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|Type:||Artigo de periódico|
|Title:||Adsorption And Preconcentration Of 2,4-dichlorophenoxyacetic Acid On A Chemically Modified Silica Gel Surface.|
|Author:||Prado, A G|
|Abstract:||The herbicide 2,4-dichlorophenoxyacetic acid (2,4-D), chemically anchored to a silica gel surface, was used to adsorb and preconcentrate the same herbicide from aqueous solutions at room temperature. From a series of adsorption isotherms adjusted to a modified Langmuir equation, the maximum number of moles adsorbed was calculated as 4.67 x 10(-5) mol g(-1), with the highest retention capacity at pH 5. This modified silica gel was used in a column for preconcentrating trace levels of 2,4-D. The preconcentrated herbicide can be directly eluted with methanol with a recovery efficiency higher than 97%. The concentration factor was 8.33.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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