Pedosphere 20(2): 245--251, 2010
ISSN 1002-0160/CN 32-1315/P
©2010 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Dynamics of humic substance-complexed copper and copper leaching during composting of chicken manure
WANG Xu-Dong, CHEN Xian-Ni, A. S. ALI, LIU Shuai and LU Li-Lan
College of Resource and Environment, Northwest A & F University, Yangling, Shaanxi 712100 (China)
      Chicken manure was composted for 110 d to evaluate changes in organic carbon (C) and humic substance-complexed copper (HS-Cu) extracted with water, sodium hydroxide (NaOH), and sodium pyrophosphate and sodium hydroxide mixture (Na4P2O7-NaOH). The average HS-Cu content from the Na4P2O7-NaOH extraction accounted for 46.8% of the total Cu in the compost, followed by those from the NaOH and water extractions, which accounted for 34.5% and 6% of the total Cu in the compost, respectively. NaOH-Na4P2O7-extractable HS-Cu increased throughout the composting process. NaOH-extractable HS-Cu increased during the first 50 d of composting and then leveled off. Water-extractable HS-Cu enhanced during the first 21 d and then decreased. Water-extractable HS-Cu was not correlated to NaOH-or NaOH-Na4P2O7-extractable organic C. The average amount of Cu leached from the compost was about 20% of the total Cu in the chicken manure and Cu leaching increased during the first 35 d of composting and then decreased. Leaching of Cu was significantly correlated to the concentrations of HS-Cu extracted with NaOH and water, but was not correlated to the concentration of HS-Cu extracted with NaOH-Na4P2O7. Thus, NaOH-and water-extractable HS-Cu were relatively labile and NaOH-Na4P2O7-extractable HS-Cu was relatively immobile. Composting process after rapid decomposition could result in low potential of Cu leaching because of formation of more NaOH-Na4P2O7-extractable HS-Cu.
Key Words:  humic substance, leaching, organic carbon
Citation: Wang, X. D., Chen, X. N., Ali, A. S., Liu, S. and Lu, L. L. 2010. Dynamics of humic substance-complexed copper and copper leaching during composting of chicken manure. Pedosphere. 20(2): 245-251.
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