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Mostrando ítems 11-20 de 999
An alternative methodology for the extraction of humic substances from organic soils
(1998-12-01)
The present study reports on an alternative methodology for the extraction of Humic Substances (HS) from the soil. The extractions were carried out with 0.5 M KOH for 3 h, at a ratio of 1:20 (m/v) under a nitrogen atmosphere. ...
Studies on the interaction between humic substances and conducting polymers for sensor application
(2005-01-01)
The interaction between humic substances and poly(o-ethoxyaniline) (POEA), a conducting polymer, was investigated for both solution and self-assembled films. The results have shown that the humic substances induce a doping ...
Studies on the interaction between humic substances and conducting polymers for sensor application
(2005-01-01)
The interaction between humic substances and poly(o-ethoxyaniline) (POEA), a conducting polymer, was investigated for both solution and self-assembled films. The results have shown that the humic substances induce a doping ...
Substâncias húmicas de turfa: estudo dos parâmetros que influenciam no processo de extração alcalina
(Sociedade Brasileira de Química, 2000-08-01)
This study reports the parameters which influence on extraction of humic substances (HS) from peat. The yield, organic and inorganic contend, E4/E6 ratio and elemental composition (C,H,N) of the extracted HS have been ...
Substâncias húmicas de turfa: estudo dos parâmetros que influenciam no processo de extração alcalina
(Sociedade Brasileira de Química, 2000-08-01)
This study reports the parameters which influence on extraction of humic substances (HS) from peat. The yield, organic and inorganic contend, E4/E6 ratio and elemental composition (C,H,N) of the extracted HS have been ...
Atrazine interaction with tropical humic substances by Enzyme Linked Immunosorbent Assay
(E D P Sciences, 2014)
A new application of humic substances: Activation of supports for invertase immobilization
(2000-12-01)
Invertase was immobilized on aminopropyl silica (APTS-SiO2) activated with humic substances (APTS-SiO2-HS) and on aminopropyl silica activated with glutaraldehyde (APTS-SiO2-GA). The resulting activity of both systems was ...
A new application of humic substances: Activation of supports for invertase immobilization
(2000-12-01)
Invertase was immobilized on aminopropyl silica (APTS-SiO2) activated with humic substances (APTS-SiO2-HS) and on aminopropyl silica activated with glutaraldehyde (APTS-SiO2-GA). The resulting activity of both systems was ...
TRACE METAL THERMODYNAMIC SPECIATION WITH HUMIC SUBSTANCES: THE NICA-DONNAN MODEL
(Soc Brasileira Quimica, 2017-10-01)
This work presents a critical overview of the NICA-Donnan model for trace metal thermodynamic speciation with humic substances obtained from natural organic matter in soils, natural waters and anthropogenic sources. A first ...