溶解性有机质在矿物界面的分子分馏效应  

Molecular fractionation effects of dissolved organicmatter at mineral interfaces

作　　者：韦新东[1] 晁延续 WEI Xin-dong;CHAO Yan-xu(School of Municipal and Environment Engineering,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]吉林建筑大学市政与环境工程学院,吉林长春130118

出　　处：《吉林师范大学学报(自然科学版)》2025年第2期10-16,共7页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家外国专家局项目(P182009011)。

摘　　要：土壤有机质(SOM)是陆地生态系统最大的活性碳库,其中矿物结合态有机质占主导.溶解性有机质(DOM)成分复杂,其含量易受人类活动和土壤微生物活动影响而减少.土壤矿物与DOM的相互作用(如吸附、共沉淀)在矿物-水界面引发分子分馏,改变DOM的化学组成、结构、官能团和物理性质,影响其长期稳定性和环境行为,甚至对土壤中的碳固存产生影响.本文综述了DOM在矿物界面的非平衡态吸附/共沉淀现象,探讨了吸附分馏机制及影响因素,并分析了表征DOM分子分馏的多种方法.最后,展望了DOM溯源与特性表征的未来方向.Soil organic matter(SOM)constitutes the largest active carbon pool in terrestrial ecosystems,with mineral-bound organic matter dominating.Dissolved organic matter(DOM)is compositionally complex and susceptible to loss due to human activities and soil microbial processes.Interactions between soil minerals and DOM,such as adsorption and co-precipitation,induce molecular fractionation at the mineral-water interface,altering the chemical composition,structure,functional groups,and physical properties of DOM.These changes impact its long-term stability and environmental behavior,and have implications for carbon sequestration in soils.This paper reviews the non-equilibrium adsorption/coprecipitation phenomena of DOM at mineral interfaces,discusses the mechanisms and influencing factors of adsorptive fractionation,and analyzes various methods for characterizing DOM molecular fractionation.Finally,the future directions for tracing the sources and characterizing the properties of DOM are outlined.

关 键 词：吸附 共沉淀 DOM分子分馏 

分 类 号：X142[环境科学与工程—环境科学]