Unable to load your collection due to an error, Unable to load your delegates due to an error. One study in two highway tunnels in Chicago reported a concentration of 8.0 g m3 [144]. From our review it appears that OH radicals are formed both in liquid water and in interstellar ices and that these radicals play a considerable role in the degradation of naphthalene. Saborit JMD, Aquilina NJ, Meddings C, Baker S, Vardoulakis S, Harrison RM. 8600 Rockville Pike Accessibility 2020. Naphthalene and its alkyl homologs are the major constituents of creosote. Influence of the support on catalytic activity. Variability in VOC concentrations in an urban area of Delhi. The effect of feed rate on the extent of naphthalene hydrogenation is shown in, Inductive heating (IH) offers thermal advantage over conventional heating (CH), for 70%, The saturation of the aromatic rings enhances ring opening and hydrocracking in which the CC bond cleavage is promoted by the catalyst support [. We anticipate that decreased indoor smoking, improved emission controls on vehicles, and substitution of the naphthalene in moth and other animal repellents and deodorizers has significantly reduced exposures in the U.S. Appl Environ Microbiol. Careers, Unable to load your collection due to an error. Chen SJ, Su HB, Chang JE, Lee WJ, Huang KL, Hsieh LT, Huang YC, Lin WY, Lin CC. Brown SK, Sim MR, Abramson MJ, Gray CN. Forster C, Wandinger U, Wotawa G, James P, Mattis I, Althausen D, Simmonds P, ODoherty S, Jennings SG, Kleefeld C, Schneider J, Trickl T, Kreipl S, Jager H, Stohl A. The standard adsorbent-based methods (TO-17), using either active (pumped) or passive (diffusion) sampling [151], also do not specify naphthalene as a target compound. Lewis AC, Bartle KD, Pilling MJ. sharing sensitive information, make sure youre on a federal These levels are within the ranges discussed for indoor residential concentrations (and much higher than outdoor concentrations), suggesting that personal exposures mainly result from exposures and sources indoors. J Phys Chem Lett. Latest The Dow Chemical Company Patents: Panelized shadow box A high temperature heat transfer fluid is disclosed which comprises a mixture of 1,2,3,4-tetrahydro(1-phenylethyl)naphthalene and an alkyl biphenyl to provide high temperature heat transfer fluids exhibiting favorable thermal stability. The current reference concentration (RfC) of 3 g m3 established by US EPA [17] represents a threshold effects level. We anticipate much higher exposures and risks in countries where these controls are lacking, or where other sources are present. Trace amounts of naphthalene are produced by magnolias and some species of deer, as well as the Formosan subterranean termite, possibly produced by the termite as a repellant against "ants, poisonous fungi and nematode worms. of DeH) Equation (2) based on reaction stoichiometry, as shown in reaction, The X-ray diffraction (XRD) pattern of the NiMo/Al. However, it also appears that upon irradiation of naphthalene in liquid water, hydrogen peroxide, a species that accelerates naphthalene degradation, is formed. 2002;82:1-556 Appl Environ Microbiol. Available online: Scottish EPA Scottish Pollutant Release Inventory (SPRI). Accessibility "Hydrogenation and Dehydrogenation of Tetralin and Naphthalene to Explore Heavy Oil Upgrading Using NiMo/Al2O3 and CoMo/Al2O3 Catalysts Heated with Steel Balls via Induction" Catalysts 10, no. Reaction of 2-amino-4,5,6,7-tetrahydro-1-benzoselenophene-3-carbonitrile with ethylenediamine in the presence of a catalytic amount of carbon disulfide afforded 2-amino-3-(4,5-dihydro-1H-imidazol-2-yl)-4,5,6,7-tetrahydro-1-benzoselenophene. Cheng L, Fu L, Angle RP, Sandhu HS. In Western Europe the well-known producers are Koppers, Ruetgers, and Deza. Additionally, naphthalene is of environmental interest, because of its chronic and acute effects on living systems, such as humans and animals (e.g. The 5,6,7,8-Tetrahydro-2-Naphthoyl-Coenzyme A Reductase Reaction in the Anaerobic Degradation of Naphthalene and Identification of Downstream Metabolites. 5: 497. McCarthy MC, Hafner HR, Chinkin LR, Charrier JG. Naphthalene is an organic compound with formula C10H8. Transport of boreal forest fire emissions from Canada to Europe. Both U.S. EPA [18] and IARC [14] judge that epidemiological data are inadequate for determining human carcinogenicity. International Journal of Environmental Research and Public Health, http://creativecommons.org/licenses/by/3.0/, Int J Environ Res Public Health. For example, chlorination and bromination of naphthalene proceeds without a catalyst to give 1-chloronaphthalene and 1-bromonaphthalene, respectively. International Conderence on Indoor Air Quality Problems and Engineering Solutions; Research Triangle Park, NC, USA. Volatile organic compounds in indoor environment and photocatalytic oxidation: State of the art. Otherwise as Table 4. Characterization of ambient volatile organic compounds at a landfill site in Guangzhou, South China. Description SDS . Price PS, Jayjock MA. A high temperature heat transfer fluid is disclosed which comprises a mixture of 1,2,3,4-tetrahydro(1-phenylethyl)naphthalene and an alkyl biphenyl to provide high temperature heat transfer fluids exhibiting favorable thermal stability. For indoor settings, the available studies are suggestive but inconsistent with respect to the influence of potential naphthalene sources, such as moth repellents, air fresheners, and deodorizers. Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. Federal government websites often end in .gov or .mil. You are accessing a machine-readable page. J Phys Chem A. Hidalgo KJ, Sierra-Garcia IN, Dellagnezze BM, de Oliveira VM. Two aromatic rings joined are known as naphthalene. Heavy-Oil Recovery from Thin Pay Zones by Electromagnetic Heating. Rural areas may experience occasional elevated concentrations due to open biomass burning. The kinetic data from the fixed-bed inductive heated catalytic with steel balls were evaluated with a first-order reaction rate on the assumption of plug flow. This method was not recommended for naphthalene due to low recovery efficiency, low storage capability [156] and high breakthrough [156,157]. 2005 Feb 15;39(4):1101-10. doi: 10.1021/es048855p. eCollection 2020. ; Leeke, G.A. While several studies used a large number of measurements, no long-term trends were discerned, and this was not investigated in any of the studies. Collins MJ, Williams PL, McIntosh DL. Li L, Lai C, Huang F, Cheng M, Zeng G, Huang D, Li B, Liu S, Zhang M, Qin L, Li M, He J, Zhang Y, Chen L. Water Res. Atkinson R, Arey J. Atmospheric chemistry of gas-phase polycyclic aromatic-hydrocarbonsformation of atmospheric mutagens. Damoah R, Spichtinger N, Forster C, James P, Mattis I, Wandinger U, Beirle S, Wagner T, Stohl A. Factors affecting indoor concentrations, including the causes of the highest levels, are not well understood, and populations at risk of high of exposure presently cannot be identified. J Air Waste Manag Assoc. Showing 1-30 of 45 results for "tetrahydro-naphthalene" within Products. ; Khan, A.A. Flow regime identification and pressure drop in cocurrent gas-liquid upflow through packed beds. Edwards et al. Chung CW, Morandi MT, Stock TH, Afshar M. Evaluation of a passive sampler for volatile organic compounds at ppb concentrations, varying temperatures, and humidities with 24-h exposures. In many cases it is more efficient than other high-boiling solvents, such as dichlorobenzene, benzonitrile, nitrobenzene and durene. The International Agency for Research on Cancer (IARC)[37] classifies naphthalene as possibly carcinogenic to humans and animals (Group 2B). Genome sequence of the deltaproteobacterial strain NaphS2 and analysis of differential gene expression during anaerobic growth on naphthalene. This seems reasonable given that individuals spend minimal amounts of time in a closet or bathroom where mothballs, deodorizers and air fresheners might be used, while monitoring in nearby rooms might end up with high concentrations, and since individuals are outdoors or in other environments where levels are low. sulfuric acid results in the formation of ring structure of -tetralene by the ellimination of water molecule. Characterization of polycyclic aromatic hydrocarbons in motor vehicle fuels and exhaust emissions. FOIA The rate of naphthalene hydrogenation is higher than that of tetralin. Hence, using naphthalene and tetralin will help elucidate their individual performance. The electrochemical reduction of 4- (5',6',7',8'-tetrahydro-naphthalene)-1-tetralone was investigated in aprotic solvent dimethylsulphoxide at glassy carbon electrode (GCE) using the technique of. 2008 Jul 7;129(1):014709 Some naphthalenesulfonate polymers are superplasticizers used for the production of high strength concrete. 2004 Jul 1;49(1):27-36. doi: 10.1016/j.femsec.2004.02.019. Polycyclic aromatic hydrocarbons in the indoor and outdoor air of three cities in the US. The GC oven temperature was set at 120 C for 3 min and then ramped to 200 C at 10 C/min and held at 200 C for 4 min. Degradation of naphthalene with magnetic bio-char activate hydrogen peroxide: Synergism of bio-char and Fe-Mn binary oxides. Most measurements fall below the current U.S. EPA reference concentration of 3 g m3 established for non-cancer effects, although measurements in several homes show concentrations approaching or exceeding 100 g m3. Unlike benzene, the carboncarbon bonds in naphthalene are not of the same length. LOTUS - the natural products occurrence database 1 Structures 1.1 2D Structure Structure Search Get Image Download Coordinates Chemical Structure Depiction PubChem 1.2 3D Conformer PubChem 2 Names and Identifiers Outdoor concentrations form a floor for indoor concentrations, i.e., they represent the level in residences that do not contain naphthalene-containing products. ; Hansen, M.F. Where required, crude naphthalene can be further purified by recrystallization from any of a variety of solvents, resulting in 99% naphthalene by weight, referred to as 80C (melting point).[25]. Bookshelf The naphthalene gradient due to traffic-related emissions has not been characterized. Therefore, the liberation of hydrogen gas and hydrogen-rich gases (i.e., methane and ethane) during the upgrading is detrimental to the quality of the upgraded oil as well as the catalyst due to coking [, The schematic diagram of the lab-scale inductive heated catalytic reactor is shown in, A hydrogen flow of 200 mL/min was used, and the catalyst was reduced under hydrogen atmosphere for 30 min at 250 C at 5 bar, which converts the respective metal oxides of Mo, Ni, and Co into their active metal phase. the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, Acidic conditions enhanced their catalytic activity, whereas basic conditions suppressed it. You seem to have javascript disabled. Personal exposure to naphthalene have been reported in only three European studies (Table 6). Batterman S, Jia CR, Hatzivasilis G. Migration of volatile organic compounds from attached garages to residences: A major exposure source. Available online: US EPA National Emissions Inventory (NEI). Srivastava A. the contents by NLM or the National Institutes of Health. We thank Huda Elasaad, Patrick Goegen, Margaret Yoke, O. Burgan, and Patrick Denning for their assistance and review. The true cancer risk due to naphthalene exposure remains controversial. Current external and internal exposure to naphthalene of workers occupationally exposed to polycyclic aromatic hydrocarbons in different industries. While used, the method has been only partially validated [152]. Long-range atmospheric transport and local pollution sources on PAH concentrations in a South European urban area. Using charcoal as base material reduces mosquito coil emissions of toxins. Nazaroff WW, Singer BC. Gas-phase organics in environmental tobacco smoke. How Much Crude Oil Has the World Really Consumed? Environ Health Perspect. Hart, A.; Adam, M.; Robinson, J.P.; Rigby, S.P. moths). None of the studies reviewed had much if any discussion of data quality issues, e.g., blank contamination, reproducibility and detection limits. This is because of the deposition of strongly adsorbed condense arenes naphthalene and other polymerization reactions due to the presence of olefins and aromatic compounds. 3. Unsurprisingly, outdoor concentrations are lower in rural areas that have little traffic and fewer if any industrial facilities (Table 5). Traffic. Novel MoP/HY catalyst for the selective conversion of naphthalene to tetralin. 2019 Sep 1;160:238-248. doi: 10.1016/j.watres.2019.05.081. Report on Carcinogens - Naphthalene, Eleventh Edition. White DH, Hardy JW. The partial list of naphthalene derivatives includes the following compounds: Language links are at the top of the page across from the title. 2020;251:25-108. doi: 10.1007/398_2019_29. Almost all the synthesized compounds at the 10(-3) M concentrations showed superoxide anion . Sanderson EG, Farant JP. Such events are sporadic but may result in air pollution episodes with unfavorable meteorology [142,143]. ; Boldor, D. Ex-situ up-conversion of biomass pyrolysis bio-oil vapors using Pt/Al. In Sarnia, Canada, a clear concentration gradient was seen around a large cluster of industrial and chemical facilities [133]. Housing characteristics and indoor concentrations of selected volatile organic compounds (VOCs) in Quebec City, Canada. MeSH Before Charles SM, Batterman SA, Jia CR. With alkali metals, naphthalene forms the dark blue-green radical anion salts such as sodium naphthalene, Na+C10H8. [0056] In order to test the thermal degradation of low pressure heat transfer fluids, the following fluids were degraded at 675 F., for 500 hrs: 1,2,3,4-tetrahydro(1-phenylethyl)naphthalene(ST-THN), partially hydrogenated terphenyl, dibenzyltoluene, and a 50/50 blend of 1,2,3,4-tetrahydro(1-phenylethyl)-naphthalene) and diisopropylbiphenyl .
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