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

Quimica nova

Rocha, Julio Cesar¹  Romão, Luciane Pimenta Cruz²  Zara, Luiz Fabrício⁴  Sargentini Junior, Ézio⁵  Rosa, André Henrique⁵  Almeida, Rosana N. H. Martins de⁶  Mozeto, Antonio Aparecido⁶ 

[1] Júlio de Mesquita Filho ", Araraquara;Instituto Nacional de Pesquisas da Amazônia, Manaus;Universidade Católica de Brasília;Universidade Estadual Paulista "Universidade Federal de São Carlos, São Carlos;Universidade Federal do Sergipe, São Cristóvão

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 thiswork was developed an alternative methodology to separation of aquatic organicmatter (AOM) present in natural river waters. The process is based in temperaturedecreasing of the aqueous sample under controlled conditions that provoke thefreezing of the sample and separation of the dark extract, not frozen and richin organic matter. The results showed that speed of temperature decreasing exertsstrongly influence in relative recovery of organic carbon, enrichment and timeseparation of the organic matter present in water samples. Elemental composition,infrared spectra and thermal analysis results showed that the alternative methodologyis less aggressive possible in the attempt of maintaining the integrity of thesample.

【 授权许可】

CC BY