首页|Investigation of low-molecular weight organic acids and their spatiotemporal variation characteristics in Hongfeng Lake, China

Investigation of low-molecular weight organic acids and their spatiotemporal variation characteristics in Hongfeng Lake, China

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The identities and concentrations of low-molecular-weight organic acids (LMWOAs) were determined by ion chromatography throughout a 20-m water column in Hongfeng Lake,China.The spatiotemporal variations of LMWOAs and their contributions to dissolved organic matter (DOM) in a research period of 24 hr were also investigated.The results demonstrated that five LMWOAs (lactic,acetic,pyruvic,sorbic,oxalic acid) were detected,and their total concentration and proportion in DOC were 6.55 μmol/L and 7.47％.Their average levels were 2.50,0.65,2.35,0.96 and 0.09 μmol/L,respectively.LMWOAs were higher during daytime (10:00-18:00 on Jun 13,2008) than nighttime (21:00-6:00 the next morning),in particular 4.99 μmol/L high in the epilimnion (≤ 1rn water depth),reflecting the fact that direct import from terrigenous sources and photochemical production from humic materials were dominant during LMWOAs' origin and accumulation.The same factors caused LMWOAs to be 0.63 μmol/L in the epilimnion higher than in the hypolimnion.The rapid decrease of total organic acid (TOA) up until 18:00 mainly resulted from bio-uptake and mineralization in the hypolimnion (＞ 1 m water depth).Pyruvic acid increased with time in the epilimnion and decreased in the hypolimnion,largely related to the two contrary processes of continuous degradation and synthesis of macromolecular organic matter during life materials' cycle mediated by organisms.Simultaneously,plankton behavior and thermal stratification played a pivotal role in LMWOAs' behavior in the water column,causing decreasing and increasing profiles.The distribution of LMWOAs represents an interesting resource for biogeochemical research of DOM in aquatic ecosystems.

Hongfeng Lakelow-molecular-weight organic acidsphotochemical productionspatiotemporal variationsthermal stratification

Min Xiao、Fengchang Wu、Liying Wang、Xinqing Li、Rongsheng Huang

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State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

Chinese Research Academy of Environmental Sciences, Beijing 100012, China

National Basic Research Program (973) of ChinaNational Basic Research Program (973) of China国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Chinese Research Academy of Environmental Sciencesexperiments complied with current laws of the country in which they were performed

2008CB4182002008CB41800041003055U083360340632011408730802007KYYW01

2013

10.1016/S1001-0742(12)60042-4

环境科学学报(英文版)
中科院生态环境研究中心

环境科学学报(英文版)

CSTPCDCSCDSCIEI
影响因子：0.862
ISSN：1001-0742
年,卷(期)：2013.25(2)
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