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Effect of sulfur and sulfur-iron modified biochar on cadmium availability and transfer in the soil-rice system.
Chemosphere. 2019 May; 222:314-322.C

Abstract

Cadmium (Cd) contamination in paddy soils has aroused global concern. Sulfur modified biochar (BC) could combine the benefits of BC and S for Cd remediation. However, no information is available on the impact of sulfur modified biochar on Cd phytoavailability in paddy soils. In this study, a pot experiment was conducted to investigate the effect of sulfur modified biochar (S-BC) and sulfur and iron (Fe) modified biochar (S-Fe BC) on Cd mobility and Cd transfer in the soil-rice system. The application of S-BC and S-Fe BC effectively reduced pore water Cd in the rhizosphere and non-rhizosphere pore water throughout the rice growth stages. S-BC and S-Fe BC addition increased the total chlorophyll content, as well as the root, shoot and grain biomasses of rice. Furthermore, S-BC and S-Fe BC amendments greatly increase the formation of Fe plaque on rice root surface, thus decreasing Cd accumulation in different rice tissues. In particular, S-Fe BC supplementation significantly reduced the Cd concentration in rice grains to 0.018 mg kg-1 in Cd-contaminated soil, which was lower than the China National standard for food contamination limit (0.2 mg kg-1 Cd). Sequential extraction results showed that S-BC and S-Fe BC can promote the transfer of exchangeable Cd to Fe-Mn oxide, organic and residual bound forms which reduce Cd in paddy soils. Thus, the amendment of S-Fe BC to Cd-contaminated paddy soil is an effective strategy to decrease Cd accumulation in rice grains and thereby protect public health.

Authors+Show Affiliations

School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510530, PR China.School of Metallurgy and Environment, Central South University, Changsha 410083, PR China. Electronic address: wuchuan@csu.edu.cn.Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, Hong Kong, China.School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.School of Metallurgy and Environment, Central South University, Changsha 410083, PR China. Electronic address: sgxue@csu.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30708165

Citation

Rajendran, Manikandan, et al. "Effect of Sulfur and Sulfur-iron Modified Biochar On Cadmium Availability and Transfer in the Soil-rice System." Chemosphere, vol. 222, 2019, pp. 314-322.
Rajendran M, Shi L, Wu C, et al. Effect of sulfur and sulfur-iron modified biochar on cadmium availability and transfer in the soil-rice system. Chemosphere. 2019;222:314-322.
Rajendran, M., Shi, L., Wu, C., Li, W., An, W., Liu, Z., & Xue, S. (2019). Effect of sulfur and sulfur-iron modified biochar on cadmium availability and transfer in the soil-rice system. Chemosphere, 222, 314-322. https://doi.org/10.1016/j.chemosphere.2019.01.149
Rajendran M, et al. Effect of Sulfur and Sulfur-iron Modified Biochar On Cadmium Availability and Transfer in the Soil-rice System. Chemosphere. 2019;222:314-322. PubMed PMID: 30708165.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of sulfur and sulfur-iron modified biochar on cadmium availability and transfer in the soil-rice system. AU - Rajendran,Manikandan, AU - Shi,Lizheng, AU - Wu,Chuan, AU - Li,Waichin, AU - An,Wenhui, AU - Liu,Ziyu, AU - Xue,Shengguo, Y1 - 2019/01/26/ PY - 2018/10/03/received PY - 2019/01/02/revised PY - 2019/01/25/accepted PY - 2019/2/2/pubmed PY - 2019/4/4/medline PY - 2019/2/2/entrez KW - Biochar KW - Cadmium KW - Iron plaque KW - Oryza sativa L KW - Sulfur and iron modified biochar SP - 314 EP - 322 JF - Chemosphere JO - Chemosphere VL - 222 N2 - Cadmium (Cd) contamination in paddy soils has aroused global concern. Sulfur modified biochar (BC) could combine the benefits of BC and S for Cd remediation. However, no information is available on the impact of sulfur modified biochar on Cd phytoavailability in paddy soils. In this study, a pot experiment was conducted to investigate the effect of sulfur modified biochar (S-BC) and sulfur and iron (Fe) modified biochar (S-Fe BC) on Cd mobility and Cd transfer in the soil-rice system. The application of S-BC and S-Fe BC effectively reduced pore water Cd in the rhizosphere and non-rhizosphere pore water throughout the rice growth stages. S-BC and S-Fe BC addition increased the total chlorophyll content, as well as the root, shoot and grain biomasses of rice. Furthermore, S-BC and S-Fe BC amendments greatly increase the formation of Fe plaque on rice root surface, thus decreasing Cd accumulation in different rice tissues. In particular, S-Fe BC supplementation significantly reduced the Cd concentration in rice grains to 0.018 mg kg-1 in Cd-contaminated soil, which was lower than the China National standard for food contamination limit (0.2 mg kg-1 Cd). Sequential extraction results showed that S-BC and S-Fe BC can promote the transfer of exchangeable Cd to Fe-Mn oxide, organic and residual bound forms which reduce Cd in paddy soils. Thus, the amendment of S-Fe BC to Cd-contaminated paddy soil is an effective strategy to decrease Cd accumulation in rice grains and thereby protect public health. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/30708165/Effect_of_sulfur_and_sulfur_iron_modified_biochar_on_cadmium_availability_and_transfer_in_the_soil_rice_system_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(19)30165-1 DB - PRIME DP - Unbound Medicine ER -