Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/6053
Título: Substâncias húmicas: sistema de fracionamento sequencial por ultrafiltração com base no tamanho molecular.
Autor(es): Julio Cesar Rocha
Luiz Fabrício Zara
André Henrique Rosa
Ézio Sargentini Junior
Peter Burba
Assunto: Rio Negro
fracionamento
Ultrafiltração
ISSN: 0100-4042
Revista: Química Nova
Volume: 23
Resumo: A sequential system for fractionation by ultrafiltration (SSFU) equipped with advanced membranes filters (molecular size cut-off: 5, 10, 30, 50 and 100 kDalton) of the polyethersulfone type was developed for analytical fractionation of humic substances (HS) extracted from aquatic systems or soils. The device consists of five membrane filters (Sartocon® Micro) operated by a multi-channel peristaltic pump, enabling an easy handling, working in a closed system and with simple collection of the six obtained fractions (F1>100; F2: 100-50; F3: 50-30; F4:30-10; F5: 10-5 and F6 <5 kDalton). Then, the HS sample (250 mL solution 1.0 mg/mL, pH 5.0 to 6.0) to be fractionated is pumped by pump through the series of membrane filters with a tangential flow of 85 mL/min, initial pressure 0.2 to 0.3 bar and permeation flux through the membranes of 0.8 to 1.4 mL/min. The overall time for fractionation and cleaning of the device is about 10 h and 25 mL of each fraction is obtained.
URI: http://repositorio.inpa.gov.br/handle/123/6053
ISSN: 0100-4042
DOI: http://dx.doi.org/10.1590/S0100-40422000000300020
Local de publicação: Brasil
Aparece nas coleções:Coordenação de Dinâmica Ambiental (CDAM)

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