Meta-Analysis of Biochar as an Amendment for Arsenic Mitigation in Paddy Soils

IF 6.4 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Current Pollution Reports Pub Date : 2024-01-06 DOI:10.1007/s40726-023-00288-1

Jajati Mandal, Pushpa Kumari Sharma, Debapriya Mondal, Michael D. Wood, Simon M. Hutchinson, Jason Kirby, Prashant Srivastava

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Abstract

Purpose of Review

The purpose of this review is to evaluate the effectiveness of biochar in immobilizing arsenic (As) in contaminated paddy soils and its impact on As availability and bioaccumulation in rice, as well as rice plant biomass.

Recent Findings

Recent studies have focused on managing As contamination in agricultural fields, with a particular focus on South and Southeast Asia, where rice, a primary food source and As accumulator, is of significant concern. Biochar, a product of biomass pyrolysis, has emerged as a viable solution for environmental remediation due to its effectiveness in immobilizing metal(loid)s in water and soil. The successful implementation of biochar as a soil amendment strategy has led to growing interest in its use as an effective means of reducing the bioaccumulation and availability of metal(loid)s, including As.

Summary

A meta-analysis of 25 studies revealed that biochar generated from maize and sewage sludge successfully reduced As availability and bioaccumulation in rice grains. In addition, the use of biochar led to higher biomass and yield of rice crops compared to control groups. Modified biochar was more effective in decreasing As availability, likely due to interactions with iron and calcium phases or complexes occurring in or on the biochars. Nevertheless, at elevated biochar dosages, As mobilization was noted in field conditions which warrants further investigation.

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生物炭作为水稻土中砷缓解剂的 Meta 分析

本综述旨在评估生物炭固定受污染稻田土壤中砷（As）的有效性及其对水稻中砷的可用性和生物累积性以及水稻植物生物量的影响。最近的研究结果最近的研究重点是治理农田中的砷污染，尤其关注南亚和东南亚地区，在这些地区，作为主要食物来源和砷累积者的水稻备受关注。生物炭是生物质热解的产物，由于能有效固定水和土壤中的金属（loid），因此已成为一种可行的环境修复解决方案。对 25 项研究进行的荟萃分析表明，玉米和污水污泥产生的生物炭成功地降低了砷在稻谷中的可得性和生物累积性。此外，与对照组相比，使用生物炭可提高水稻作物的生物量和产量。改性生物炭在降低砷的可得性方面更为有效，这可能是由于生物炭中或生物炭上的铁相和钙相或复合物之间的相互作用。然而，在田间条件下，当生物炭的用量增加时，砷的迁移率也有所提高，这值得进一步研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Current Pollution Reports Environmental Science-Water Science and Technology

CiteScore

12.10

自引率

1.40%

发文量

期刊介绍： Current Pollution Reports provides in-depth review articles contributed by international experts on the most significant developments in the field of environmental pollution.By presenting clear, insightful, balanced reviews that emphasize recently published papers of major importance, the journal elucidates current and emerging approaches to identification, characterization, treatment, management of pollutants and much more.