Biodegradation processes of natural low molecular weight organic acid-heavy metal complexes in three tropical soils
The biodegradation experiments of natural low molecular weight organic acids (LMWOAs), citric acid, malonic acid and oxalic acid, complexed with Ccl, Cu and Pb applied to three soils with different physio- chemical properties were conducted to explore the mineralization pattern of LMWOAs-metal complexes associated with the bioavailability of the metals. The results indicate that LMWOAs-metal complexes in the neutral loamy soil (Hb) were mineralized completely in the dark during 9 day period. In neutral-alkaline soil (Sp), citric and oxalic-Pb complexes were biodegradaded by 14.1％ and 57. 5％, respectively, much less compared with the other complexes. Most of the LMWOAs-metal complexes in acidic soil (Lo), however, are hardly mineralized and the rate of biodegradation range from 0. 2％ to 84. 8％. Regarding the bioavailability of the metals in soils, the concentrations of target metals in soil solution in the LMWOAs-metals treatments were lower than those in metal spiked alone treatments through the experimental period.
Bioavailability biodegradation complex heavy metal organic acid rhizosphere
P. H. Kao Z. Y. Hseu
Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
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
615-616
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）