Extração de matéria orgânica aquática por abaixamento de temperatura: uma metodologia alternativa para manter a identidade da amostra

Química Nova

Rosana N. H. Martins De Almeida²  Antonio Aparecido Mozeto²  Luiz Fabrício Zara¹  André Henrique Rosa¹  Julio Cesar Rocha¹  Luciane Pimenta Cruz Romão¹  Ézio Sargentini Junior¹ 

[1] ,Universidade Federal de São Carlos Departamento de Química São Carlos SP

关键词: aquatic organic matter;    humic substances;    extraction;   

DOI  :  10.1590/S0100-40422003000200012

来源: SciELO

【 摘 要 】

In this work was developed an alternative methodology to separation of aquatic organic matter (AOM) present in natural river waters. The process is based in temperature decreasing of the aqueous sample under controlled conditions that provoke the freezing of the sample and separation of the dark extract, not frozen and rich in organic matter. The results showed that speed of temperature decreasing exerts strongly influence in relative recovery of organic carbon, enrichment and time separation of the organic matter present in water samples. Elemental composition, infrared spectra and thermal analysis results showed that the alternative methodology is less aggressive possible in the attempt of maintaining the integrity of the sample.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License