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Showing 1 to 16 of 16 for “"nitrosamines"”.
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Determination of volatile nitrosamines in foods and other environmental samples
… were investigated for determination of volatile nitrosamines which have been reported to occur in foods and other environmental samples. Nitrosamines were removed from foods using a Likens-Nickerson extractor; 81% of added dimethylnitrosamine and 110% of added diethylnitrosamine were recovered …
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Bismuth Tungstate Photocatalysis for N-Nitrosamines Removal from Amine Washing Wastewater
… marine life. Amine degradation products like N-nitrosamines are carcinogenic and mutagenic. The formation of carcinogenic and mutagenic N-nitrosamines can obstruct the technology's industrial application. To reduce the impact on human health and marine life, identifying and treating …
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Leveraging the Photochemistry of N-Nitrosamines for Their Aqueous Detection, and Development of a Novel Hemi-Iptycene for Porous Polymers
N-Nitrosamines are a class of compounds known for both the potent carcinogenicity of many of its members, and for their widespread occurrence in the human environment. Consequently, the development of methods for their detection is an active area of research. Chapter 1 provides an introduction to …
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Determination of Organic Compounds by Atomic Absorption Spectrophotometry (AAS) with Special Reference to Compounds Encountered in Environmental Problems
… was the possible determination of certain N-nitrosamines. These are carcinogenic substances formed by the interaction of organic secondary amines with nitrite salts. In the present work, the spectrophotometric determination of saccharin by selective solvent extraction from aqueous solutions …
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Total N-nitrosamine Precursor Adsorption with Carbon Nanotubes: Elucidating Controlling Physiochemical Properties and Developing a Size-Resolved Precursor Surrogate
… (THMs), dihaloacetonitriles (DHANs), and N-nitrosamines – during water treatment may also increase. N-nitrosamines may comprise the bulk of the chronic toxicity in treated drinking waters despite forming at low ng/L levels. This research seeks to elucidate physicochemical properties of …
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Activated carbon catalyzed nitrosamine formation via amine nitrosation
Nitrosamines have garnered increasing attention from researchers and policy makers in recent years due to potential human health implications associated with their unintentional formation in water and wastewater treatment facilities. This work addresses a crucial nitrosamine formation pathway …
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Occurrence, monitoring and removal of drinking water contaminants by advanced technologies
… has been linked N-nitrosamine formation. N-nitrosamines are a group of nitrogenous DBPs (N-DBPs) which are highly carcinogenic in comparison to regulated DBPs (THMs and HAAs, generated by FC disinfection). Also in the forefront of drinking water concerns are other emerging drinking water …
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Chemical exposures in drinking water: contaminant analysis and physicochemical behavior
… contaminants (i.e., probable carcinogens, N-nitrosamines), improving method sensitivity and critically identifying false-positive interferences. Finally, methods were evaluated and deployed for the determination of physicochemical properties of N-nitrosamines. The results of which demonstrate …
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Chemical Sensing of N-Nitrosodimethylamine and Methane
… on a luminescent method to determine levels of N-nitrosamines is presented. This work involved the synthesis of five phosphines bearing N-heterocycles, followed by coordination with Cu(I) to give luminescent complexes. Emission spectra spanned the visible range, demonstrating the tuneability of …
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Environmental considerations for interactions between agricultural herbicides and nitrogen fertilizers in water
… Another potential result is the formation of nitrosamines. Nitrosamines, which can be carcinogenic, mutagenic, and teratogenic, are a product of xenobiotic reactions and pose an equal or greater risk to the environment and human health than the parent compounds. The combination of nitrosatable …
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Drinking water disinfection by-products detection, formation and the precursors removal study
… precursors are present, highly toxic N-nitrosamines may form during water treatment process. In the third part of this dissertation, zeolites and activated carbon were examined for ammonia and N-nitrosamine precursors removal when incorporated into drinking water treatment …
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Exposure, telomere length, and cancer risk
… exposures and telomere length were found: N-nitrosamines were related to shorter telomeres, whereas welding fumes and diesel exhaust showed no significant impact on telomere length. Arsenic in drinking water was related to longer telomeres and the association between arsenic and telomere …
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Autoradiographische Untersuchungen zur Toxikokinetik von Myosmin in Ratten
… such as nicotine, cotinine and tobacco-specific nitrosamines. Direct determina-tion of radioactivity in the excised glands confirmed the result obtained by quantitative autoradiography. After extraction of the slices most of the radioactivity was removed from the tissues. An increased proportion …
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Removal of Organic Micro-Pollutants from Water Using Sewage Sludge Based Composite Adsorbents
… based adsorbents were also able to remove 6 nitrosamines from water under batch equilibrium and dynamic flow through conditions. The adsorption capacities determined from batch experiments ranged from 4.3 to 17 mg/g, comparable to those of many other materials such as modified zeolite, …
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In vitro toxicology of complex mixtures from drinking water disinfection and amine-based carbon capture systems
In nature, exposure to chemical insults and toxic agents never occurs in isolation. Any number of concurrent exposures can result from environmental factors. The complex network of integrated organ systems and metabolic pathways are altered by the presence of different agents, so it is possible …