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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Development of a simple and versatile ultrafiltration system for the fractionation of aquatic humic substances

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Author(s):
Pantano, Glaucia [1] ; Tadini, Amanda M. [1] ; Bisinoti, Marcia Cristina [1] ; Moreira, Altair B. [1] ; dos Santos, Ademir [2] ; de Oliveira, Luciana Camargo [3] ; Martin, Cibely S. [4]
Total Authors: 7
Affiliation:
[1] Univ Estadual Paulista, Dept Quim Ciencias & Ambientais, Inst Biociencias Letras & Ciencias Exatas, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
[2] Univ Estadual Paulista, Inst Quim Araraquara, BR-14800900 Araraquara, SP - Brazil
[3] Univ Fed Sao Carlos UFSCAR, BR-18052780 Sorocaba, SP - Brazil
[4] Univ Estadual Paulista, Dept Quim Fis & Biol, Fac Ciencia & Tecnol, BR-19060900 Presidente Prudente, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Organic Geochemistry; v. 43, p. 156-161, FEB 2012.
Web of Science Citations: 7
Abstract

A new fractionation system using membrane ultrafiltration was developed and applied to aqueous extracts of humic substances (HSs). Four polyethersulfone membranes of molecular weight cut offs of 10, 30, 50 and 100 kDa were used. The system was quite efficient in fractionating HSs with different molecular sizes. HS fractions were characterized by Fourier transform infrared spectroscopy and ultraviolet/visible spectrophotometry to obtain E-2/E-3 ratios, which describe the aromaticity of the fractions. The E-2/E-3 ratios were in agreement with those obtained using current commercial systems, and FTIR spectra of all fractions presented characteristic bands of the HSs. Therefore, it can be concluded that this system is a simple, versatile and low cost alternative to the current systems on the market. (C) 2011 Elsevier Ltd. All rights reserved. (AU)