title: Effect of two biogas residues' application on copper and zinc fractionation and release in different soils.
abstract: Biogas residue (BR) is widely used as a new green fertilizer in agriculture in China. However, it often contains a high concentration of heavy metals so its application should cause our concern. An incubation experiment was conducted to study the risk of pig biogas residue (PBR) and chicken biogas residue (CBR) application on Liuminying soil (LS) and Yixing soil (YS). The soils were incubated for one, three and six months with 0, 2%, 4% and 6% addition of BRs. According to BCR extraction results, the PBR and CBR applications induced an increase in the concentration of exchangeable fraction of Zn. As for the concentration of exchangeable fraction of Cu, an increase was only observed in the treatments with PBR application. The heavy metal binding intensity also showed a similar trend. With the PBR application, for the LS and YS, the highest concentrations of exchangeable Zn increased 3.6 and 9.5 times, respectively, while the exchangeable Cu was increased by 52.6% and 187.1%. Dissolved organic carbon was the limiting factor for the exchangeable Cu while the exchangeable Zn was controlled by soil pH. PBR presented more agricultural risk than CBR when used as fertilizer. Meanwhile, BRs were more adaptable to LS than YS according to the heavy metal release results.
authors: College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China. miaomiao19871021@126.com
authors: Miao
authors: M
authors: Chen
authors: College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
authors: Yanshan
authors: Y
authors: Cui
authors: College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
authors: Fan
authors: F
authors: Bai
authors: College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
authors: Jiaojiao
authors: J
authors: Wang
mesh_terms: D056804:Biofuels; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D010100:Oxygen / Q000032:analysis; D012989:Soil Pollutants / Q000737:chemistry* / Q000302:isolation & purification; D017550:Spectroscopy, Fourier Transform Infrared; D015032:Zinc / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D056804:Biofuels; D012989:Soil Pollutants; D003300:Copper; D015032:Zinc; D010100:Oxygen