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Title: Extraction of aquatic organic matter by temperature decreasing: An alternative methodology to keep the original sample characteristics
Other Titles: Extração de matéria orgânica aquática por abaixamento de temperatura: Uma metodologia alternativa para manter a identidade da amostra
Authors: Almeida, Rosana N. H. Martins de
Mozeto, Antonio Aparecido
Zara, Luiz Fabrício
Rosa, André Henrique
Rocha, Júlio César
Rom?o, Luciane Pimenta Cruz
Sargentini, Ézio
Keywords: Organic Carbon
Organic Matter
River Water
Aqueous Solution
Chemical Composition
Infrared Spectroscopy
Separation Technique
Temperature Dependence
Thermal Analysis
Water Analysis
Water Sampling
Issue Date: 2003
metadata.dc.publisher.journal: Química Nova
metadata.dc.relation.ispartof: Volume 26, Número 2, Pags. 208-212
Abstract: 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.
metadata.dc.identifier.doi: 10.1590/S0100-40422003000200012
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