Investigations into the mechanism of the photodechlorination of pentachlorobenzene

by Robert Dean Schmidt

Written in English
Published: Pages: 89 Downloads: 410
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Subjects:

  • Chlorobenzene.,
  • Photochemistry.,
  • Radicals (Chemistry)

Edition Notes

Statementby Robert Dean Schmidt.
The Physical Object
Pagination89 leaves, bound :
Number of Pages89
ID Numbers
Open LibraryOL15373141M

There are three dichlorobenzene isomers- 1,2-dichlorobenzene, 1,3-dichlorobenzene, and 1,robenzenes do not occur naturally. 1,2-Dichlorobenzene is a colorless to pale yellow liquid used to make herbicides. 1,3- Dichlorobenzene is a colorless liquid used to make herbicides, insecticides, medicine, and dyes. 1,4-Dichlorobenzene, the most important of the three chemicals.   By Kathleen Doheny. HealthDay Reporter. MONDAY, May 9, (HealthDay News) -- Exposure to pesticides and other chemicals may increase . Hexachlorobenzene (HCB) is a persistent organic pollutant and poses great threat on ecosystem and human health. In order to investigate the degradation law of HCB, a RuO 2 /Ti material was used as the anode, meanwhile, zinc, stainless steel, graphite, and RuO 2 /Ti were used as the cathode, respectively. The gas chromatography (GC) was used to analyze the electrochemical products of HCB on Cited by: 2.   AbstractThe time-dependent density functional theory (TDDFT) method was performed to investigate the excited-state intramolecular double proton transfer (ESIDPT) reaction of calix[4]arene (C4A) and the role of the intramolecular hydrogen bonds in the ESIDPT process. The geometries of C4A in the ground state and excited states (S1, S2 and T1) were : Se Wang, Zhuang Wang, Ce Hao.

1. Environ Sci Pollut Res Int. Jan;21(2) doi: /s Epub Jul Concentration levels and congener profiles of polychlorinated biphenyls, pentachlorobenzene, and hexachlorobenzene in commercial by: Thank You for Visiting Our Website You are exiting the Department of Labor's Web server. The Department of Labor does not endorse, takes no responsibility for, and exercises no control over the linked organization or its views, or contents, nor does it vouch for the accuracy or accessibility of the information contained on the destination server. Question: "Draw A Mechanism For Chlorination Of Methylene Chloride To Produce Chloroform" Is The Overall Problem. I Have The Initiation And 1st Propagation Step Done Already. Now I Need The Propagation Step That Forms Chloroform, Including Lone Pairs In The Drawing. Substance Name — Pentachlorobenzene CASRN — Last Revised — 01/31/ The oral Reference Dose (RfD) is based on the assumption that thresholds exist for certain toxic effects such as cellular necrosis. It is expressed in units of mg/kg-day. In general, the RfD is anFile Size: 97KB.

This article is within the scope of WikiProject Medicine, which recommends that medicine-related articles follow the Manual of Style for medicine-related articles and that biomedical information in any article use high-quality medical visit the project page for details or ask questions at Wikipedia talk:WikiProject Medicine. Start. Pentachlorobenzene ALS Environmental may or may not test for Pentachlorobenzene (CAS # ). Information is subject to change; please contact us for the latest available analytes for which we test. ALS Environmental does not sell chemicals, but offers analytical lab testing to determine the presence of various elements and chemical compounds.   The present study was undertaken to compare the ability of 4 chlorobenzene isomers, DCB, 1,2,4,5-tetrachlorobenzene (TeCB), pentachlorobenzene (PeCB), and HCB to induce the formation of GSTP positive foci in an initiation/promotion medium-term assay, as well as to quantify molecular and biochemical changes that seem to be associated with Cited by: DDT, prepared by the reaction of chloral with chlorobenzene in the presence of sulfuric acid, was first made in ; its insecticidal properties were discovered in by a Swiss chemist, Paul Hermann and after World War II, DDT was found to be effective against lice, fleas, and mosquitoes (the carriers of typhus, of plague, and of malaria and yellow fever, respectively) as.

Investigations into the mechanism of the photodechlorination of pentachlorobenzene by Robert Dean Schmidt Download PDF EPUB FB2

Investigations into the Mechanism of the Photodechlorination of Pentachlorobenzene by Robert Dean Schmidt A THESIS submitted to Oregon State University in partial fulfuliment of the requirements for the degree of Master of Science Completed Commencement June Thepentachlorobenzeneiscontainedinsidethesphericalmicelle,andthe triethylamine is keptoutsidethemicelle where it exerts its electron-donating ability from adistance.

Investigations into the Mechanism of the Photodechlorination of Pentachlorobenzene. INTRODUCTION Photochemical Background. Many polychlorinated aromatic compounds are known to be environmental pollutants.

Perhaps the most notorious of these are the polychlorodibenzodioxins and polychlorobiphenyls (PCB), although there are many other compounds in thisAuthor: Robert Dean Schmidt. Graduation date: Several experiments were undertaken to investigate the mechanism of\ud photodechlorination of pentachlorobenzene.

The thermal methoxydechlorination\ud reaction of pentachlorobenzene was studied. In DMSO at 50 °C sodium\ud methoxide reacts smoothly with pentachlorobenzene to give three\ud tetrachloroanisole isomers.

Several experiments were undertaken to investigate the mechanism of photodechlorination of pentachlorobenzene. The thermal methoxydechlorination reaction of pentachlorobenzene was studied. In DMSO at 50 °C sodium methoxide reacts smoothly with pentachlorobenzene to give three tetrachloroanisole : Robert Dean Schmidt.

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal : Robert Dean. Schmidt. The dissociation of the C−Cl bond is the rate-determining step in the photodechlorination reactions of PCBs when the hydrogen donor is methanol.

The main photodechlorination pathways predicted in this study are in good agreement with previous experimental results. Our results have provided new insights into mechanism of PCBs photodechlorination, Cited by: In order to further understand the photodechlorination mechanisms of PCDEs a theoretical investigation was performed in this study.

The estimated photodechlorination of PCDEs includes two steps as follows: (2) (n) CDE → (n - 1) CDE + Cl (3) (n - 1) CDE + H 2 O → (n - 1) CDE + HOCited by: Investigation of the photochemistry of urea herbicides (chlorotoluron and isoproturon) and quantum yields using polychromatic irradiation.

Environmental Toxicology and Chemistry17 (2), Cited by: In this study, hexachlorobenzene (HCB) was selected as the probe compound for investigation, because its detailed photodechlorination mechanism was well-established previously. A five-step consecutive irreversible model is derived and used in this study to simulate the photodechlorination process in batch and continuous flow by: Quantum chemical calculations studies were performed to investigate the underlying photodehalogenation mechanisms of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and polybrominated dibenzo-p-dioxins and dibenzofurans (PBDD/Fs), as well as Mg 2+ by: 4.

Several experiments were undertaken to investigate the mechanism of photodechlorination of pentachlorobenzene. The thermal methoxydechlorination reaction of pentachlorobenzene. Pentachlorobenzene (PeCB) is a chemical compound with the molecular formula C 6HCl 5 which is a chlorinated aromatic hydrocarbon.

It consists of a benzene ring substituted with five chlorine al formula: C₆HCl₅. Chemosphere, Voi, No, pp/91 $ + Printed in Great Britain Pergamon Press pie ACETONE-INDUCED PHOTODECHLORINATION OF AROCLOR IN ALKALINE 2-PROPANOL: PROBING THE MECHANISM BY THERMOLYSIS IN THE PRESENCE OF Di-t- BUTYL PEROXIDE.

Jalal Hawari,a* Attila Demeter,b by: The investigation was carried out under idealized conditions and has considered both reaction kinetics and the degradation mechanism.

It was found that more than 90% of DBP can be degraded within. Pentachlorobenzene is not produced in Canada and currently there is no domestic commercial demand for this substance.

On the basis of limited data, the 2 most significant sources of entry of pentachlorobenzene into the Canadian environment result from spillage of dielectric fluids and from long-range transport and deposition. Here, we report for the first time a laboratory investigation into the photochemical degradation of 2,2',4,4',6-pentabromodiphenyl ether (BDE) in ice solid samples using an artificial UV light.

The mechanism of photodechlorination of pentachlorobenzene (1) in acetonitrile has been examined. The quantum yield of reaction (Φ r) has been found to vary with the concentration of 1. The concentration levels and congener profiles of polychlorinated biphenyls (PCBs), pentachlorobenzene (PeCBz), and hexachlorobenzene (HxCBz) were assessed in commercially available organic pigments.

Among the azo-type pigments tested, PCB, which is synthesized from 3,3′-dichlorobendizine, and PCB, which is synthesized from 2,2′,5,5′-tetrachlorobendizine, were the Cited by:   In order to determine the biodegradation effects of 12 kinds of dioxin-like PCBs by Anabaena PD-1 cells, cyanobacterial cells in the exponential phase were used.

Four hundred μL dioxin-like PCBs ( mg/L, dissolved in methanol) were added to 20 mL cyanobacterial cultures (OD = Cited by: The proposed structure of the pentachlorobenzene radical anion formed by photolysis in the presence of triethylamine is analogous to the sigma-complex intermediate in the SNAr reaction.

Additionally, analysis of the postreacted materials revealed that a small number of the cubes had become hollow during the photodechlorination reaction. Such findings offer important insights regarding photocatalytic active sites and mechanisms, providing a pathway toward converting light-based energy to chemical energy for sustainable Cited by: 8.

The Quantum Chain Mechanism and the Structure of the Triplet State. The Journal of Physical Chemistry A2,5-Dimethyl-2,4-hexadiene induced photodechlorination of 9,dichloroanthracene.

A Semi-Empirical Investigation into the Trans-Cis Photoisomerisation of by: Application of quantum chemical descriptors into quantitative structure-property relationship models for prediction of the photolysis half-life of PCBs in water.

Frontiers of Environmental Science & Engineering in China5 (4), DOI: /s Molecular Docking Characterizes Substrate-Binding Sites and Efflux Modulation Mechanisms within P-Glycoprotein. Surface Complexes on Carbon Blacks. The Adsorption of NH3, C2H2, C4H10, CH3NH2 and Water Vapor The photodechlorination of pentachlorobenzene.

Investigations utilizing the oxygen isotope shift in carbon nuclear. Pentachlorobenzene is not known to have any commercial uses at present. In the past, pentachlorobenzene was one component of a chlorobenzenes mixture used to reduce the viscosity of PCB /polychlorinated biphenyl/ products employed for heat transfer.

Pentachlorobenzene has also been used in a chlorobenzenes mixture with PCBs in electrical equipment. Purchase Encyclopedia of Toxicology - 3rd Edition. Print Book & E-Book. ISBNGraduate Thesis Or Dissertation Photodechlorination of pentachlorobenzene in organo-clay Public Deposited.

Analytics × Add to Approved for entry into archive by Patricia Black(@) on TZ (GMT) No. of bitstreams: Author: Hye-Dong Yoo. To assist publishers and societies in embracing the advantages offered by an open access publishing model, we have created Phenom - a simple, intuitive, cost-effective publishing solution that supports all workflows; from submission and peer review through to production and publication.

Partner with us. Latest from our journals. Analyses of fish and sediments from the upper course of the river Neckar pointed to a locally restricted discharge of hexachlorobenzene (HCB), octachlorostyrene (OCS) and pentachlorobenzene (PeCB) into the river in the area of the city of Rottweil (see part I of this publication).

The analysis of sludges from sewage producers discharging their effluents into the river Cited by:. Pesticide Biodegradation: Mechanisms, Genetics and Strategies to Enhance the Process. By Ma. Laura Ortiz-Hernández, Enrique Sánchez-Salinas, Edgar Dantán-González and María Luisa Castrejón-Godínez.

Submitted: June 26th Reviewed: February 11th Cited by: Chlorobenzene, a colourless, mobile liquid with a penetrating almondlike odour; it belongs to the family of organic halogen compounds and is used as a solvent and starting material for the manufacture of other organic compounds.

Chlorobenzene was first prepared in by the reaction of phenol.“Mechanistic Investigations Into the Pd/C and Zn+2 Catalyzed Cleavage and Hydrodeoxygenation of Lignin”, I. Klein, Gaining Insights Into the Mechanisms of Fast Pyrolysis of Carbohydrates”, J.C.

Degenstein, P. Murria, M. Easton, “Photodechlorination of 3,3'-Dichlorobenzidine in Water.