Results 201 to 210 of about 11,355 (259)

Activation of persulfate by humic substances: Stoichiometry and changes in the optical properties of the humic substances

Water Research, 2022
Persulfate activation through electron transfer from humic substances (HS) was investigated. Persulfate consumption in the presence of standard HS and HS model compounds linearly correlated with the phenol contents of the HS. Redox-active carbonyl groups such as aromatic ketones and quinone also contributed to persulfate consumption by donating ...
Cheolyong, Kim, Yu-Ping, Chin, Heejong, Son, Inseong, Hwang   +3 more
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Immobilized humic substances as sorbents

Chemosphere, 2006
A new method was developed for the immobilization of humic substances. Humic acids (HA) immobilized onto different carriers were studied as sorbents for organic and inorganic substances. The sorption isotherms of 4-aminoazobenzene, Crystal Violet, Methylene Green, and flavine mononucleotide on immobilized HA show that pH and salt concentration have a ...
Maris, Klavins, Linda, Eglite, Andris, Zicmanis   +2 more
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IAA detection in humic substances

Soil Biology and Biochemistry, 1998
The aim of the work was to verify if humic substances conaine auxin component able to justify its biological activity. To this aim various preparations of anti-IAA antibodies were used. Quantitative determinations of IAA in HS was corried out using an enzyme immunoassay, Phytodetek-IAA.
MUSCOLO A, CUTRUPI S, NARDI, SERENELLA
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Antioxidant Properties of Humic Substances

Environmental Science & Technology, 2012
Humic substances (HS) are heterogeneous, redox-active organic macromolecules. While electron transfer to and from HS under reducing conditions is well investigated, comparatively little is known on the electron donating (i.e., antioxidant) properties of HS under oxic conditions.
Aeschbacher M, Graf C, Schwarzenbach RP, Sander M   +3 more
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Protein Encapsulation by Humic Substances

Environmental Science & Technology, 2011
Protein encapsulation by natural organic matter is hypothesized to preserve the activity of proteins in terrestrial and aquatic environments. Direct molecular-level evidence for encapsulation of net positively charged proteins lysozyme, trypsin, and ribonuclease A by a diverse set of humic substances (HS) in nanostructured films was collected using a ...
Tomaszewski JE, Schwarzenbach RP, Sander M   +2 more
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Effects of pollution on humic substances

Journal of Environmental Science and Health, Part B, 1980
To assess effects of industrial and environmental pollution on analytical characteristics of humic substances, we isolated humic acids (HA's) and fulvic acids (FA's) from unpolluted and polluted soils and sediments. Following purification, the HA's and FA's were characterized by elemental (C, H, O, N, S) and functional group (CO2H, phenolic OH, total ...
M, Schnitzer, H, Kerndorff
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Antiandrogenic activity of humic substances

Science of The Total Environment, 2012
For long, natural organic matter (NOM) composed mainly of humic substances (HS) were regarded as inert in the ecosystems with respect to their possible chemical interaction with exposed organisms. However recently, NOM have been shown to elicit various adverse effects generally attributed to synthetic xenobiotics, including estrogenic effects ...
Michal, Bittner, Nadine, Saul, Christian E W, Steinberg   +2 more
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Adsorption of Glyphosate by Humic Substances

Journal of Agricultural and Food Chemistry, 1996
Four humic substances were extracted from a peat (HA1) and a volcanic soil (HA2), an oxidized coal (HA3), and a lignite (HA4). The four humic materials presented distinct differences in their chemical and physical−chemical characteristics as assessed by chemical methods, 13C-NMR spectroscopy, and high-performance size exclusion chromatography.
A. PICCOLO, CELANO, Giuseppe, P. CONTE
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Removal of humic substances by biosorption

Journal of Environmental Sciences, 2008
Fungal pellets of Aspergillus niger 405, Aspergillus ustus 326, and Stachybotrys sp. 1103 were used for the removal of humic substances from aqueous solutions. Batchwise biosorption, carried out at pH 6 and 25 degrees C, was monitored spectrophotometrically and the process described with Freundlich's model.
Vuković Domanovac, Marija, Domanovac, Tomislav, Briški, Felicita   +2 more
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Human lung injury following exposure to humic substances and humic-like substances

Environmental Geochemistry and Health, 2017
Among the myriad particles the human respiratory tract is exposed to, a significant number are distinctive in that they include humic substances (HS) and humic-like substances (HULIS) as organic components. HS are heterogeneous, amorphous, organic materials which are ubiquitous occurring in all terrestrial and aqueous environments.
Andrew J. Ghio, Michael C. Madden
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