Coconut-fiber biochar reduced the bioavailability of lead but increased its translocation rate in rice plants: Elucidation of immobilization mechanisms and significance of iron plaque barrier on roots using spectroscopic techniques

JOURNAL OF HAZARDOUS MATERIALS

卷:389

Article

Li, Jianhong^1,2  Wang, Shan-Li³  Zhang, Jingmin²  Zheng, Lirong⁴  Chen, Dongliang⁴  Wu, Zhipeng²  Shaheen, Sabry M.^5,6,7  Rinklebe, Joerg^5,8  Ok, Yong Sik^9,10  Wang, Hailong^11,12  Wu, Weidong² 

[1] Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China

[2] Hainan Univ, Coll Trop Crops, Haikou 570228, Hainan, Peoples R China

[3] Natl Taiwan Univ, Dept Agr Chem, Taipei 10617, Taiwan

[4] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China

[5] Univ Wuppertal, Inst Fdn Engn Water & Waste Management, Sch Architecture & Civil Engn, Lab Soil & Groundwater Management, Pauluskirchstr 7, D-42285 Wuppertal, Germany

[6] King Abdulaziz Univ, Fac Meteorol Environm & Arid Land Agr, Dept Arid Land Agr, Jeddah 21589, Saudi Arabia

[7] Univ Kafrelsheikh, Fac Agr, Dept Soil & Water Sci, Kafr Al Sheikh 33516, Egypt

[8] Sejong Univ, Dept Environm Energy & Geoinformat, Seoul 05006, South Korea

[9] Korea Univ, Korea Biochar Res Ctr, Seoul 02841, South Korea

[10] Korea Univ, Div Environm Sci & Ecol Engn, Seoul 02841, South Korea

[11] Zhejiang A&F Univ, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Zhejiang, Peoples R China

[12] Foshan Univ, Biochar Engn Technol Res Ctr Guangdong Prov, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China

关键词: Lead accumulation;    Biochar amendment;    Contaminated paddy soil;    XAFS;    XRF;   

DOI  :  10.1016/j.jhazmat.2020.122117

来源: Elsevier

【 摘 要 】

Coconut-fiber biochar (CFB) was applied at 3% (w/w) to two soils spiked with 250, 2500, 5000 mg kg(-1) of lead (Pb), respectively, aiming to explore the effects of CFB and the significance of iron (Fe) plaque on rice roots on the accumulation and translocation of Pb in rice plants using micro-X-ray fluorescence and X-ray absorption spectroscopies. The CFB amendment resulted in a significant decrease in the EDTA-extractable Pb availability in the soils, which might be attributed to the increased amounts of Pb-loaded humic acid and Pb-3(PO4)(2) formed in the soils. Consequently, the addition of CFB caused a significant decrease in Pb concentrations of the brown rice harvested from the CFB-amended soils under all Pb levels by 14 %-47 %, as compared to those from the unamended soils. Therefore, CFB could be used as an immobilizing agent for Pb in contaminated soils. However, CFB application significantly inhibited the formation of Fe/Mn plaques on rice roots and reduced its interception effect on Pb uptake, which consequently increased the Pb translocation rate from root to shoot. Therefore, the increased translocation rate of Pb in rice plants by CFB should not be ignored when CFB is applied to remediate Pb-contaminated paddy soils.

【 授权许可】

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