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A review of environmental characteristics and effects of low-molecular weight organic acids in the surface ecosystem

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Journal of Environmental Sciences 2014年第5期26卷 935-954页

作者： Min Xiao Fengchang Wu State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences

low molecular weight organic acids （LMWOAs） are prevalent on the earth＇s surface. They are vital intermediate products during metabolic pathways of organic matter and participate in the tricarboxylic acid cycle during life activities. Photochemical reactions are pivotal for LMWOAs＇ origination and play a large role in determining their diversity and their ultimate fate. Within the long time that organic matter is preserved in sediments, it can be decomposed and converted to release organic and inorganic pollutants as well as C, N, and P nutrients, which are of potential ecological risk in causing secondary pollution to lake water. The sediment pool is a comprehensive and complex compartment closely associated with overlying water by various biochemical processes, during which LMWOAs play critical roles to transport and transform elements. This article elucidates geochemical behaviors of LMWOAs in the surface environment in details, taking natural water, soil, and aerosol as examples, focusing on reviewing research developments on sources and characteristics, migration and mineralization of LMWOAs and relevant environmental effects. Simultaneously, this review article depicts the categories and contents of LMWOAs or their contribution to DOC in environmental media, and evaluates their importance during organic matter early diagenesis. Through concluding and discussing the conversion mechanisms and influencing factors, the next research orientations on LMWOAs in lake ecosystems are determined, mainly concerning relationships with hydrochemical parameters and microorganisms, and interactions with pollutants. This will enrich the knowledge on organic matter degradation and related environmental effects, and help reconstruct a theoretical framework for organic compound succession and influencing factors, providing basic data for lake eutrophication and ecological risk assessment, conducive to better control over water pollution and proper management of water quality.

关键词： low molecular weight organic acids conversion mechanism pollutants environmental effects ecological risk management of water quality

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Spatial Distribution Characteristics of organic acids in Two Late-blooming Rhododendron Species

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Asian Agricultural Research 2022年第2期14卷 50-53,65页

作者： Jiangtao HAO Yuan JING Chaochan LI Guizhou Provincial Key Laboratory of Mountainous Environmental Protection Guizhou Normal University Guiyang 550001 China

[Objectives]The spatial distribution characteristics of organic acids in two late-blooming Rhododendron species(Rhododendron decorum and Rhododendron stamineum)in Guizhou Baili Rhododendron National Forest Park were explored,in order to provide reference for exploring the plant-soil relationship of subtropical forest.[Methods]The fresh leaf,stem,root,litter,humus and soil samples of *** and *** were *** contents of eight low molecular weight organic acids including oxalic acid,tartaric acid,malic acid,citric acid,acetic acid,lactic acid,succinic acid and formic acid were determined by high performance liquid chromatography(HPLC).[Results]Oxalic acid is the main organic acid in the two species of *** different samples,the content of organic acids was in the following order:root>fresh leaf>humus>litter>stem>soil.[Conclusions]The content of organic acids in the root was significantly higher than that in other *** types of organic acids in stems were the least.

关键词： Subtropical forest low molecular weight organic acids Spatial distribution

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天然有机酸对铀在特选榨菜中吸收与分布的影响（英文）

天然有机酸对铀在特选榨菜中吸收与分布的影响（英文）

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第二届全国核化学与放射化学青年学术研讨会

作者：祁芳芳杜良冯孝杰查忠勇秦冰王定娜张栋方振东金永东夏传琴四川大学化学学院中国工程物理研究院核物理与放射化学研究所后勤工程学院

This study aimed at exploring the mechanism on natural low molecular weight organic acids(LMWOAs) effects on uranium(U) accumulation and distribution in *** acid,malic acid,or mixture of citric acid/malic acid/oxalic acid/lactic acid were chosen as models,and Mustard(Brassica juncea ***) growing in China was selected as test *** and kinetics of U desorption from U-contaminated soil by organic acids was tested,LMWOAs effects on U speciation in soils were studied by sequential extraction *** U accumulation kinetics in plants in four organic acids series was ***,we fractioned plant tissues and assessed U distribution in roots,stems and leaves by using micro X-ray fluorescence(μ-XRF)*** results indicated that organic acids could increase uranium leaching yields from1%(control) to 46%-57%,and change the fraction of different uranium speciation in soil,especially increase the carbonate and exchangeable fraction of uranium.U accumulation kinetics in plants showed that addition of citric acid or mixed acid into exposure solution could enhance root-to-shoot translocation,but inhibit U accumulation in *** addition,μ-XRF analysis observed that U was distributed in vascular tissues and cortex in plant roots and mainly in vascular tissues in stems and leaves in control,while mainly in vascular tissues in the whole plants in citric acid *** results suggested that U might be accumulated and transported through vascular tissue in plant with citric acid ***,our observation would be helpful to properly develop efficient uranium phytoremediation.

关键词： Uranium low molecular weight organic acids Accumulation Distribution μ-XRF Phytoremediation

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