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The effect of sepiolite application on rice Cd uptake - A two-year field study in Southern China

文献类型： 外文期刊

作者： Chen, De 1 ; Ye, Xuezhu 1 ; Zhang, Qi 1 ; Xiao, Wendan 1 ; Ni, Zhongying 2 ; Yang, Li 3 ; Zhao, Shouping 1 ; Hu, Jing 1 ; Ga 1 ;

作者机构： 1.Minist Agr & Rural Affairs China, Key Lab Informat Traceabil Agr Prod, State Key Lab Qual & Safety Agroprod Prepared, Zhejiang Acad Agr Sci,Inst Qual & Stand Agroprod, Hangzhou 310021, Zhejiang, Peoples R China

2.Extens Ctr Agr & Forestry Technol Tonglu Cty, Tonglu 311500, Zhejiang, Peoples R China

3.China Natl Inst Standardizat, Beijing 100191, Peoples R China

关键词： Bioavailability; Heavy metal; Remediation; Sepiolite; Soil

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：6.789； 五年影响因子：6.914 ）

ISSN： 0301-4797

年卷期： 2020 年 254 卷

页码：

收录情况： SCI

摘要： Sepiolite (SEP) is a clay mineral with great potential to stabilize soil heavy metals. A two-year field experiment was conducted to explore the optimum use of SEP to immobilize soil Cd and to promote the consumption safety of rice grown in a typical paddy field in Southern China. SEP was applied once or twice over the two-year study at three levels (0.1, 0.5, and 1%, w/w) before rice planting. The results showed that SEP effectively reduced rice grain Cd concentrations by 47-49% in the first year and by 44-50% in the second year due to the residue effect. Application of SEP for two consecutive years reduced the rice grain Cd concentration by up to 75%, achieving a safe level (<0.2 mg kg(-1)). SEP also reduced Zn concentrations in rice grains (by 6-10%), while the Cd/Zn ratios of rice grains were decreased by 24-72% over the two years, implying it was much safer for consumption. SEP significantly increased the soil pH (0.9-1.8 units) and available phosphorus, and it reduced the soil available Cd (by 20-95%) and Zn concentrations (by 30-99%). In brief, SEP effectively stabilized soil Cd and reduced uptake by rice; the effect was dose-dependent and 0.5% (w/w) was optimum in the present study. The main mechanism of SEP to stabilize soil Cd is the increase in soil pH analogous to liming. This study shows that SEP application can be an efficient way to remediate Cd contaminated rice paddies and fulfill the goal of safe production of rice and thereby reduce the health risks associated with consuming rice.

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