Toxicological Profile for Tungsten
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Implications for Environmental and Economic Geology
UNIVERSITY OF CALIFORNIA RIVERSIDE Kinetics of the Dissolution of Scheelite in Groundwater: Implications for Environmental and Economic Geology A Thesis submitted in partial satisfaction of the requirements for the degree of Master of Science in Geological Sciences by Stephanie Danielle Montgomery March 2013 Thesis Committee: Dr. Michael A. McKibben, Chairperson Dr. Christopher Amrhein Dr. Timothy Lyons Copyright by Stephanie Danielle Montgomery 2013 The Thesis of Stephanie Danielle Montgomery is approved: _________________________________________ _________________________________________ _________________________________________ Committee Chairperson University of California, Riverside ABSTRACT OF THE THESIS Kinetics of the Dissolution of Scheelite in Groundwater: Implications for Environmental and Economic geology by Stephanie Danielle Montgomery Masters of Science, Graduate Program in Geological Sciences University of California, Riverside, March 2013 Dr. Michael McKibben, Chairperson Tungsten, an emerging contaminant, has no EPA standard for its permissible levels in drinking water. At sites in California, Nevada, and Arizona there may be a correlation between elevated levels of tungsten in drinking water and clusters of childhood acute lymphocytic leukemia (ALL). Developing a better understanding of how tungsten is released from rocks into surface and groundwater is therefore of growing environmental interest. Knowledge of tungstate ore mineral weathering processes, particularly the rates of dissolution of scheelite (CaWO4) in groundwater, could improve models of how tungsten is released and transported in natural waters. Our research focused on the experimental determination of the rates and products of scheelite dissolution in 0.01 M NaCl (a proxy for groundwater), as a function of temperature, pH, and mineral surface area. Batch reactor experiments were conducted within constant temperature circulation baths over a pH range of 3-10.5. -
The Radiochemistry of Tungsten
National Academy of Sciences !National Research Council NUCLEAR SCIENCE SERIES The Radiochemistry of Tungsten — ...—- L. F. C URTISS,Chairman ROBLEY D. EVANS, Vice Chairman NationalBureau ofStandards MassachusettsInstituteofTechnology J.A. DeJUREN, Secretary WestinghouseElectricCorporation C. J.BORKOWSKI J.W. IRVINE,JR. Oak RidgeNationalLaboratory MassachusettsI&tituteofTechnology ROBERT G. COCHRAN E. D. KLEMA Texas Agriculturaland Mechanical NorthwesternUniversity College W. WAYNE MEINKE SAMUEL EPSTEIN UniversityofMichigan CaliforniaInstituteofTechnology J.J.NICKSON Memorial Hospital,New York U. FANO NationalBureau ofStandards ROBERT L. PLATZMAN Laboratoirede Chimie Physique HERBERT GOLDSTEIN NuclearDevelopmentCorporationof D. M. VAN PATTER America BartolResearch Foundation LIAISON MEMBERS PAUL C. AEBERSOLD CHARLES K. REED Atomic Energy Commission U. S.Air Force J.HOWARD McMILLEN WILLIAM E. WRIGHT NationalScienceFoundation OfficeofNavalResearch SUBCOMMITTEE ON RADIOCHEMISTRY W. WAYNE MEINKE, Chai~man HAROLD KIRBY UniversityofMichigan Mound Laboratory GREGORY R. CHOPPIN GEORGE LEDDICOTTE FloridaStateUniversity Oak RidgeNationalLaboratory GEORGE A. COWAN JULIAN NIELSEN Los Alamos ScientificLaboratory HanfordLaboratories ARTHUR W. FAIRHALL ELLIS P. STEINBERG UniversityofWashington Argonne NationalLaboratory JEROME HUDIS PETER C. STEVENSON BrookhavenNationalLaboratory UniversityofCalifornia(Livermore) EARL HYDE LEO YAFFE UniversityofC slifornia(Berkeley) McGillUniversity CONSULTANTS NATHAN BALLOU JAMES DeVOE NavalRadiologicalDefenseLaboratory -
REPOSITORY of RESEARCH SYNOPSES for M.PHIL DEGREE PRESENTED to ASRB of UHS
REPOSITORY OF RESEARCH SYNOPSES FOR M.PHIL DEGREE PRESENTED To ASRB Of UHS Degree Student Name InstituteResearch Title Supervisor Report Status M.Phil Anatomy Dr Amer Qayum RMC Rawalpindi Morphology of human ascending aortic fold Prof. Tassaduq Hussain Sheikh Approved Dr. Ahmad Farzad M.Phil Anatomy UHS Lahore Effect of vitamin E on nephrotoxicity in methimazole induced hypothyroidism in albino mice Prof. Dr. Khalid Parvez Lone Approved Qureshi Dr. Aisha M.Phil Anatomy UHS Lahore Effect of Cinnamon bark oil on Cadmium induced testicular toxicity in adult male albino rats Prof. Dr. Muhammad Tahir Approved Muhammad Effect Of Citrullus colocynthis aqueous seed extract on beta cell regeneration and intra-islet M.Phil Anatomy Dr. Alia Amin UHS Lahore Prof. Dr. Muhammad Tahir Approved vasculature in alloxan induced diabetic male albino rats M.Phil Anatomy Dr. Alvia Batool PGMI Lahore Weight and histological changes induced by ribavirin in the testes of albino rats Prof. Dr. Fozia Farzana Approved The effects of Ficus carica L. (Anjir) leaf extract on gentamicin induced nephrotoxicity in adult M.Phil Anatomy Dr. Ammara Ghafoor UHS Lahore Prof. Dr. Khalid Parvez Lone Approved male albino mice Protective effect of aqueous extract of Carica papaya L. seeds on neproxen induced M.Phil Anatomy Dr. Ammara Riaz UHS Lahore Prof. Dr. Muhammad Tahir Approved nephrotoxicity in rats Histopathological effects of omeprazole on kidney of albino rats in different doses and M.Phil Anatomy Dr. Amna Mubeen PGMI Lahore Prof. Dr. Fozia Farzana Approved duration M.Phil Anatomy Dr. Aneeqa Chughtai UHS Lahore Anatomical variations of placentae in healthy pregnancies among local population Prof. -
Creation and Nuclear Reaction Studies Sorption Behaviour of Short
PL9601122 PL9601121 High-Spin Nuclear Target of 178m2Hf: Creation and Nuclear Reaction Studies Yu. Ts. Oganesian1, S.A. Karamian1, Yu. P. Gangrsky1, B. Gorski1, B.N. Markov1, Z. Szeglowski2, Ch. Briangon3, O. Constantinescu3, M. Hussonnois3, J. Pinard3, R. Kulessa4, H.J. Wollersheim4, G. Graw5, J. de Boer5, G. Huber6 and H.V. Muradian7 XFLNR, JINR Dubna, Russia; 2H. Niewodniczanski Institute Nuclear Physics, Krakow, Poland; 3CSNSM, IPN, Orsay, France; 4GSI, Darmstadt, Germany; 6Miinchen University, Germany; 6Mainz University, Germany; 7Kurchatov Institute, Moscow, Russia. Investigations of the hafnium-178 isomers are a new scientific direction promising the devel- opment of a fundamental knowledge both in the field of the nuclear structure and of nuclear reactions. The completed experiments give grounds for hope of obtaining data on the electro- magnetic moments, on the mean radius and the deformation of the 178Hf nucleus in the state 16+, on the wave function structure of this state, as well as to study the influence of the target high spin on the differential cross sections of nuclear reactions, to find and investigate neutron resonances with a high spin, to obtain direct information on the density of the levels in the earlier inaccessible region of the spin and of the excitation energy, to measure directly the parameters of a giant dipole resonance based on the high spin state and to clarify in detail the role of the structure hindrances in nuclear reactions. Sorption Behaviour of Short-Lived W and Hf Isotopes on Ion Exchangers from HC1/HF Solutions in Fast On-Line Experiments D. Schumann1, R. Dressier1, S. Fischer1, St. -
Hydrogen Peroxide Material Compatibility Chart from ISM and IS
ver 09-Jul-2020 Hydrogen Peroxide Material Compatibility Chart All wetted surfaces should be made of materials that are compatible with hydrogen peroxide. The wetted area or surface of a part, component, vessel or piping is a surface which is in permanent contact with or is permanently exposed to the process fluid (liquid or gas). Less than 8% concentration H2O2 is considered a non-hazardous substance. Typically encountered versions are baking soda-peroxide toothpaste (0.5%), contact lens sterilizer (2%), over-the-counter drug store Hydrogen Peroxide (3%), liquid detergent non-chlorine bleach (5%) and hair bleach (7.5%). At 8% to 28% H2O2 is rated as a Class 1 Oxidizer. At these concentrations H2O2 is usually encountered as a swimming pool chemical used for pool shock treatments. In the range of 28.1% to 52% concentrations, H2O2 is rated as a Class 2 Oxidizer, a Corrosive and a Class 1 Unstable (reactive) substance. At these concentrations, H2O2 is considered industrial strength grade. Concentrations from 52.1% to 91% are rated as Class 3 Oxidizers, Corrosive and Class 3 Unstable (reactive) substances. H2O2 at these concentrations are used for specialty chemical processes. At concentrations above 70%, H2O2 is usually designated as high-test peroxide (HTP). Concentrations of H2O2 greater than 91% are currently used as rocket propellant. At these concentrations, H2O2 is rated as a Class 4 Oxidizer, Corrosive and a Class 3 Unstable (reactive) substance. Compatibility Compatibility Compatibility Compatibility Material 10% H2O2 30% H2O2 50% -
Safety Data Sheet
SAFETY DATA SHEET SECTION 1: Identification of the substance/mixture and of the company/undertaking 1.1. Product identifier Name of the substance Sodium tungstate Identification number 13472-45-2 (CAS number) Synonyms SODIUM TUNGSTATE * Tungstic acid, Disodium salt Issue date 18-May-2015 Version number 02 Revision date 14-July-2015 Supersedes date 18-May-2015 1.2. Relevant identified uses of the substance or mixture and uses advised against Identified uses Not available. Uses advised against None known. 1.3. Details of the supplier of the safety data sheet Supplier Company name Materion Advanced Chemicals Inc. Address 407 N. 13th Street 1316 W. St. Paul Avenue Milwaukee, WI 53233 United States Division Milwaukee Telephone 414.212.0257 e-mail [email protected] Contact person Noreen Atkinson 1.4. Emergency telephone number SECTION 2: Hazards identification 2.1. Classification of the substance or mixture The substance has been assessed and/or tested for its physical, health and environmental hazards and the following classification applies. Classification according to Directive 67/548/EEC or 1999/45/EC as amended Classification Xn;R22, R52/53 The full text for all R-phrases is displayed in section 16. Classification according to Regulation (EC) No 1272/2008 as amended Health hazards Acute toxicity, oral Category 4 H302 - Harmful if swallowed. H302 - Harmful if swallowed. Environmental hazards Hazardous to the aquatic environment, Category 3 H412 - Harmful to aquatic life with long-term aquatic hazard long lasting effects. Hazard summary Physical hazards Not classified for physical hazards. Health hazards Harmful if swallowed. Occupational exposure to the substance or mixture may cause adverse health effects. -
Ceramic Carbides: the Tough Guys of the Materials World
Ceramic Carbides: The Tough Guys of the Materials World by Paul Everitt and Ian Doggett, Technical Specialists, Goodfellow Ceramic and Glass Division c/o Goodfellow Corporation, Coraopolis, Pa. Silicon carbide (SiC) and boron carbide (B4C) are among the world’s hardest known materials and are used in a variety of demanding industrial applications, from blasting-equipment nozzles to space-based mirrors. But there is more to these “tough guys” of the materials world than hardness alone—these two ceramic carbides have a profile of properties that are valued in a wide range of applications and are worthy of consideration for new research and product design projects. Silicon Carbide Use of this high-density, high-strength material has evolved from mainly high-temperature applications to a host of engineering applications. Silicon carbide is characterized by: • High thermal conductivity • Low thermal expansion coefficient • Outstanding thermal shock resistance • Extreme hardness FIGURE 1: • Semiconductor properties Typical properties of silicon carbide • A refractive index greater than diamond (hot-pressed sheet) Chemical Resistance Although many people are familiar with the Acids, concentrated Good Acids, dilute Good general attributes of this advanced ceramic Alkalis Good-Poor (see Figure 1), an important and frequently Halogens Good-Poor overlooked consideration is that the properties Metals Fair of silicon carbide can be altered by varying the Electrical Properties final compaction method. These alterations can Dielectric constant 40 provide knowledgeable engineers with small Volume resistivity at 25°C (Ohm-cm) 103-105 adjustments in performance that can potentially make a significant difference in the functionality Mechanical Properties of a finished component. -
A Sustainable Approach for Tungsten Carbide Synthesis Using Renewable Biopolymers Monsur Islam Clemson University
Clemson University TigerPrints Publications Mechanical Engineering 9-2017 A sustainable approach for tungsten carbide synthesis using renewable biopolymers Monsur Islam Clemson University Rodrigo Martinez-Duarte Clemson University, [email protected] Follow this and additional works at: https://tigerprints.clemson.edu/mecheng_pubs Part of the Mechanical Engineering Commons Recommended Citation Please use the publisher's recommended citation. http://www.sciencedirect.com/science/article/pii/S0272884217309239 This Article is brought to you for free and open access by the Mechanical Engineering at TigerPrints. It has been accepted for inclusion in Publications by an authorized administrator of TigerPrints. For more information, please contact [email protected]. A sustainable approach for tungsten carbide synthesis using renewable biopolymers Monsur Islam and Rodrigo Martinez-Duarte∗ Multiscale Manufacturing Laboratory, Department of Mechanical Engineering, Clemson University, Clemson, SC, USA Abstract Here we present a sustainable, environment-friendly and energy-efficient approach for synthesis of porous tungsten carbide (WC). A biopolymer-metal oxide composite featuring iota-carrageenan, chitin and tungsten trioxide (WO3) was used as the precursor material. The reaction mechanism for the synthesis of WC was estimated using the results from X-ray diffraction characterization (XRD). A synthesis temperature of 1300 ºC and dwell time of 3 hours were found to be the optimum process parameters to obtain WC >98% pure. The grain size, porosity and Brunauer–Emmett–Teller (BET) surface area of the synthesized WC were characterized using field emission scanning electron microscopy, high resolution transmission electron microscopy and nitrogen adsorption-desorption. A mesoporous WC was synthesized here with a grain size around 20 nm and BET surface area of 67.03 m2/g. -
IN a PACK SIZE of 100Ml 2 3,3 DIAMINOBENZIDINE TETRAHYDROCHLORIDE, in a PACK SIZE of 5Gm
Item NAME OF THE ITEM No. Group 1 Pathology 1 2 MERCAPTOETHANOL (2-ME), IN A PACK SIZE OF 100ml 2 3,3 DIAMINOBENZIDINE TETRAHYDROCHLORIDE, IN A PACK SIZE OF 5gm 3 A.P.T.T WITH CALCIUM CHLORIDE (LIQUID STABLE), IN A PACK SIZE OF 1 X 3ml 4 A.P.T.T WITH CALCIUM CHLORIDE (LIQUID STABLE), IN A PACK SIZE OF 1 X 4 ml 5 ACETIC ACID GLACIAL (AR), IN A PACK SIZE OF 2.5 LITRES 6 ACETIC ACID GLACIAL (AR), IN A PACK SIZE OF 500ml 7 ACETONE, IN A PACK SIZE OF 2.5 LITRES 8 ACETONE, IN A PACK SIZE OF 500ml 9 ACID FUSCHIN, IN A PACK SIZE OF 25gm 10 ACTIVATED CHARCOAL, 500 gm 11 AET (2-AMINOETHYL ISO THIOURANIUMBROMIDE) 100 gm 12 ALCIAN BLUE, IN A PACK SIZE OF 5gm 13 ALUMINIUM CHLORIDE ANHYDROUS, IN A PACK SIZE OF 500gm 14 ALUMINIUM HYDROXIDE, IN A PACK SIZE OF 500gm 15 ALUMINIUM SULPHATE 500gm 16 AMMONIUM FERROUS SULPHATE 500gm 17 AMMONIUM OXALATE, IN A PACK SIZE OF 500gm ANTI - A ANTISERA MONOCLONAL 18 AVIDITY - 3-4 SECONDS TITRE - 1:256 IN A PACK SIZE OF 6 X 10 ml ANTI - B ANTISERA MONOCLONAL 19 AVIDITY - 3-4 SECONDS TITRE - 1:256 , IN A PACK SIZE OF 6 X 10 ml ANTI - D Igm MONOCLONAL 20 AVIDITY - 5-10 SECONDS TITRE - 1:128 , IN A PACK SIZE OF 6 X 10 ml ANTI - D Igm + IgG BLEND 21 AVIDITY - 10-20 SECONDS TITRE - 1:256 IN A PACK SIZE OF 6 X 10 ml 22 APTT CONTROL , IN A PACK SIZE OF 12 X 1 ml 23 Aqueous Borax 125 ml Page 1 of 52 24 Borax Carmine Powder 25 gm 25 Ammonium Sulphate Crystals 500gm 26 BARIUM CHLORIDE (AR), IN A PACK SIZE OF 500gm 27 BASIC FUSCHIN, IN A PACK SIZE OF 25gm 28 BENEDICT'S REAGENT (QUALITATIVE), IN A PACK SIZE OF 5LITRES 29 BENZIDINE, IN A PACK SIZE OF 50gm 30 BIEBRICH SCARLET, IN A PACK SIZE OF 25gm 31 BRILLIANT CRESYL BLUE (POWDER), IN A PACK SIZE OF 25gm 32 BRILLIANT CRESYL BLUE (SOLN.), IN A PACK SIZE OF 100 ml 33 BROMELAINE Lowest Pack Size 34 CALCIUM CHLORIDE ANHYDROUS, IN A PACK SIZE OF 500gm. -
In Search of the Active Sites for the Selective Catalytic Reduction on Tungsten-Doped Vanadia Monolayer Catalysts Supported By
In Search of the Active Sites for the Selective Catalytic Reduction on Tungsten-Doped Vanadia Monolayer Catalysts supported by TiO2 Mengru Li,y Sung Sakong,y and Axel Groß∗,y,z yInstitute of Theoretical Chemistry, Ulm University, 89069 Ulm, Germany zHelmholtz Institute Ulm (HIU), Electrochemical Energy Storage, 89069 Ulm, Germany E-mail: [email protected] Abstract Tungsten-doped vanadia-based catalysts supported on anatase TiO2 are used to re- duce hazardous NO emissions through the selective catalytic reduction of ammonia, but their exact atomistic structure is still largely unknown. In this computational study, the atomistic structure of mixed tungsta-vanadia monolayers on TiO2 support under typical operating conditions has been addressed by periodic density functional theory calcu- lations. The chemical environment has been taken into account in a grand-canonical approach. We evaluate the stable catalyst structures as a function of the oxygen chemi- cal potential and vanadium and tungsten concentrations. Thus we determine structural motifs of tungsta-vanadia/TiO2 catalysts that are stable under operating conditions. Furthermore, we identify active sites that promise high catalytic activity for the selec- tive catalytic reduction by ammonia. Our calculations reveal the critical role of the stoichiometry of the tungsta-vanadia layers with respect to their catalytic activity in the selective catalytic reduction. 1 Keywords Vanadium-based catalyst; Density functional theory; Selective Catalytic Reduction; stoi- chiometry; chemical potential Introduction Nitrogen oxide (NOx) emission from various stationary and mobile sources is significantly contributing to air pollution and causing, among others, ozone depletion, smog, acid rain, 1,2 eutrophication, and eventually global warming. -
Metastable Non-Nucleonic States of Nuclear Matter: Phenomenology
Physical Science International Journal 15(2): 1-25, 2017; Article no.PSIJ.34889 ISSN: 2348-0130 Metastable Non-Nucleonic States of Nuclear Matter: Phenomenology Timashev Serge 1,2* 1Karpov Institute of Physical Chemistry, Moscow, Russia. 2National Research Nuclear University MEPhI, Moscow, Russia. Author’s contribution The sole author designed, analyzed and interpreted and prepared the manuscript. Article Information DOI: 10.9734/PSIJ/2017/34889 Editor(s): (1) Prof. Yang-Hui He, Professor of Mathematics, City University London, UK And Chang-Jiang Chair Professor in Physics and Qian-Ren Scholar, Nan Kai University, China & Tutor and Quondam-Socius in Mathematics, Merton College, University of Oxford, UK. (2) Roberto Oscar Aquilano, School of Exact Science, National University of Rosario (UNR),Rosario, Physics Institute (IFIR)(CONICET-UNR), Argentina. Reviewers: (1) Alejandro Gutiérrez-Rodríguez, Universidad Autónoma de Zacatecas, Mexico. (2) Arun Goyal, Delhi University, India. (3) Stanislav Fisenko, Moscow State Linguistic University, Russia. Complete Peer review History: http://www.sciencedomain.org/review-history/20031 Received 17 th June 2017 Accepted 8th July 2017 Original Research Article th Published 13 July 2017 ABSTRACT A hypothesis of the existence of metastable states for nuclear matter with a locally shaken-up nucleonic structure of the nucleus, was proposed earlier. Such states are initiated by inelastic scattering of electrons by nuclei along the path of weak nuclear interaction. The relaxation of such nuclei is also determined by weak interactions. The use of the hypothesis makes it possible to physically interpret a rather large group of experimental data on the initiation of low energy nuclear reactions (LENRs) and the acceleration of radioactive α- and β-decays in a low-temperature plasma. -
Free of Cost CONTENTS Tender Letter Terms & Conditions with Annexure Check List of the Documents Item Schedule
ESIC E-TENDER ENQUIRY FORM FOR SUPPLY OF LAB REAGENTS, CHEMICAL AND KITS E-Tender Enquiry Form – Free of cost CONTENTS Tender Letter Terms & Conditions with Annexure Check List of the Documents Item Schedule EMPLOYEE’S STATE INSURANCE CORPORATION MEDICAL COLLEGE & HOSPITAL, NH-3 NIT FARIDABAD-121001 LAST DATE OF SUBMISSION OF ONLINE: 09/08/2021 For any further clarifications/queries for e-Procurement Portal, Please contact at: 0129-2970111 CPPP Id for Support / Helpdesk -https://eprocure.gov.in/eprocure/app ESIC Medical College and Hospital NH-3, Faridabad, Haryana- 121001 Tel No: 0129-4156471, Website: www.esic.nic.in E- Tender Enquiry No.134/U/16/30/R.C Lab, Chemical & Kits /2021-Med. Store, Dated:19/07/2021 Dean, ESIC Medical College & Hospital, NH-3, NIT Faridabad invites online e-Tender for the Rate Contract for supply of LAB REAGENTS, CHEMICAL AND KITS, through e- procurement portal- https://eprocure.gov.in/eprocure/app BRIEF OF ESIC RATE CONTRACT 1. It is proposed to enter into a Running Rate Contract with bidder(s)/ firm(s) which fulfill the eligibility criteria approved by Dean, ESIC Medical College & Hospital, NH-3, NIT Faridabad for supply of LAB REAGENTS, CHEMICAL AND KITS/ items enumerated in the schedule annexure B. The eligibility criteria have been given in the terms and conditions as annexure A. Bidder(s)/ Firm(s) intending to participate in the rate contract should first ensure that they fulfill all the eligibility criteria as prescribed under the terms and conditions, otherwise the tenders will be summarily rejected. 2. The Rate Contract will be governed by the terms and conditions enclosed with this Tender Enquiry and no modifications / alterations etc.