Results 171 to 180 of about 63,548 (216)

Americium Binding to Humic Acid

Environmental Science & Technology, 2001
The binding of americium (Am) by peat humic acid (PHA) has been investigated at Am concentrations between 10(-1) and 10(-7) M at pH approximately 2.6 in the presence and absence of Cu as a competing ion. Cu-PHA binding was also investigated in order to derive independent binding constants for use in modeling the competitive binding studies.
Peters, Adam J., Hamilton-Taylor, John, Tipping, Edward   +2 more
openaire   +2 more sources

Iodinated humic acids

2005
Humic acids are iodinated by elemental iodine and, if the iodine is present as iodide, by peroxidase-mediated reactions. It is demonstrated that iodination of humic acids leads to a product with a uniform distribution of iodine. It could not be unambiguously verified whether the enzymatically mediated iodination is a direct reaction between a ...
Jesper V. Christiansen, Lars Carlsen
openaire   +1 more source

Electrophoretic aggregation of humic acid

Journal of Chromatography A, 2004
Capillary electrophoresis (CE) has been used to characterize humic acid (HA) aggregation. It was found that when pumping HA solution through the capillary at a constant flow rate with no electric field, the number of spikes could be reduced by filtration of the solution. Applying high voltage (30 kV), the amount of spikes increased again.
Monika, Ubner, Viia, Lepane, Margus, Lopp, Mihkel, Kaljurand   +3 more
openaire   +2 more sources

Humic acid: Inhibitor of plasmin

Science of The Total Environment, 1992
Synthetic humic acid, well water humic acid and commercial humic acid (Aldrich) all have the ability to inhibit human plasmin activity. At a concentration of 20 micrograms/ml, all three species will result in 93%, 70% and 40% of residual plasmin activity, respectively. The components of humic acid, such as protocatechuic acid, resorcinol, vanillic acid
F J, Lu, Y S, Lee
openaire   +2 more sources

Antiviral properties of humic acids

Experientia, 1972
Es wird ein antiviraler Effekt von Ammoniumhumat gegenuber Coxsackiervirus A9 in FL-Zellkulturen nachgewiesen. Die antivirale Wirkung ist auf den Humatanteil des Molekuls zuruckzufuhren.
R, Klöcking, M, Sprössig
openaire   +2 more sources

Adsorption of Humic Substances on Goethite:  Comparison between Humic Acids and Fulvic Acids

Environmental Science & Technology, 2006
The adsorption of humic acids (HA) to goethite (at pH 3-11) and the proton co-adsorption (at pH 4.0, 5.5, and 7.0) were measured, and the results were compared to those of fulvic acids (FA). Compared to FA, the adsorption of HA is stronger and more ionic strength dependent. The adsorption of both HA and FA decreases with increasing pH.
Weng, L.P., van Riemsdijk, W.H., Koopal, L.K., Hiemstra, T.   +3 more
openaire   +2 more sources

Effect of humic acid source on humic acid adsorption onto titanium dioxide nanoparticles

Science of The Total Environment, 2014
In many studies, different humic acid (HA) sources are used interchangeably to evaluate the effect of organic matter on geochemical processes in the environment. This research looks more specifically at the effect of HA source on HA adsorption onto nano-TiO2 and how HA adsorption affects the fate and transport of nano-TiO2.
Mohamed, Erhayem, Mary, Sohn
openaire   +2 more sources

Chemiluminescence of Humic Acids

Nature, 1967
THE concept that humic acids (HA) are heteropolycondensates of phenolic substances is now widely accepted1,2. All the humic acids have hydroxyl, methoxy, or carbonyl groups connected with the aromatic parts of the nucleus. Our earlier investigations suggested that oxidation of hydroxyl groups attached to the aromatic ring may be accompanied by ...
DANUTA SŁAWIŃSKA, JANUSZ SŁAWIŃSKI
openaire   +1 more source

Arsenic humic acid reactions

UNISWA Research Journal of Agriculture, Science and Technology, 2007
No Abstract. Uniswa Research Journal of Agriculture, Science and Technology Vol. 9 (1) 2006: pp.
Thwala, J, Inam, E, Hall, A, Warwick, P
openaire   +2 more sources

Humic acid reactions with amino acids

Soil Biology and Biochemistry, 1974
Abstract Reactions between five humic acids extracted from soils with widely differing pedological histories and 17 amino acids commonly occurring in proteins were investigated in aqueous solutions at pH 3.0 and 6.5. The reactions were affected by: (a) nature of the humic acid: (b) pH of the system: and (c) length of contact.
M. Schnitzer, F.J. Sowden, K.C. Ivarson
openaire   +1 more source