Ion exchange chromatography of fulvic acids from lignite
Ion exchange chromatography using a macroreticular resin was applied to fulvic acids. Two stepwise gradient methods were used and the fractions obtained were analysed by infrared spectroscopy. An ionic-strength gradient produced more extensive fractionation than a methanol gradient, but resolution b...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 1987 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/167690 |
| Acceso en línea: | http://hdl.handle.net/10261/167690 |
| Access Level: | acceso abierto |
| Palabra clave: | Lignite Fulvic acids Chromatography |
| Sumario: | Ion exchange chromatography using a macroreticular resin was applied to fulvic acids. Two stepwise gradient methods were used and the fractions obtained were analysed by infrared spectroscopy. An ionic-strength gradient produced more extensive fractionation than a methanol gradient, but resolution by chemical nature was better achieved with the methanol gradient at low pH. Washing of the column after the treatment allowed elution of a small fraction whose features differed substantially from those of the other fractions or the original fulvic acids. From the fractions so obtained, fulvic acids would appear to be complex mixtures of substances. |
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