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Inorganic Selenium and Tellurium Speciation in Aqueous Medium of Biological Samples
1 INORGANIC SELENIUM AND TELLURIUM SPECIATION IN AQUEOUS MEDIUM OF BIOLOGICAL SAMPLES ________________________ A Thesis Presented to The Faculty of the Department of Chemistry Sam Houston State University ________________________ In Partial fulfillment Of the Requirements for the Degree of Master of Science ________________________ by Rukma S. T. Basnayake December, 2001 2 INORGANIC SELENIUM AND TELLURIUM SPECIATION IN AQUEOUS MEDIUM OF BIOLOGICAL SAMPLES by Rukma S.T. Basnayake _______________________________ APPROVED: ________________________________ Thomas G. Chasteen, Thesis Director ________________________________ Paul A. Loeffler ________________________________ Benny E. Arney Jr. APPROVED: _____________________________ Dr. Brian Chapman, Dean College of Arts and Sciences 3 ABSTRACT Basnayake, Rukma ST, Inorganic Selenium and Tellurium Speciation in Aqueous Medium of Biological Samples, Master of Science (Chemistry), December 2001, Sam Houston State University, Huntsville, Texas, 60 pp. Purpose The purpose of this research was to develop methods to study the ability of bacteria, Pseudomonas fluorescens K27 to detoxify tellurium and selenium salts by biotransformation processes under anaerobic conditions. Another purpose was to make an effort to separate biologically produced Se0 from cells. Methods Pseudomonas fluorescens K27 was grown in TSN3 medium (tryptic soy broth with 0.3% nitrate) under anaerobic conditions and the production of elemental tellurium and elemental selenium was observed when amended with inorganic tellurium salts and selenium salts, respectively. The amount of soluble tellurium species in the culture medium also was determined. Samples from a 2.75 L bioreactor were taken after cultures had reached the stationary growth phase and were centrifuged in order to separate insoluble species (elemental tellurium, elemental selenium) from soluble species (oxyanions of tellurium, oxyanions of selenium). -
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Preparation of Telluric Acid from Tellurium Dioxide by Oxidation with Potassium Permanganate Frank C. Mathers, Charles M. Rice, Howard Broderick, and Robert Forney, Indiana University General Statement Tellurium dioxide, Te0 2 , although periodically similar to sulfur dioxide, cannot be oxidized by nitric acid to the valence of six, i.e., to telluric acid, H 2 Te04.2H 2 0. Among the many stronger oxidizing agents that will produce this oxidation, potassium permanganate in a nitric acid solution is quite satisfactory. This paper gives directions and data for the preparation of telluric acid by this reaction. The making of telluric acid is a desirable laboratory experiment because (1) tellurim dioxide is available in large quantities and is easily obtained, (2) the telluric acid is a stable compound, easily purified, easily crystallized, and non-corrosive, and (3) students are interested in experimenting with the rarer elements. The small soluibility of telluric acid and the high solubility of both manganese and potassium nitrates in nitric acidi gives a sufficient differ- ence in properties for successful purification by crystallization of the telluric acid. Methods of Analyses Tellurium dioxide can be volumetrically 2 titrated in a sulfuric acid solution by an excess of standard potassium permanganate, followed by enough standard oxalic acid to decolorize the excess of permanganate. The excess of oxalic acid must then be titrated by more of the perman- ganate. The telluric acid can be titrated, like any ordinary monobasic acid, 3 (1911). with standard sodium hydroxide using phenolphthalein as an indicator, if an equal volume of glycerine is added. If any nitric acid is present, it must be neutralized first with sodium hydroxide, using methyl orange as indicator. -
Calarp) Program
California Accidental Release Prevention (CalARP) Program Administering Agency Guidance January 31, 2005 Preface This document provides general guidance to help Administering Agencies (AAs) implement and enforce the California Accidental Release Prevention (CalARP) Program. The intent is to identify the elements of the Program applicable to each regulated business, and assist AAs with oversight of the CalARP Program statutes and regulations. This document is not a substitute for the CalARP Program regulations; it does not impose legally binding requirements. About This Document This document follows the format of the California Code of Regulations, Title 19, Division 2, Chapter 4.5: California Accidental Release Prevention (CalARP) Program. The regulatory sections are presented in parentheses for ease of reference. Acknowledgements The California Emergency Management Agency (Cal EMA) would like to thank the following people for their valuable assistance in the preparation of this document: Howard Wines, Hazardous Materials Specialist, City of Bakersfield Fire Department Robert Distaso P.E., Fire Safety Engineer, Orange County Fire Authority Randall L. Sawyer, Supervisor, Accidental Release Prevention Programs, Contra Costa County Health Services Department Beronia Beniamine, Senior Hazardous Materials Specialist, Stanislaus County Environmental Resources Department Angie Proboszcz, Risk Management Program Coordinator, USEPA Region 9 Jon Christenson, Senior Environmental Health Specialist, Merced County Department of Public Health Teresa -
Studies in Microencapsula Tion of Rodenticides
STUDIES IN MICROENCAPSULA TION OF RODENTICIDES P. B. CORNWEL,.L, Director of Research, Rentokil Laboratories ltd., Felcourt, E. Grinstead, Sussex, England ABSTRACT: Warfarln, zinc phosphide, norbormlde and alphachloralose have been mlcroencapsu lated by the technique of coacervatlon and fed to laboratory rats (R. norveglcus) and mice (H. mU$CUlus). Results are given of experiments In which the concentration of rodentlclde, wall material and phase ratio have been varied separately and in combination. Experiments are also repot'ted In which normal and encapsulated rodentlclde have been fed together In the same test diet. Hlcroencapsulatlon can Increase the Intake of rodentlcldes, appreciably, whether or not alternative food is simultaneously available. Nevertheless, significantly higher kills from higher Intakes of poison have not been achieved, Indicating difficulties In optimising the characteristics of the capsule wall to achieve the desired release of Ingested active In gredient. INTl\ODUCTION Hlcroencapsulatlon can be defined as a chemical process by which minute amounts of solids or liquids are enclosed within a thin wall of suitable material to prevent their reaction with some component of the environment. The properties of the wall are so designed to keep the reactive materials apart until they are required to mix. Hlcroencapsulatlon, as an Industrial process, has been developed for many applications by the Natlon~l Cash Register Co. These Include carbonless copying paper, drugs with design ed release characteristics, as well as uses In the perfumery, adhesive and food Industries (Gordon, 1965) . The costs vary from 40 U.S. cents to $4 per kg. of encapsulated material (Watson, 1970) and many future applications have been proposed. -
Studies in Microencapsulation of Rodenticides
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by DigitalCommons@University of Nebraska University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Proceedings of the 4th Vertebrate Pest Vertebrate Pest Conference Proceedings Conference (1970) collection March 1970 STUDIES IN MICROENCAPSULATION OF RODENTICIDES P. B. Cornwell Rentokil Laboratories Ltd., Sussex, England Follow this and additional works at: https://digitalcommons.unl.edu/vpcfour Part of the Environmental Health and Protection Commons Cornwell, P. B., "STUDIES IN MICROENCAPSULATION OF RODENTICIDES" (1970). Proceedings of the 4th Vertebrate Pest Conference (1970). 18. https://digitalcommons.unl.edu/vpcfour/18 This Article is brought to you for free and open access by the Vertebrate Pest Conference Proceedings collection at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Proceedings of the 4th Vertebrate Pest Conference (1970) by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. STUDIES IN MICROENCAPSULATION OF RODENTICIDES P. B. CORNWELL, Director of Research, Rentokil Laboratories Ltd., Felcourt, E. Grinstead, Sussex, England ABSTRACT: Warfarin, zinc phosphide, norbormide and alphachloralose have been microencapsulated by the technique of coacervation and fed to laboratory rats (R. norvegicus) and mice (M. musculus). Results are given of experiments in which the concentration of rodenticide, wall material and phase ratio have been varied separately and in combination. Experiments are also reported in which normal and encapsulated rodenticide has been fed together in the same test diet. Microencapsulation can increase the intake of rodenticides, appreciably, whether or not alternative food is simultaneously available. Nevertheless, significantly higher k i l l s from higher intakes of poison have not been achieved, indicating difficulties in optimising the characteristics of the capsule wall to achieve the desired release of ingested active in- gredient. -
Developing a Method for Determining the Mass Balance of Selenium and Tellurium Bioprocessed by a Selenium-Resistant Bacterium Grown in The
Developing a Method for Determining the Mass Balance of Selenium and Tellurium Bioprocessed by a Selenium-Resistant Bacterium Grown in the Presence of Selenite or Tellurite __________________ A Thesis Presented to The Faculty of the Department of Chemistry Sam Houston State University ____________________ In Partial Fulfillment Of the Requirements for the Degree of Master of Science ____________________ by Janet Horton Bius December, 2001 Developing a Method for Determining the Mass Balance of Selenium and Tellurium Bioprocessed by a Selenium-Resistant Bacterium Grown in the Presence of Selenite or Tellurite by Janet Horton Bius ____________________ Approved: _____________________________ Thomas G. Chasteen ____________________________ Mary F. Plishker ____________________________ Rick C. White Approved: ____________________________ Brian Chapman, Dean College of Arts and Sciences II ABSTRACT Bius, Janet Horton, Developing a Method for Determining the Mass Balance of Selenium and Tellurium Bioprocessed by a Selenium-Resistant Bacterium Grown in the Presence of Selenite or Tellurite, Master of Science (Chemistry), December, 2001. Sam Houston State University, Hunts- ville, Texas, 68 pp. Purpose The purpose of this investigation was to determine: (1) the mass balance of selenium or tellurium that was bioreduced when a selenium-resistant facultative anaerobe was amended with either selenium or tellurium; and (2) methods to analyze for these metalloids in biological samples. Methods Analytical methods were developed for the determination of -
The Enthalpy of Formation of Organic Compounds with “Chemical Accuracy”
chemengineering Article Group Contribution Revisited: The Enthalpy of Formation of Organic Compounds with “Chemical Accuracy” Robert J. Meier Pro-Deo Consultant, 52525 Heinsberg, North-Rhine Westphalia, Germany; [email protected] Abstract: Group contribution (GC) methods to predict thermochemical properties are of eminent importance to process design. Compared to previous works, we present an improved group contri- bution parametrization for the heat of formation of organic molecules exhibiting chemical accuracy, i.e., a maximum 1 kcal/mol (4.2 kJ/mol) difference between the experiment and model, while, at the same time, minimizing the number of parameters. The latter is extremely important as too many parameters lead to overfitting and, therewith, to more or less serious incorrect predictions for molecules that were not within the data set used for parametrization. Moreover, it was found to be important to explicitly account for common chemical knowledge, e.g., geminal effects or ring strain. The group-related parameters were determined step-wise: first, alkanes only, and then only one additional group in the next class of molecules. This ensures unique and optimal parameter values for each chemical group. All data will be made available, enabling other researchers to extend the set to other classes of molecules. Keywords: enthalpy of formation; thermodynamics; molecular modeling; group contribution method; quantum mechanical method; chemical accuracy; process design Citation: Meier, R.J. Group Contribution Revisited: The Enthalpy of Formation of Organic Compounds with “Chemical Accuracy”. 1. Introduction ChemEngineering 2021, 5, 24. To understand chemical reactivity and/or chemical equilibria, knowledge of thermo- o https://doi.org/10.3390/ dynamic properties such as gas-phase standard enthalpy of formation DfH gas is a necessity. -
Assessing the Sustainability of Anticoagulant-Based Rodent Control for Wildlife Conservation in New Zealand
Copyright is owned by the Author of the thesis. Permission is given for a copy to be downloaded by an individual for the purpose of research and private study only. The thesis may not be reproduced elsewhere without the permission of the Author. Assessing the sustainability of anticoagulant-based rodent control for wildlife conservation in New Zealand A thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Conservation Biology at Massey University, Palmerston North, New Zealand SUMAN PREET KAUR SRAN 2019 1 I dedicate this thesis to My Grandmother, Baljinder Kaur Sran who has loved and supported me unconditionally 2 Table of Contents Acknowledgements ....................................................................................................................... 7 Abstract ......................................................................................................................................... 9 Glossary of Key Terms related to Anticoagulant Resistance ...................................................... 11 CHAPTER 1 Introduction ............................................................................................................. 13 Rodents in New Zealand ......................................................................................................... 14 Rattus rattus ........................................................................................................................... 14 Mus musculus ......................................................................................................................... -
The List of Extremely Hazardous Substances)
APPENDIX A (THE LIST OF EXTREMELY HAZARDOUS SUBSTANCES) THRESHOLD REPORTABLE INVENTORY RELEASE QUANTITY QUANTITY CAS NUMBER CHEMICAL NAME (POUNDS) (POUNDS) 75-86-5 ACETONE CYANOHYDRIN 500 10 1752-30-3 ACETONE THIOSEMICARBAZIDE 500/500 1,000 107-02-8 ACROLEIN 500 1 79-06-1 ACRYLAMIDE 500/500 5,000 107-13-1 ACRYLONITRILE 500 100 814-68-6 ACRYLYL CHLORIDE 100 100 111-69-3 ADIPONITRILE 500 1,000 116-06-3 ALDICARB 100/500 1 309-00-2 ALDRIN 500/500 1 107-18-6 ALLYL ALCOHOL 500 100 107-11-9 ALLYLAMINE 500 500 20859-73-8 ALUMINUM PHOSPHIDE 500 100 54-62-6 AMINOPTERIN 500/500 500 78-53-5 AMITON 500 500 3734-97-2 AMITON OXALATE 100/500 100 7664-41-7 AMMONIA 500 100 300-62-9 AMPHETAMINE 500 1,000 62-53-3 ANILINE 500 5,000 88-05-1 ANILINE,2,4,6-TRIMETHYL- 500 500 7783-70-2 ANTIMONY PENTAFLUORIDE 500 500 1397-94-0 ANTIMYCIN A 500/500 1,000 86-88-4 ANTU 500/500 100 1303-28-2 ARSENIC PENTOXIDE 100/500 1 THRESHOLD REPORTABLE INVENTORY RELEASE QUANTITY QUANTITY CAS NUMBER CHEMICAL NAME (POUNDS) (POUNDS) 1327-53-3 ARSENOUS OXIDE 100/500 1 7784-34-1 ARSENOUS TRICHLORIDE 500 1 7784-42-1 ARSINE 100 100 2642-71-9 AZINPHOS-ETHYL 100/500 100 86-50-0 AZINPHOS-METHYL 10/500 1 98-87-3 BENZAL CHLORIDE 500 5,000 98-16-8 BENZENAMINE, 3-(TRIFLUOROMETHYL)- 500 500 100-14-1 BENZENE, 1-(CHLOROMETHYL)-4-NITRO- 500/500 500 98-05-5 BENZENEARSONIC ACID 10/500 10 3615-21-2 BENZIMIDAZOLE, 4,5-DICHLORO-2-(TRI- 500/500 500 FLUOROMETHYL)- 98-07-7 BENZOTRICHLORIDE 100 10 100-44-7 BENZYL CHLORIDE 500 100 140-29-4 BENZYL CYANIDE 500 500 15271-41-7 BICYCLO[2.2.1]HEPTANE-2-CARBONITRILE,5- -
RRAC Guidelines on Anticoagulant Rodenticide Resistance Management Editor: Rodenticide Resistance Action Committee (RRAC) of Croplife International Aim
RRAC guidelines on Anticoagulant Rodenticide Resistance Management Editor: Rodenticide Resistance Action Committee (RRAC) of CropLife International Aim This document provides guidance to advisors, national authorities, professionals, practitioners and others on the nature of anticoagulant resistance in rodents, the identification of anticoagulant resistance, strategies for rodenticide application that will avoid the development of resistance and the management of resistance where it occurs. The Rodenticide Resistance Action Committee (RRAC) is a working group within the framework of CropLife International. Participating companies include: Bayer CropScience, BASF, LiphaTech S. A., PelGar, Rentokil Initial, Syngenta and Zapi. Senior technical specialists, with specific expertise in rodenticides, represent their companies on this committee. The RRAC is grateful to the following co-authors: Stefan Endepols, Alan Buckle, Charlie Eason, Hans-Joachim Pelz, Adrian Meyer, Philippe Berny, Kristof Baert and Colin Prescott. Photos provided by Stefan Endepols. Contents 1. Introduction ............................................................................................................................................................................................................. 2 2. Classification and history of rodenticide compounds ..............................................................................................3 3. Mode of action of anticoagulant rodenticides, resistance mechanisms, and resistance mutations ......................................................................................................6 -
Supporting Information
Photocatalytic Atom Transfer Radical Addition to Olefins utilizing Novel Photocatalysts Errika Voutyritsa, Ierasia Triandafillidi, Nikolaos V. Tzouras, Nikolaos F. Nikitas, Eleftherios K. Pefkianakis, Georgios C. Vougioukalakis* and Christoforos G. Kokotos* Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15771, Greece SUPPORTING INFORMATION Page General Remarks S2 Optimization of the Reaction Conditions for the Photocatalytic Reaction S3 between 1-decene and BrCH2CN Synthesis of Photocatalysts S5 Synthesis of the Starting Materials S12 General Procedure for the Photocatalytic Reaction between Olefins and S18 BrCH2CN General Procedure for the Photocatalytic Reaction between Olefins and S29 BrCCl3 Determination of the Quantum Yield S33 Phosphorescence Quenching Studies S36 References S41 NMR Spectra S43 E. Voutyritsa, I. Triandafillidi, N. V. Tzouras, N. F. Nikitas, E. K. Pefkianakis, G. C. Vougioukalakis & C. G. Kokotos S1 General Remarks Chromatographic purification of products was accomplished using forced-flow ® chromatography on Merck Kieselgel 60 F254 230-400 mesh. Thin-layer chromatography (TLC) was performed on aluminum backed silica plates (0.2 mm, 60 F254). Visualization of the developed chromatogram was performed by fluorescence quenching, using phosphomolybdic acid, anisaldehyde or potassium permanganate stains. Mass spectra (ESI) were recorded on a Finningan® Surveyor MSQ LC-MS spectrometer. HRMS spectra were recorded on Bruker® Maxis Impact QTOF spectrometer. 1H and 13C NMR spectra were recorded on Varian® Mercury (200 MHz and 50 MHz respectively), or a Bruker® Avance (500 MHz and 125 MHz), and are internally referenced to residual solvent signals. Data for 1H NMR are reported as follows: chemical shift (δ ppm), integration, multiplicity (s = singlet, d = doublet, t = triplet, q = quartet, m = multiplet, br s = broad singlet), coupling constant and assignment. -
High Hazard Chemical Policy
Environmental Health & Safety Policy Manual Issue Date: 2/23/2011 Policy # EHS-200.09 High Hazard Chemical Policy 1.0 PURPOSE: To minimize hazardous exposures to high hazard chemicals which include select carcinogens, reproductive/developmental toxins, chemicals that have a high degree of toxicity. 2.0 SCOPE: The procedures provide guidance to all LSUHSC personnel who work with high hazard chemicals. 3.0 REPONSIBILITIES: 3.1 Environmental Health and Safety (EH&S) shall: • Provide technical assistance with the proper handling and safe disposal of high hazard chemicals. • Maintain a list of high hazard chemicals used at LSUHSC, see Appendix A. • Conduct exposure assessments and evaluate exposure control measures as necessary. Maintain employee exposure records. • Provide emergency response for chemical spills. 3.2 Principle Investigator (PI) /Supervisor shall: • Develop and implement a laboratory specific standard operation plan for high hazard chemical use per OSHA 29CFR 1910.1450 (e)(3)(i); Occupational Exposure to Hazardous Chemicals in Laboratories. • Notify EH&S of the addition of a high hazard chemical not previously used in the laboratory. • Ensure personnel are trained on specific chemical hazards present in the lab. • Maintain Material Safety Data Sheets (MSDS) for all chemicals, either on the computer hard drive or in hard copy. • Coordinate the provision of medical examinations, exposure monitoring and recordkeeping as required. 3.3 Employees: • Complete all necessary training before performing any work. • Observe all safety