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A structural conformation study of aquatic humic acid
(2006-10-16)
In the present work, aquatic humic substances (HS) were extracted by use of adsorbent XAD 8 and the acid humic fraction (AH) was separated throught acidification. After being purified by Hyphan resin and dialyze, the aquatic ...
Reduction of mercury(II) by tropical river humic substances (Rio Negro) - Part II. Influence of structural features (molecular size, aromaticity, phenolic groups, organically bound sulfur)
(Elsevier B.V., 2003-12-04)
The influence of structural features of tropical river humic substances (HS) on their capability to reduce mercury(II) in aqueous solutions was studied. The HS investigated were conventionally isolated from Rio Negro ...
Lability of Cd, Cr, Cu, Mn and Pb complexed by aquatic humic substances
(Editora Unesp, 2005-01-01)
A labilidade de Cd, Cr, Cu, Mn e Pb complexados por substâncias húmicas aquáticas (HSs) foi investigada por estudos de troca iônica em batelada, utilizando-se celulose modificada com grupos p-aminobenzóico (Cell-PAB). As ...
Estudo da labilidade de Cu(II), Cd(II), Mn(II) e Ni(II) em substâncias húmicas aquáticas utilizando-se membranas celulósicas organomodificadas
(Sociedade Brasileira de Química, 2007-02-01)
In this work commercial filters papers were organomodified with tetraethylorthosilicate (TEOS) and 3-aminopropyltriethoxysilane (3-APTS), aiming at the development of a new analytical procedure for in-situ speciation of ...
Fractionation of aquatic humic substances and dynamic of chromium species in an aquatic body influenced by sugarcane cultivation
(Sociedade Brasileira de Química, 2014)
Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
(Sociedade Brasileira de Química, 2002-12-01)
In this work the metal distribution and exchange constants between metal species and aquatic humic fractions with different molecular sizes were studied. The aquatic humic substances (AHS) were extracted by XAD-8 resin ...
Tangential-flow ultrafiltration: a versatile methodology for determination of complexation parameters in refractory organic matter from Brazilian water and soil samples
(Springer, 2003-04-01)
In this work the copper(II) complexation parameters of aquatic organic matter, aquatic and soil humic substances from Brazilian were determined using a new versatile approach based on a single-stage tangential-flow ...