Direct VUV photolysis of chlorinated methanes and their mixtures in an oxygen stream using an ozone producing low-pressure mercury vapour lamp.


:The gas-phase photooxidations of CCl(4), CHCl(3), CH(2)Cl(2) and their binary mixtures in an O(2) stream were studied in a flow reactor under various experimental conditions using a low-pressure mercury lamp as light source covered with a high-purity silica sleeve being used. The 184.9 nm VUV irradiation emitted is responsible for the Cl-C bond rupture in the chlorinated methanes and for the formation of O(3) from O(2). The rate of degradation of H-containing chlorinated methanes increased sharply on increase of their initial concentrations, most probably of a (*)Cl chain reaction, as indicated by the increase in the molar ratio of the amount of HCl formed to the amount of H-containing target substance decomposed. The experimental results suggested that the further transformations of the radicals and products formed play an important role as (*)Cl sources, causing a considerably higher rate of decomposition of the H-containing target substances. In a humidified O(2) stream, the (*)OH formed opens up another route for oxidation of the target substances. Thus, the rates of degradation of CH(2)Cl(2) and CHCl(3) increased on increase of the relative humidity, whereas the water vapour had no effect at all on the decomposition of CCl(4). At the same time, competition occurs between (*)Cl or (*)OH for reactions with the target substance. The photooxidation of binary mixtures was investigated too. The addition of CCl(4) or CHCl(3) to CH(2)Cl(2) strongly increased its degradation rate. The addition of CH(2)Cl(2) did not have a considerable effect on the rate of degradation of CHCl(3).






Alapi T,Dombi A




Has Abstract


2007-03-01 00:00:00














  • Biomarker responses at different levels of biological organisation in crabs (Carcinus aestuarii) experimentally exposed to benzo(alpha)pyrene.

    abstract::The aim of this study was to validate a multi-trial biomarker approach for the evaluation of toxicological risk due to benzo(alpha)pyrene. Carcinus aestuarii, exposed to increasing concentrations of B(alpha)P in the water, was used as the bioindicator organism. A set of biomarkers were tested in order to: identify bio...


    pub_type: 杂志文章


    authors: Fossi MC,Casini S,Savelli C,Corbelli C,Franchi E,Mattei N,Sanchez-Hernandez JC,Corsi I,Bamber S,Depledge MH

    更新日期:2000-04-01 00:00:00

  • Impact of dispersant on crude oil content of airborne fine particulate matter emitted from seawater after an oil spill.

    abstract::Inhalation of PM2.5, particles with an aerodynamic diameter <2.5 μm, from sea spray after crude oil spills could present serious health concerns. The addition of dispersants to effectively spread the crude oil throughout the water column has been practiced in recent years. Here, we investigated the possibility of an i...


    pub_type: 杂志文章


    authors: Afshar-Mohajer N,Lam A,Dora L,Katz J,Rule AM,Koehler K

    更新日期:2020-10-01 00:00:00

  • Biotransformation of 17α- and 17β-estradiol in aerobic soils.

    abstract::Considerable research has focused on the fate of 17β-estradiol (17β-E2) given its high estrogenic potency and frequent detection in the environment; however, little is known about the fate behavior of 17α-estradiol (17α-E2) although it often dominates in some animal feces, and recently has been shown to have similar i...


    pub_type: 杂志文章


    authors: Mashtare ML,Green DA,Lee LS

    更新日期:2013-01-01 00:00:00

  • Leaching of veterinary antibiotics in calcareous Chinese croplands.

    abstract::Veterinary antibiotics reach the soil environment by manure application, where they accumulate or are prone to vertical translocation. We assumed that a high pH value at slightly calcareous soil properties should retain tetracyclines and fluoroquinolones even at high manure loads, whereas it should facilitate leaching...


    pub_type: 杂志文章


    authors: Ostermann A,Siemens J,Welp G,Xue Q,Lin X,Liu X,Amelung W

    更新日期:2013-05-01 00:00:00

  • Zinc supplementation can reduce accumulation of cadmium in aged metallothionein transgenic mice.

    abstract::Epidemiologic studies suggest that exposure to Cd is related to a multitude of age-related diseases. There is evidence that Cd toxicity emerges from an interference with Zn metabolism as they compete for the same binding sites of ligands. The most responsive proteins to Cd exposure are the metal-binding proteins terme...


    pub_type: 杂志文章


    authors: Pabis K,Gundacker C,Giacconi R,Basso A,Costarelli L,Piacenza F,Strizzi S,Provinciali M,Malavolta M

    更新日期:2018-11-01 00:00:00

  • Peroxymonosulfate activation by hydroxylamine-drinking water treatment residuals for the degradation of atrazine.

    abstract::Drinking water treatment residuals (WTRs) have been applied in organic pollutants degradation in water by generating reactive oxygen species from peroxymonosulfate (PMS), however, the slow transformation of Fe(III) to Fe(II) may limit its widespread application. Hydroxylamine (HA) was introduced into the system to enh...


    pub_type: 杂志文章


    authors: Zhang H,Liu X,Lin C,Li X,Zhou Z,Fan G,Ma J

    更新日期:2019-06-01 00:00:00

  • Advances on the toxicity of uranium to different organisms.

    abstract::The extensive application of radioactive element uranium (U) and its compounds in the nuclear industry has significantly increased the risk of exposure to the environment. Therefore, research on the safety risks and toxicity mechanisms of U exposure has received increasing attention. This paper reviews the toxic effec...


    pub_type: 杂志文章,评审


    authors: Gao N,Huang Z,Liu H,Hou J,Liu X

    更新日期:2019-12-01 00:00:00

  • Occurrence of organic contaminants in sewage sludges from eleven wastewater treatment plants, China.

    abstract::This study presents the occurrence of 43 semi-volatile organic compounds (SVOCs) listed as priority pollutants by both China and the United States Environmental Protection Agency, in sewage sludges collected from eleven wastewater treatment plants (WWTPs) of mainland and Hong Kong, China. Thirty-six SVOCs were detecte...


    pub_type: 杂志文章


    authors: Cai QY,Mo CH,Wu QT,Zeng QY,Katsoyiannis A

    更新日期:2007-08-01 00:00:00

  • Distribution, sources, and air-soil exchange of OCPs, PCBs and PAHs in urban soils of Nepal.

    abstract::Due to the high temperature and extensive use of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs), tropical cities could act as secondary sources of these pollutants and therefore received global concern. As compared with other tropical cities, studies on t...


    pub_type: 杂志文章


    authors: Pokhrel B,Gong P,Wang X,Chen M,Wang C,Gao S

    更新日期:2018-06-01 00:00:00

  • Biochars impact on water infiltration and water quality through a compacted subsoil layer.

    abstract::Soils in the SE USA Coastal Plain region frequently have a compacted subsoil layer (E horizon), which is a barrier for water infiltration. Four different biochars were evaluated to increase water infiltration through a compacted horizon from a Norfolk soil (fine-loamy, kaolinitic, thermic, Typic Kandiudult). In additi...


    pub_type: 杂志文章


    authors: Novak J,Sigua G,Watts D,Cantrell K,Shumaker P,Szogi A,Johnson MG,Spokas K

    更新日期:2016-01-01 00:00:00

  • Photodegradation of the fungicide thiram in aqueous solutions. Kinetic studies and identification of the photodegradation products by HPLC-MS/MS.

    abstract::In this study, the relevance of photodegradation processes on the persistence of the fungicide thiram in waters was investigated. The photodegradation of thiram in Milli-Q water and in aqueous solutions of humic and fulvic acids, as well as the photodegradation in spiked river water were studied. Both pure thiram and ...


    pub_type: 杂志文章


    authors: Filipe OM,Santos SA,Domingues MR,Vidal MM,Silvestre AJ,Neto CP,Santos EB

    更新日期:2013-05-01 00:00:00

  • Oxidized nanoscale zero-valent iron changed the bioaccumulation and distribution of chromium in zebrafish.

    abstract::Influences of colloidal stabilities of nanoparticles (NPs) on the bioaccumulation of co-existing pollutants remains largely unknown. In this study, two oxidation products of nanoscale zero-valent iron (nZVI) with totally varied colloidal stabilities, termed highly oxidized nZVI (HO-nZVI) and lowly oxidized nZVI (LO-nZ...


    pub_type: 杂志文章


    authors: Jiang D,Hu X,Jin X,Ma A,Yin D

    更新日期:2021-01-01 00:00:00

  • QSAR approach to POPs screening for atmospheric persistence.

    abstract::The environmental behaviour of a persistent organic pollutant (POP) is mainly controlled by its persistence, its tendency to undergo long-range transport (LRT) and its physicochemical properties. Atmospheric half-life is one of the criteria commonly used to study air persistence and LRT potential. For the 12 UNEP POPs...


    pub_type: 杂志文章


    authors: Gramatica P,Consolaro F,Pozzi S

    更新日期:2001-05-01 00:00:00

  • Relevance study of bare and coated zero valent iron nanoparticles for lindane degradation from its by-product monitorization.

    abstract::Zero-valent iron nanoparticles (NZVI) as well as polymer-stabilized nanoparticles were synthesized and used for lindane (γ-hexachlorocyclohexane) degradation in aqueous solution. To study the effectiveness of the different coated nanoparticles, simple and rapid analytical methods have been developed to measure and to ...


    pub_type: 杂志文章


    authors: San Román I,Alonso ML,Bartolomé L,Galdames A,Goiti E,Ocejo M,Moragues M,Alonso RM,Vilas JL

    更新日期:2013-10-01 00:00:00

  • Electrochemical decolourisation of structurally different dyes.

    abstract::The electrochemical decolourisation of structurally different dyes (bromophenol blue, indigo, poly R-478, phenol red, methyl orange, fuchsin, methyl green and crystal violet) by means of the application of DC electric current was assessed. It was found that the electrochemical process allowed a colour removal of all d...


    pub_type: 杂志文章


    authors: Sanromán MA,Pazos M,Ricart MT,Cameselle C

    更新日期:2004-10-01 00:00:00

  • Lactational transfer of mercury and polychlorinated biphenyls in polar bears.

    abstract::We examined concentrations of total mercury (tHg, inorganic and methylated forms) and polychlorinated biphenyls (PCBs) in blood and milk from free-ranging Southern Beaufort-Chukchi Sea polar bears (Ursus maritimus) to assess maternal transfer of contaminants during lactation and the potential health risk to nursing yo...


    pub_type: 杂志文章


    authors: Knott KK,Boyd D,Ylitalo GM,O'Hara TM

    更新日期:2012-07-01 00:00:00

  • Biomonitoring of polycyclic aromatic hydrocarbons exposure in small groups of residents in Brisbane, Australia and Hanoi, Vietnam, and those travelling between the two cities.

    abstract::Exposure to polycyclic aromatic hydrocarbons (PAHs) has been associated with adverse health outcomes. Concentrations of urinary PAH metabolites (OH-PAHs) provide an integrated measure of human exposure to PAHs but measurement of urinary OH-PAHs has not been done in Australia and rarely in Vietnam, where air pollution ...


    pub_type: 杂志文章


    authors: Thai PK,Li Z,Sjödin A,Fox A,Diep NB,Binh TT,Mueller JF

    更新日期:2015-11-01 00:00:00

  • Verification of enzymes deterioration due to Cu(II) presence in an enhanced biological phosphorus removal system.

    abstract::This study experimentally demonstrated that polyphosphate accumulating organisms (PAOs) losing the abilities of anaerobically synthesizing polyhydroxyalkanoates and aerobically taking up phosphate under Cu(II) presence was due to the inhibition of enzyme activities of acetyl-CoA synthases (ACS) and polyphosphate kinas...


    pub_type: 杂志文章


    authors: Tsai YP,Tzeng HF,Lin JW,Lu MS,Lin JY

    更新日期:2013-04-01 00:00:00

  • Photo-assisted degradation of 2, 4, 6-trichlorophenol by an advanced reduction process based on sulfite anion radical: Degradation, dechlorination and mineralization.

    abstract::This research was aimed at evaluating the performance UV only and sulfite-mediated photoreduction process (an advanced reduction process) in the degradation, dechlorination and mineralization of 2, 4, 6-trichlorophenol (TCP). Firstly efficiency of sulfite-mediated photoreduction (SMP) process in the degradation of TCP...


    pub_type: 杂志文章


    authors: Yazdanbakhsh A,Eslami A,Moussavi G,Rafiee M,Sheikhmohammadi A

    更新日期:2018-01-01 00:00:00

  • A comprehensive analysis of metabolomics and transcriptomics reveals new biomarkers and mechanistic insights on DEHP exposures in MCF-7 cells.

    abstract::Di-(2-ethylhexyl) phthalate (DEHP) is one of the most important environmental pollutants and affects multiple pathways upon human exposure. DEHP could induce MCF-7 cell proliferation at a very low dose; however, the possible linkage between DEHP and the cell proliferation effect is still unclear. Here, we carried out ...


    pub_type: 杂志文章


    authors: Lu YS,Yao GX,Wang XL,Liu JX,Yu J,Qiu J,Li Y,Qian YZ,Xu YY

    更新日期:2020-09-01 00:00:00

  • Computational calculation identified optimal binding sites in nano-sized magnetic-cored dendrimer.

    abstract::Magnetic-cored dendrimers (MDs) with amino groups were prepared with the formation of poly(amidoamine) dendrimer on the surface of magnetite nanoparticles (MNPs). The experiment involved the binding of four different heavy metal ions including Pb (II), Cu (II), Zn (II), and Cr (VI). Density functional theory (DFT) cal...


    pub_type: 杂志文章


    authors: Kim HR,Boukhvalov DW,Lee SJ,Park JW

    更新日期:2018-11-01 00:00:00

  • Interactions between organic flocculant PAN-DCD and dyes.

    abstract::Organic flocculant polyacrylonitrile-dicyandiamide (PAN-DCD) was characterized by IR, 1H NMR and 13C NMR spectra. Polar groups, such as triazine, carboxyl, amidine, carbonamide and non-polar groups, such as methylene were identified in the macromolecular chain of PAN-DCD. The flocculant effectively decolorized the exa...


    pub_type: 杂志文章


    authors: Yu Y,Zhuang YY,Zou QM

    更新日期:2001-08-01 00:00:00

  • Photochemical reaction between biphenyl and N(III) in the atmospheric aqueous phase.

    abstract::The photochemical reaction between biphenyl (Bp) and N(III) under irradiation at 365 nm UV light was investigated. The results showed that Bp conversion efficiency was strongly influenced by N (III) concentration, Bp initial concentration and pH. Species-specific rate constants determined by reaction of Bp with H2ONO+...


    pub_type: 杂志文章


    authors: Ma J,Zhu C,Lu J,Wang T,Hu S,Chen T

    更新日期:2017-01-01 00:00:00

  • Biotransformation and antioxidant enzymes of Lumbriculus variegates as biomarkers of contaminated sediment exposure.

    abstract::In this study the black worm Lumbriculus variegatus was tested for suitability as biomonitor for moderately contaminated sediments. The response capacity of the biotransformation system phase II enzyme glutathione-S-transferase (GST) and the oxidative defense enzyme catalase (CAT) to contaminated sediment and atrazine...


    pub_type: 杂志文章


    authors: Contardo-Jara V,Wiegand C

    更新日期:2008-02-01 00:00:00

  • Reduction of the phenolic components in olive-mill wastewater by an enzymatic treatment and its impact on durum wheat (Triticum durum Desf.) germinability.

    abstract::Olive-mill wastewater (OMW), an effluent of olive oil extraction process, is annually produced in huge amounts in olive growing areas. An interesting option for its disposal is the spreading on agricultural land, provided that phytotoxic effects are neutralized. The objective of the present investigation was to evalua...


    pub_type: 杂志文章


    authors: Casa R,D'Annibale A,Pieruccetti F,Stazi SR,Giovannozzi Sermanni G,Lo Cascio B

    更新日期:2003-03-01 00:00:00

  • A scheme to scientifically and accurately assess cadmium pollution of river sediments, through consideration of bioavailability when assessing ecological risk.

    abstract::Evaluating heavy metal pollution status and ecological risk in river sediments is a complex task, requiring consideration of contaminant pollution levels, as well as effects of biological processes within the river system. There are currently no simple or low-cost approaches to heavy metal assessment in river sediment...


    pub_type: 杂志文章


    authors: Song Z,Tang W,Shan B

    更新日期:2017-10-01 00:00:00

  • Evaluation of PCDD/F levels in ambient air and soils and estimation of deposition rates in Kocaeli, Turkey.

    abstract::PCDD/F analyses were made in soil and ambient air samples taken from Kocaeli, an industrialized area of Turkey. Results showed that the levels of PCDD/F pollution are comparable to the levels observed in the various urban areas in the world. PCDD/F concentrations in surface soils ranged between 0.4 and 4.27 pg I-TEQ k...


    pub_type: 杂志文章


    authors: Bakoglu M,Karademir A,Durmusoglu E

    更新日期:2005-06-01 00:00:00

  • Distribution of organochlorine pesticides in sediments from Yangtze River Estuary and the adjacent East China Sea: implication of transport, sources and trends.

    abstract::Thirty-eight surface sediments and two sediment cores were collected from Yangtze River Estuary (YRE) and adjacent East China Sea (ECS) to study the distribution patterns, origins, potential transport and burden of organochlorine pesticides (OCPs) in the marginal sea. Residues of OCPs ranged from 0.190 to 5.17 ng g(-1...


    pub_type: 杂志文章


    authors: Zhou S,Yang H,Zhang A,Li YF,Liu W

    更新日期:2014-11-01 00:00:00

  • Distribution pattern of organotin compounds at different trophic levels of aquatic ecosystems.

    abstract::Organotin compounds including methyl- and butyltin species were determined in selected aquatic specimens (fish muscles, fish liver, mussels, algae) as well as in sediment and water from the mud flats of the German North Sea and the River Elbe. The concentration of tributyltin (TBT) ranged between 27-202 ng/g (fresh ma...


    pub_type: 杂志文章


    authors: Shawky S,Emons H

    更新日期:1998-02-01 00:00:00

  • Development of rearing and testing protocols for a new freshwater sediment test species: the gastropod Valvata piscinalis.

    abstract::This paper aimed at proposing rearing and testing protocols for Valvata piscinalis, a new potential species for sediment toxicity testing. Such tests were developed since this species reliably represents the bio/ecological characteristics of other gastropods. It may thus be representative of their sensitivity to chemi...


    pub_type: 杂志文章


    authors: Ducrot V,Cognat C,Mons R,Mouthon J,Garric J

    更新日期:2006-03-01 00:00:00