Storage effects on quantity and composition of dissolved organic carbon and nitrogen of lake water, leaf leachate and peat soil water

WATER RESEARCH

卷:130

Article

Heinz, Marlen^1,4  Zak, Dominik^1,2,3 

[1] Leibniz Inst Freshwater Ecol & Inland Fisheries I, Dept Chem Analyt & Biogeochem, Muggelseedamm 301, D-12587 Berlin, Germany

[2] Univ Rostock, Fac Agr & Environm Landscape Ecol & Site Evaluat, Justus von Liebig Weg 6, D-18059 Rostock, Germany

[3] Aarhus Univ, Dept Biosci, Vejlsovej 25, DK-8600 Silkeborg, Denmark

[4] Julius Kuhn Inst, Fed Res Ctr Cultivated Plants, Inst Ecol Chem Plant Anal & Stored Prod Protect, Konigin Luise Str 19, D-14195 Berlin, Germany

关键词: Freezing;    Cold storage;    Size exclusion chromatograpy (SEC);    Dissolved organic nitrogen (DON);    Dissolved organic carbon (DOC);   

DOI  :  10.1016/j.watres.2017.11.053

来源: Elsevier

【 摘 要 】

This study aimed to evaluate the effects of freezing and cold storage at 4 degrees C on bulk dissolved organic carbon (DOC) and nitrogen (DON) concentration and SEC fractions determined with size exclusion chromatography (SEC), as well as on spectral properties of dissolved organic matter (DOM) analyzed with fluorescence spectroscopy. In order to account for differences in DOM composition and source we analyzed storage effects for three different sample types, including a lake water sample representing freshwater DOM, a leaf litter leachate of Phragmites australis representing a terrestrial, 'fresh' DOM source and peatland porewater samples. According to our findings one week of cold storage can bias DOC and DON determination. Overall, the determination of DOC and DON concentration with SEC analysis for all three sample types were little susceptible to alterations due to freezing. The findings derived for the sampling locations investigated here may not apply for other sampling locations and/or sample types. However, DOC size fractions and DON concentration of formerly frozen samples should be interpreted with caution when sample concentrations are high. Alteration of some optical properties (HIX and SUVA(254)) due to freezing were evident, and therefore we recommend immediate analysis of samples for spectral analysis. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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