Effect of Alkaline-Stabilised Sewage Sludge on Extractable Organic Carbon and Copper in Soils  

作　　者：LUOYONGMING P.CHRISTIE 

机构地区：[1]InstituteofSoilScience,theChineseAcademyofSciences,Nanjing210008（China） [2]DepartmentofAgriculturalandEnvironmentalScience,TheQueen′sUniversityofBelfast,NewforgeLane,BelfastBT95PX（U

出　　处：《Pedosphere》2002年第2期97-102,共6页土壤圈（英文版）

基　　金：National Natural Science Foundation of China(No.49831070 and 40125005);theNational Key Basic Research Support Foundation (NKBRSF) of China (No. G1999011807) ; the Jiangsu Provincial Foundation for Young Scientists (No. BQ98050).

摘　　要：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. Twocontrasting 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 extractswere 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 twoextractable organic C fractions was examined, together with that between extractable organic C concentrationand extractable Cu concentration. Application of alkaline biosolids increased the concentrations of soil mobileorganic substances and Cu. The results are discussed in terms of a possible increase in the potential forleaching of sludge-derived organics and Cu in the sludge-amended soils.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. Twocontrasting 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 extractswere 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 twoextractable organic C fractions was examined, together with

关 键 词：clay extracts leaching organic matter trace metals 

分 类 号：S151.9[农业科学—土壤学]