Pedosphere 12(2): 97--102, 2002
ISSN 1002-0160/CN 32-1315/P
©2002 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of alkaline-stabilised sewage sludge on extractable organic carbon and copper in soils |
| LUO Yong-Ming1 and P. CHRISTIE2 |
1 Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China);
2 Department of Agricultural and Environmental Science, The Queen's University of Belfast, Newforge Lane, Belfast BT9 5PX (UK) |
| ABSTRACT |
| An incubation experiment was conducted to evaluate the potential for water contamination with sludge-derived organic substances and copper following land application of alkaline-stabilised sewage sludge. Two contrasting sludge-amended soils were studied. Both soils were previously treated with urban and ruralalkaline biosolids separately at sludge application rates of 0, 30 and 120 t ha-1 fresh product. The air-driedsoil/sludge mixtures were wetted with distilled water, maintained at 40 % of water-holding capacity andequilibrated for three weeks at 4 ℃ before extraction. Subsamples were extracted with either distilled wateror 0.5 mol L-1 K2SO4 solution. The concentrations of organic C in the aqueous and chemical extracts were determined directly with a total organic carbon (TOC) analyser. The concentrations of Cu in the twoextracts were also determined by atomic absorption spectrophotometry The relationship between the two extractable organic C fractions was examined, together with that between extractable organic C concentration and extractable Cu concentration. Application of alkaline biosolids increased the concentrations of soil mobile organic substances and Cu. The results are discussed in terms of a possible increase in the potential for leaching of sludge-derived organics and Cu in the sludge-amended soils. |
| Key Words: clay, extracts, leaching, organic matter, trace metals |
| Citation: Luo, Y. M. and Christie, P. 2002. Effect of alkaline-stabilised sewage sludge on extractable organic carbon and copper in soils. Pedosphere. 12(2): 97-102. |
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