Accumulation of metals by particulate organic matter in soils: abiotic versus biotic processes?

摘要：

Particulate organic matter (POM), defined as sand- sized organic particles in soils, is known as a labile organic component with a rapid turnover. Recently, POM was identified as a metal-enriched organic fraction in both metal-contaminated and uncontaminated soils. The mechanisms for such metal- enrichment are poorly understood, as there is little information on the chemical properties of POM and the fate of metal-associated POM during biodegradation. In this work, we investigated the relative enrichment of metals in POM and the intrinsic reactivity of POM. The results show that total metal concentrations increased with decreasing POM size, but also that metal extractability decreased with decreasing particle size. Finer POM fractions were found to exhibit the highest contents in reactive sites. These finding suggest a role of fine POM fractions as a metal sink in soils.

关键词： Particulate organic matter metal enrichment microanalysis EDTA extraction surface reactivity

作者: I. Lamy J. Sebastia J. Labanowski F van Oort

作者单位: INRA, UR251-PESSAC, RD 10, F-78026 Versailles Cedex, France

会议类型: 国际会议

会议名称: 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)

会议地点: 北京

会议语种:英文

页码: 332-333

在线出版日期: 2007-07-15（万方平台首次上网日期，不代表论文的发表时间）