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Showing 1 to 9 of 9 for “"humic substance"”.
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Investigating nitrate-dependent humic substance oxidation and in-service K-12 teachers' understanding of microbiology
<p>Humic substances (HS) are the humified portions of totally decomposed soil organic matter that are ubiquitous in nature. Although these substances have been studied for more than 200 years, neither their metabolic capabilities nor a specific chemical structure has yet to be determined. HS have …
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Isolation and physiochemical characterization of dissolved organic matter across limnic and oceanic systems
… international standards from the International Humic Substance Society. Two prepublished works are also included in this dissertation. The first creates an acid-base titration methodology utilizing an autotitrator. The second utilizes this methodology and applies it to newly collected DOM …
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Enhanced degradation of fats, oils and greases in domestic wastewater sewer networks and grease interception systems using peat humic substances
The efficacy of peat humic substances in enhancing the degradation of fats, oils and greases (FOG) was investigated under controlled laboratory conditions using bench scale well-mixed bioreactors. An experimental design was used to evaluate the effects of temperature and peat humic substance (PHS) …
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Measurement and modelling of uranium and thorium in natural waters
… species such as those formed with humic substances are the major species present. A comparison of the pH and level of organic carbon (in a range of natural and synthetic water samples), with the level of uraniumorganic species indicates that the organic carbon concentration is a …
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Hydroxyl radical production via the photo-Fenton reaction in natural waters
… in model systems consisting of a standard humic substance and amorphous iron oxide exposed to simulated sunlight. A probe method was adapted to allow low concentrations of OH' to be measured without otherwise influencing the chemical reactions occurring in experiments. The difference …
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Humic Substances Removal by Activated Carbon
A commercial humic acid and a fulvic acid extracted from peat were used to evaluate the removal of humic substances by various activated carbons. Different analytical methods were investigated to determine humic substances as possible indicators of chloroform formation potential. Total organic …
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The catalytic role of birnessite in the Maillard reaction and the abiotic formation of humic substances
Humic substances are ubiquitous in soils and sediments and because of their agricultural and environmental importance have been the subject of much research. The Maillard (browning) reaction involving the polycondensation of carbohydrates and amino acids has been postulated as being an important …
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Evaluation of reactive cap sorbents for in-situ remediation of contaminated sediments
… study investigated the interferences caused by humic acid on the adsorption of co-planar and non-co-planar polychlorinated biphenyls (PCBs) including 2-chlorobiphenyl, 2, 2', 5, 5'-tetrachlorobiphenyl, 3, 3', 4, 4'-tetrachlorobiphenyl, 2, 2', 4, 4', 5, 5'-hexachlorobiphenyl and 3, 3', 4, 4', 5, …
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Management strategy of landfill leachate and landfill gas condensate
… of interferences were found: one is UV quenching substances, which are bio-refractory and able to penetrate the biological treatment processes, consequently interfere the UV disinfection in WWTPs. The other one is organic nitrogen, which can pass the nitrification-denitrification process and …