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Effect of biochar from peanut shell on speciation and availability of lead and zinc in an acidic paddy soil.
Ecotoxicol Environ Saf. 2018 Nov 30; 164:554-561.EE

Abstract

Biochar has been used to reduce the mobility and availability of heavy metals in contaminated paddy soils. A pot experiment was carried out to analyze the effects of peanut shell biochar (PBC) on the speciation and phytoavailability of Pb and Zn in contaminated acidic paddy soil using rice (Oryza sativa L.) as an indicator plant. Peanut shell biochar was applied to an acidic paddy soil contaminated with Pb and Zn at four rates (0%, 1%, 2%, and 5% w/w), and rice plants were grown in this soil. The soil pH, cation exchange capacity (CEC), water-soluble SO4[2-], dissolved organic carbon (DOC), CaCl2-extractable heavy metals, and speciation of heavy metals were determined. Additionally, biomass and concentrations of heavy metals in rice tissues were determined. The application of PBC significantly increased the pH, CEC, water-soluble SO4[2-], and DOC in the paddy soil, but decreased the content of CaCl2-extractable Pb and Zn. The CaCl2-extractable Pb and Zn showed significant negative correlations with the pH, CEC, water-soluble SO4[2-], and DOC (p < 0.05). Following the application of biochar to the contaminated paddy soil, the Pb and Zn concentrations in the CaCl2 extracts were reduced by 41.04-98.66% and 17.78-96.87% (p < 0.05), respectively. Sequential chemical extractions showed a reduction in the acid-soluble Pb and Zn fraction and an increase in the reducible fraction following the addition of biochars. PBC obviously inhibited the uptake and accumulation of Pb and Zn in the rice plants. The Pb concentrations in the rice grain were significantly reduced by 60.32%, with the addition of 5% PBC. Neither of the biochars significantly changed the Zn concentrations in the rice grain. The influence of biochar on Pb and Zn phytoavailability varied not only with the application rate of biochar, but also with the kind of metals. Overall, the use of peanut shell biochar at a high application rate is more effective in immobilizing Pb and Zn in the acidic paddy soil contaminated with heavy metals, especially in reducing the phytoavailability of Pb to the rice plants.

Authors+Show Affiliations

Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China. Electronic address: xuchao1388@126.com.Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 10085, China.Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China. Electronic address: zhangyangzhu2006@163.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30149354

Citation

Chao, Xu, et al. "Effect of Biochar From Peanut Shell On Speciation and Availability of Lead and Zinc in an Acidic Paddy Soil." Ecotoxicology and Environmental Safety, vol. 164, 2018, pp. 554-561.
Chao X, Qian X, Han-Hua Z, et al. Effect of biochar from peanut shell on speciation and availability of lead and zinc in an acidic paddy soil. Ecotoxicol Environ Saf. 2018;164:554-561.
Chao, X., Qian, X., Han-Hua, Z., Shuai, W., Qi-Hong, Z., Dao-You, H., & Yang-Zhu, Z. (2018). Effect of biochar from peanut shell on speciation and availability of lead and zinc in an acidic paddy soil. Ecotoxicology and Environmental Safety, 164, 554-561. https://doi.org/10.1016/j.ecoenv.2018.08.057
Chao X, et al. Effect of Biochar From Peanut Shell On Speciation and Availability of Lead and Zinc in an Acidic Paddy Soil. Ecotoxicol Environ Saf. 2018 Nov 30;164:554-561. PubMed PMID: 30149354.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of biochar from peanut shell on speciation and availability of lead and zinc in an acidic paddy soil. AU - Chao,Xu, AU - Qian,Xiang, AU - Han-Hua,Zhu, AU - Shuai,Wang, AU - Qi-Hong,Zhu, AU - Dao-You,Huang, AU - Yang-Zhu,Zhang, Y1 - 2018/08/24/ PY - 2018/04/13/received PY - 2018/08/12/revised PY - 2018/08/16/accepted PY - 2018/8/28/pubmed PY - 2018/11/28/medline PY - 2018/8/28/entrez KW - Biochar KW - Contaminated paddy soil KW - Heavy metals KW - Phytoavailability KW - Rice SP - 554 EP - 561 JF - Ecotoxicology and environmental safety JO - Ecotoxicol Environ Saf VL - 164 N2 - Biochar has been used to reduce the mobility and availability of heavy metals in contaminated paddy soils. A pot experiment was carried out to analyze the effects of peanut shell biochar (PBC) on the speciation and phytoavailability of Pb and Zn in contaminated acidic paddy soil using rice (Oryza sativa L.) as an indicator plant. Peanut shell biochar was applied to an acidic paddy soil contaminated with Pb and Zn at four rates (0%, 1%, 2%, and 5% w/w), and rice plants were grown in this soil. The soil pH, cation exchange capacity (CEC), water-soluble SO4[2-], dissolved organic carbon (DOC), CaCl2-extractable heavy metals, and speciation of heavy metals were determined. Additionally, biomass and concentrations of heavy metals in rice tissues were determined. The application of PBC significantly increased the pH, CEC, water-soluble SO4[2-], and DOC in the paddy soil, but decreased the content of CaCl2-extractable Pb and Zn. The CaCl2-extractable Pb and Zn showed significant negative correlations with the pH, CEC, water-soluble SO4[2-], and DOC (p < 0.05). Following the application of biochar to the contaminated paddy soil, the Pb and Zn concentrations in the CaCl2 extracts were reduced by 41.04-98.66% and 17.78-96.87% (p < 0.05), respectively. Sequential chemical extractions showed a reduction in the acid-soluble Pb and Zn fraction and an increase in the reducible fraction following the addition of biochars. PBC obviously inhibited the uptake and accumulation of Pb and Zn in the rice plants. The Pb concentrations in the rice grain were significantly reduced by 60.32%, with the addition of 5% PBC. Neither of the biochars significantly changed the Zn concentrations in the rice grain. The influence of biochar on Pb and Zn phytoavailability varied not only with the application rate of biochar, but also with the kind of metals. Overall, the use of peanut shell biochar at a high application rate is more effective in immobilizing Pb and Zn in the acidic paddy soil contaminated with heavy metals, especially in reducing the phytoavailability of Pb to the rice plants. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/30149354/Effect_of_biochar_from_peanut_shell_on_speciation_and_availability_of_lead_and_zinc_in_an_acidic_paddy_soil_ DB - PRIME DP - Unbound Medicine ER -