Extraction of aquatic organic matter by temperature decreasing: an alternative methodology to keep the original sample characteristics

Química Nova

Almeida, Rosana N. H. Martins de¹  Rocha, Julio Cesar¹  Universidade Estadual Paulista " Júlio de Mesquita Filho ", Araraquara¹  Mozeto, Antonio Aparecido¹  Romão, Luciane Pimenta Cruz¹  Sargentini Junior, Ézio¹  Universidade Católica de Brasília¹  Zara, Luiz Fabrício¹  Universidade Federal de São Carlos, São Carlos¹  Rosa, André Henrique¹  Universidade Federal do Sergipe, São Cristóvão¹  Instituto Nacional de Pesquisas da Amazônia, Manaus¹ 

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

DOI  :  10.1590/S0100-40422003000200012

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

Unknown