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Occurrence of Cu and Cr in the sedimentary humic substances and pore water from a typical sugar cane cultivation area in São Paulo, Brazil
(2013-08-16)
Purpose: The purpose of this paper is to study the interactions of sedimentary humic substances (SHS) from a sugarcane cultivation area with Cu(II) and Cr(III) and to evaluate the occurrence of these metals in the pore ...
Multi-method Study on Aquatic Humic Substances from the Rio Negro - Amazonas State/Brazil: Emphasis on Molecular-Size Classification of their Metal Contents
(Sociedade Brasileira de Química, 1999-01-01)
As substâncias húmicas aquáticas investigadas foram convencionalmente extraídas de amostra de água coletada no Rio Negro - AM, Brasil utilizando-se resina XAD 8. Investigações usando ressonância nuclear magnética de próton ...
Distribution of Cr, Ni, Cu, Cd and Pb in different molecular size of humic fractions extracted from water and sediment samples collected at Anhumas reservoir - Araraquara/SP
(Editora Unesp, 2002-01-01)
In this work was studied the distribution of Cr, Ni, Cu, Cd and Pb in humic fractions with different molecular size. The HS were extracted from waters (AHS), surface sediments (HESS), interface water sediment (HSIS) and ...
Multimethod study of the degree of humification of humic substances extracted from different tropical soil profiles in Brazil's Amazonian region
(Elsevier B.V., 2005-07-01)
This work consisted of determining the degree of humification of humic substances (HS) extracted from six different Amazonian soils collected from flooded and unflooded regions at different depths (0-10, 10-20, 20-40, and ...
Structural description of humic substances from subtropical coastal environments using elemental analysis, FT-IR and C-13-solid state NMR data
(Coastal Education & Research Foundation, 2005-03-01)
Elemental composition and spectroscopic properties (FT-IR and CP/MAS C-13-NMR) of sedimentary humic substances (HS) from aquatic subtropical environments (a lake, an estuary and two marine sites) are investigated. Humic ...
Performance of pre-sprouted sugarcane seedlings in response to the application of humic acid and plant growth-promoting bacteria
(Semina: Ciências Agrárias, 2019)
Thermodynamic characterization of humic acid-surfactant interaction: New insights into the characteristics and structure of humic acids
(Revista Brasileira de Ciência do Solo, 2017)
Reduction of mercury(II) by tropical river humic substances (Rio Negro) - A possible process of the mercury cycle in Brazil
(Elsevier B.V., 2000-12-04)
The evolution of elemental Hg from its environmental compounds has already been supposed to be an important process within the global mercury cycle. The present study characterizes the abiotic reduction of Hg(II) ions by ...