累的影响：可能的机制和对土壤健康的潜在影响

IF 6.7 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation Pub Date : 2024-11-30 DOI:10.1016/j.eti.2024.103942

Shuo Sun , Jiaqing Huang , Jiong Wen , Zhi Peng , Nan Zhang , Yanan Wang , Yang Zhang , Shiming Su , Xibai Zeng

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引用次数: 0

摘要

利用铁基材料原位修复镉（Cd）和砷（Cd&As）污染的土壤已经得到了广泛的研究。与铁基材料一样，在保持土壤健康的同时固定化镉是一项重大挑战。本研究考察了海泡石负载的纳米零价铁（S-nZVI）与有机改进剂(RS：稻草；猪粪对水稻吸收Cd&；As和土壤质量的影响。粮食Cd (0.134 mg  公斤−1)和无机(iAs) (0.099 mg  公斤−1)水平S-nZVI +点治疗减少了78.95 % 68.69 %比CK (P & lt; 0.05),和减少了52.62 % 17.50 %相比S-nZVI治疗(P & lt; 0.05)明显低于中国食品安全标准(0.20 & lt;  毫克公斤−1)。土壤pH升高、无定形铁（Feox）增加和PM络合作用共同促进了S-nZVI+PM处理中Cd的固定化；同时，较高的Feox维持了较低的水稻土有效砷水平。此外，S-nZVI+PM提高了土壤肥力、功能酶活性、土壤细菌群落多样性，提高了糙米产量。S-nZVI+RS促进了水稻土中Fe（氧）（氢）氧化物的还原性溶解和As的甲基化，使籽粒中总As和有机As含量较S-nZVI处理分别显著提高113.13 %和236.79 %。在砷污染水稻土中应用S-nZVI+RS应谨慎。结果表明，与S-nZVI+RS相比，S-nZVI+PM对Cd&；As的固定化效果更好，对土壤质量的效益也更大。总体而言，S-nZVI+PM代表了一种生态友好的方法，可以减轻稻米中Cd&；As的积累，同时改善土壤健康。

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Effects of combined applications of S-nZVI and organic amendments on cadmium and arsenic accumulation in rice: Possible mechanisms and potential impacts on soil health

In situ remediation of cadmium (Cd) and arsenic (As) (Cd&As) contaminated soil using iron-based materials has been extensively investigated. Simultaneous immobilizing Cd&As with iron-based materials while maintaining soil health poses a significant challenge. This study examined the effects of sepiolite-supported nanoscale zero-valent iron (S-nZVI) combined with organic amendments (RS: Rice straw; PM: Pig manure) on Cd&As uptake by rice and soil quality. Grain Cd (0.134 mg kg⁻¹) and inorganic As (iAs) (0.099 mg kg⁻¹) levels in S-nZVI+PM treatment were reduced by 78.95 % and 68.69 % compared to CK (P < 0.05), and decreased by 52.62 % and 17.50 % compared to S-nZVI treatment (P < 0.05), significantly lower than the Chinese Food Safety Standard (<0.20 mg kg⁻¹). The elevated soil pH, increased amorphous iron (Feox), and PM complexation co-contributed to Cd immobilization in S-nZVI+PM treatment; concurrently, the higher Feox maintained lower available As levels in paddy soil. In addition, S-nZVI+PM improved soil fertility, functional enzyme activity, soil bacterial community diversity, and increased brown rice yield. However, S-nZVI+RS facilitated the reductive dissolution of Fe(oxy)(hydro) oxides and As methylation in paddy soil, significantly increasing the total As and organic As content in grains by 113.13 % and 236.79 %, respectively, compared to S-nZVI treatment. Caution should be exercised in the application of S-nZVI+RS in As-contaminated paddy soil. S-nZVI+PM proved more effective in immobilizing Cd&As and provided greater benefits to soil quality compared to S-nZVI+RS. Overall, S-nZVI+PM represents an eco-friendly approach for alleviating Cd&As accumulation in rice grains while concurrently improving soil health.

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来源期刊

Environmental Technology & Innovation Environmental Science-General Environmental Science

CiteScore

14.00

自引率

4.20%

发文量

435

审稿时长

74 days

期刊介绍： Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas. As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.