Buscar
Mostrando ítems 31-40 de 1200
Substâncias húmicas de turfa: estudo dos parâmetros que influenciam no processo de extração alcalina
(Sociedade Brasileira de Química, 2014)
Toxicity assessment of arsenic and cobalt in the presence of aquatic humic substances of different molecular sizes
(2017-05-01)
The release of contaminants in aquatic ecosystems can be influenced by humic acids. In this study, toxicity tests using environmentally relevant concentrations of arsenic and cobalt were conducted both in the presence 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 ...
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 ...
Structural description of humic substances from subtropical coastal environments using elemental analysis, FT-IR and 13C-solid state NMR data
(2005-01-01)
Elemental composition and spectroscopic properties (FT-IR and CP/MAS 13C-NMR) of sedimentary humic substances (HS) from aquatic subtropical environments (a lake, an estuary and two marine sites) are investigated. Humic ...
Soil P Diffusion and Availability Modified by Controlled-Release P Fertilizers
(Springer, 2020-11-24)
Slow-release fertilizers have been proposed as tools to increase P fertilizer use efficiency in tropical acidic soils with high P adsorption, low P availability, and mobility. However, results have been controversial since ...
Competition between humic substances and α-amino acids by metal species
(2004-08-30)
The aim of the present work was to carry out experimental comparison between humic substances (HS) and representative α-amino acids (methionine, methionine sulfoxide and cysteine hydrochloride) in relation to the complexation ...
Competition between humic substances and α-amino acids by metal species
(2004-08-30)
The aim of the present work was to carry out experimental comparison between humic substances (HS) and representative α-amino acids (methionine, methionine sulfoxide and cysteine hydrochloride) in relation to the complexation ...