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A review of amendments for simultaneously reducing Cd and As availability in paddy soils and rice grain based on meta-analysis

文献类型： 外文期刊

作者： Mabagala, Frank Stephano 1 ; Zhang, Ting 1 ; Zeng, Xibai 1 ; He, Chao 1 ; Shan, Hong 1 ; Qiu, Cheng 4 ; Gao, Xue 4 ; Zhang, Nan 1 ; Su, Shiming 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Key Lab Agroenvironm, Minist Agr, Beijing 100081, Peoples R China

2.TARI Mlingano Ctr, Tanzania Agr Res Inst TARI, POB 5088, Tanga, Tanzania

3.Univ Liege, Gembloux Agrobio Tech, B-5030 Gembloux, Belgium

4.Xizang Acad Agr & Anim Husb Sci, Inst Agr Resources & Environm, Lhasa 850000, Peoples R China

关键词： Paddy soil; Arsenic; Cadmium; Immobilization; Bioavailability

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.0； 五年影响因子：7.9 ）

ISSN： 0301-4797

年卷期： 2024 年 366 卷

页码：

收录情况： SCI

摘要： Arsenic (As) and cadmium (Cd) accumulation in rice grains is a global food safety issue, and various methods and materials have been used to remove or reduce As and Cd in agricultural soils and rice grains. Despite the availability of synthesized materials capable of simultaneous As and Cd reduction from soil and rice grains, the contributions, efficiency, and main ingredients of the materials for As and Cd immobilization remain unclear. The present study first summarized the biogeochemistry of As and Cd in paddy soils and their transfer in the soil-food-human continuum. We also reviewed a series of reported inorganic and organic materials for simultaneous immobilization of As and Cd in paddy soils, and their reduction efficiency of As and Cd bioavailability were listed and compared. Based on the abovementioned materials, the study conducted a meta-analysis of 38 articles with 2565 observations to quantify the impacts of materials on simultaneous As and Cd reduction from soil and rice grains. Meta-analysis results showed that combining organic and inorganic amendments corresponded to effect sizes of -62.3% and -67.8% on As and Cd accumulation in rice grains, while the effect sizes on As and Cd reduction in paddy soils were -44.2% and -46.2%, respectively. Application of Fe based materials significantly (P < 0.05) reduced As (-54.2%) and Cd (-74.9%), accounting for the highest immobilization efficiency of As and Cd in rice grain among all the reviewed materials, outweighing S, Mn, P, Si, and Ca based materials. Moreover, precipitation, surface complexation, ion exchange, and electrostatic attraction mechanisms were involved in the co-immobilization tactics. The present study underlines the application of combined organic and inorganic amendments in simultaneous As and Cd immobilization. It also highlighted that employing Fe-incorporated biochar material may be a potential strategy for co-mitigating As and Cd pollution in paddy soils and accumulation in rice grains.

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