Characterisation of aquatic humic and non-humic matter with size-exclusion chromatography--organic carbon detection--organic nitrogen detection (LC-OCD-OND) |
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Authors: | Huber Stefan A Balz Andreas Abert Michael Pronk Wouter |
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Affiliation: | a DOC-LABOR Dr. Huber, Eisenbahnstr. 6, 76229 Karlsruhe, Germanyb Eawag, Swiss Federal Institute of Aquatic Science and Technology, P.O. Box 611, 8600 Dübendorf, Switzerland |
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Abstract: | Size-exclusion chromatography in combination with organic carbon detection (SEC-OCD) is an established method to separate the pool of NOM into major fractions of different sizes and chemical functions and to quantify these on the basis of organic carbon. One specific approach, also known as LC-OCD-OND, is based on the Gräntzel thin-film UV-reactor. This approach is described with recent improvements in fraction assignation (humic substances, biopolymers, building blocks, low molecular weight organic acids and neutrals, hydrophobic organic carbon), the coupling of a novel organic nitrogen detector (OND), and an improved diagram for the characterisation of aquatic humic substances (HS-diagram). The diagram replaces the operational distinction between humic and fulvic acids by a continuum ranging from aquagenic fulvic acids to pedogenic humic acids. |
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Keywords: | Humic substances Fulvic acids Humic acids HS-diagram Organic carbon detector SEC Nitrogen detector Biopolymers EfOM |
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