Simulated effects of metal load, soil organic matter and pH on the solubility of Cd, Cu and Zn in Fluvisols and Acrisols in SE Asia
(0) A multi-surface model including soil organic matter (SOM), hydrous ferric oxide (HFO) and clay minerals was used to test various scenarios on soils representing Vietnamese Fluvisols and Acrisols. Two sites located in peri-urban areas of Hanoi were used as well as data from the national soil inventories. The scenarios included (i) changing metal loading (Cd, Cu, Zn) up to the maximum acceptable soil concentration (MAC), and (ii) varying the SOM content and (Ⅲ) soil pH within the range being recorded in these soil groups. Cadmium and Zn accumulation in Acrisols up to the present MAC (Cd 2mg·kg<-1>, Zn 200mg·kg<-1>) might most probably lead to dissolved metal concentrations above the ground water quality standards (Cd 0.01mg·L<-1>, Zn 5.0mg·L<-1>) whereas in Fluvisols they were predicted below the thresholds. This might lead to risks for enhanced metal concentrations in agricultural products and drinking water jeopardizing human health. The MAC for Cu (50mg·kg<-1>) was estimated to give soluble concentrations below the water standard (<1.0mg(Cu)·L<-1>) for most Acfisols as well as for Fluvisols. SOM was a major factor regulating the metal solubility together with pH (for Cd, Zn). However, in the long term organic matter applied by biosolids and wastewater will decompose, potentially increasing the solubility of the metals being enriched in the soils.
biosolids cadmium copper organic waste risk assessment zinc
Nguyen Manh Khai Ingrid Oborn Jon Petter Gustafsson
Dep of Soil Sciences, Swedish University of Agricultural Sciences (SLU), P. O. Box 7014, SE-750 07 U Dep of Land and Water Resources Engineering, Royal Institute of Technology (KTH), Brinellv gen 28, S
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
103-104
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）