Toxicological Profile for Zinc
Total Page：16
File Type：pdf, Size：1020Kb
Load more
Recommended publications
-
Title Effect of Ph Values on the Formation and Solubility Of
CORE Metadata, citation and similar papers at core.ac.uk Provided by Kyoto University Research Information Repository Effect of pH Values on the Formation and Solubility of Zinc Title Compounds Takada, Toshio; Kiyama, Masao; Torii, Hideo; Asai, Author(s) Toshihiro; Takano, Mikio; Nakanishi, Norihiko Bulletin of the Institute for Chemical Research, Kyoto Citation University (1978), 56(5): 242-246 Issue Date 1978-12-20 URL http://hdl.handle.net/2433/76795 Right Type Departmental Bulletin Paper Textversion publisher Kyoto University Bull.Inst. Chem.Res., Kyoto Univ., Vol. 56, No. 5, 1978 Effect of pH Values on the Formation and Solubility of Zinc Compounds Toshio TAKADA,Masao KIYAMA,Hideo TORII, Toshihiro AsAI* Mikio TAKANO**,and Norihiko NAKANISHI** ReceivedJuly 31, 1978 Aqueoussuspensions, prepared by mixingthe solution of NaOHand that ofzinc sulfate,chloride or nitrate,were subjected to agingat 25,50, and 70°C. Examinationof the productsby X-ray pow- der diffractionshowed that zinc oxide,basic zinc sulfate, chloride and nitrate are formeddepending mainlyon the pH. Their solubilitiesin the suspensionmedia with differentpH valueswere deter- mined at 25°C. INTRODUCTION In our laboratory, iron oxides and oxide hydroxides were prepared by wet methods such as the hydrolysis and slow oxidation of aqueous solutions of iron salts. The condi- tions for the formation of the oxides and oxide hydroxides') were reported together with their properties.2l The formation of a variety of products must be considered to be due to the difference in the nature -
Evolution and Understanding of the D-Block Elements in the Periodic Table Cite This: Dalton Trans., 2019, 48, 9408 Edwin C
Dalton Transactions View Article Online PERSPECTIVE View Journal | View Issue Evolution and understanding of the d-block elements in the periodic table Cite this: Dalton Trans., 2019, 48, 9408 Edwin C. Constable Received 20th February 2019, The d-block elements have played an essential role in the development of our present understanding of Accepted 6th March 2019 chemistry and in the evolution of the periodic table. On the occasion of the sesquicentenniel of the dis- DOI: 10.1039/c9dt00765b covery of the periodic table by Mendeleev, it is appropriate to look at how these metals have influenced rsc.li/dalton our understanding of periodicity and the relationships between elements. Introduction and periodic tables concerning objects as diverse as fruit, veg- etables, beer, cartoon characters, and superheroes abound in In the year 2019 we celebrate the sesquicentennial of the publi- our connected world.7 Creative Commons Attribution-NonCommercial 3.0 Unported Licence. cation of the first modern form of the periodic table by In the commonly encountered medium or long forms of Mendeleev (alternatively transliterated as Mendelejew, the periodic table, the central portion is occupied by the Mendelejeff, Mendeléeff, and Mendeléyev from the Cyrillic d-block elements, commonly known as the transition elements ).1 The periodic table lies at the core of our under- or transition metals. These elements have played a critical rôle standing of the properties of, and the relationships between, in our understanding of modern chemistry and have proved to the 118 elements currently known (Fig. 1).2 A chemist can look be the touchstones for many theories of valence and bonding. -
Transport of Dangerous Goods
ST/SG/AC.10/1/Rev.16 (Vol.I) Recommendations on the TRANSPORT OF DANGEROUS GOODS Model Regulations Volume I Sixteenth revised edition UNITED NATIONS New York and Geneva, 2009 NOTE The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the Secretariat of the United Nations concerning the legal status of any country, territory, city or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries. ST/SG/AC.10/1/Rev.16 (Vol.I) Copyright © United Nations, 2009 All rights reserved. No part of this publication may, for sales purposes, be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, electrostatic, magnetic tape, mechanical, photocopying or otherwise, without prior permission in writing from the United Nations. UNITED NATIONS Sales No. E.09.VIII.2 ISBN 978-92-1-139136-7 (complete set of two volumes) ISSN 1014-5753 Volumes I and II not to be sold separately FOREWORD The Recommendations on the Transport of Dangerous Goods are addressed to governments and to the international organizations concerned with safety in the transport of dangerous goods. The first version, prepared by the United Nations Economic and Social Council's Committee of Experts on the Transport of Dangerous Goods, was published in 1956 (ST/ECA/43-E/CN.2/170). In response to developments in technology and the changing needs of users, they have been regularly amended and updated at succeeding sessions of the Committee of Experts pursuant to Resolution 645 G (XXIII) of 26 April 1957 of the Economic and Social Council and subsequent resolutions. -
NBO Applications, 2020
NBO Bibliography 2020 2531 publications – Revised and compiled by Ariel Andrea on Aug. 9, 2021 Aarabi, M.; Gholami, S.; Grabowski, S. J. S-H ... O and O-H ... O Hydrogen Bonds-Comparison of Dimers of Thiocarboxylic and Carboxylic Acids Chemphyschem, (21): 1653-1664 2020. 10.1002/cphc.202000131 Aarthi, K. V.; Rajagopal, H.; Muthu, S.; Jayanthi, V.; Girija, R. Quantum chemical calculations, spectroscopic investigation and molecular docking analysis of 4-chloro- N-methylpyridine-2-carboxamide Journal of Molecular Structure, (1210) 2020. 10.1016/j.molstruc.2020.128053 Abad, N.; Lgaz, H.; Atioglu, Z.; Akkurt, M.; Mague, J. T.; Ali, I. H.; Chung, I. M.; Salghi, R.; Essassi, E.; Ramli, Y. Synthesis, crystal structure, hirshfeld surface analysis, DFT computations and molecular dynamics study of 2-(benzyloxy)-3-phenylquinoxaline Journal of Molecular Structure, (1221) 2020. 10.1016/j.molstruc.2020.128727 Abbenseth, J.; Wtjen, F.; Finger, M.; Schneider, S. The Metaphosphite (PO2-) Anion as a Ligand Angewandte Chemie-International Edition, (59): 23574-23578 2020. 10.1002/anie.202011750 Abbenseth, J.; Goicoechea, J. M. Recent developments in the chemistry of non-trigonal pnictogen pincer compounds: from bonding to catalysis Chemical Science, (11): 9728-9740 2020. 10.1039/d0sc03819a Abbenseth, J.; Schneider, S. A Terminal Chlorophosphinidene Complex Zeitschrift Fur Anorganische Und Allgemeine Chemie, (646): 565-569 2020. 10.1002/zaac.202000010 Abbiche, K.; Acharjee, N.; Salah, M.; Hilali, M.; Laknifli, A.; Komiha, N.; Marakchi, K. Unveiling the mechanism and selectivity of 3+2 cycloaddition reactions of benzonitrile oxide to ethyl trans-cinnamate, ethyl crotonate and trans-2-penten-1-ol through DFT analysis Journal of Molecular Modeling, (26) 2020. -
UNITED STATES PATENT OFFICE 2,668,795 WHITE Brass PLATING Christian J
Patented Feb. 9, 1954 2,668,795 UNITED STATES PATENT OFFICE 2,668,795 WHITE BRAss PLATING Christian J. Wernlund, Niagara Falls, N. Y., as signor to E. I. du Pont de Nemours and Con pany, Wilmington, Del, a corporation of Dela Wale No Drawing. Application July 28, 1951, Seria No. 239,190 12 Claims. (C. 204-44) 2 This invention relates to the electroplating of The foregoing objects may be attained in ac a White zinc copper alloy from an electrolyte cordance with the present invention by electro containing the cyanides of zinc and copper. plating a white zinc copper alloy from an aque Wernlund U. S. P. 2,181,773 describes the elec ous cyanide-containing electrolyte which con trodeposition of a “white brass' from a cyanide tains a Small amount of a Vanadium compound electrolyte. This white zinc copper alloy elec and preferably also a benzaldehyde-aliphatic trodeposit may be electroplated in accordance ether. Employing both of the above-mentioned With the Wernlund patent to produce a semi addition agents, white brass electrodeposits are bright or bright electrodeposit, which is useful obtained with excellent brightness Over a Wide as undercoating for chromium plating and which, O range of current densities without the addition Without a chromium overdeposit, forms an ex of hydrogen peroxide. For example, by the here cellent, corrosion resistant, decorative finish for in described process I have been able to electro articles made of steel, copper, yellow brass and deposit excellent bright white brass. Within the zinc. As undercoat for chromium plating, the current density range of from 5 to 90 amps. -
Ion in Fluorescence Tuning of Tridentate Pincers: a Review
molecules Review The Role of Zinc(II) Ion in Fluorescence Tuning of Tridentate Pincers: A Review Rosita Diana and Barbara Panunzi * Department of Agriculture, University of Napoli Federico II, via Università 100, 80055 Portici NA, Italy; [email protected] * Correspondence: [email protected] Academic Editors: Jorge Bañuelos Prieto and Ugo Caruso Received: 6 October 2020; Accepted: 25 October 2020; Published: 28 October 2020 Abstract: Tridentate ligands are simple low-cost pincers, easy to synthetize, and able to guarantee stability to the derived complexes. On the other hand, due to its unique mix of structural and optical properties, zinc(II) ion is an excellent candidate to modulate the emission pattern as desired. The present work is an overview of selected articles about zinc(II) complexes showing a tuned fluorescence response with respect to their tridentate ligands. A classification of the tridentate pincers was carried out according to the binding donor atom groups, specifically nitrogen, oxygen, and sulfur donor atoms, and depending on the structure obtained upon coordination. Fluorescence properties of the ligands and the related complexes were compared and discussed both in solution and in the solid state, keeping an eye on possible applications. Keywords: zinc ion; fluorescence; tridentate ligand 1. Introduction Over the past 20 years, fluorescence-responsive compounds are increasingly required for many technological applications, from lighting and switch devices to bio-imaging and analytical probes. Materials based on transition metal complexes were advantageously utilized. In this area, interest is growing in the abundant, less expensive, and environmentally “green” zinc(II) metal cation. Today, science is in great demand to address the challenge of sustainability. -
Zinc Cyanide Zcn
ZINC CYANIDE ZCN CAUTIONARY RESPONSE INFORMATION 4. FIRE HAZARDS 7. SHIPPING INFORMATION 4.1 Flash Point: 7.1 Grades of Purity: 55% Zn 40% Cn Common Synonyms Solid-powder Greyish white to white Odorless Not flammable 7.2 Storage Temperature: Ambient Cyanide of zinc 4.2 Flammable Limits in Air: Not flammable Zinc dicyanide 7.3 Inert Atmosphere: Currently not available 4.3 Fire Extinguishing Agents: Not pertinent Sinks in water. 7.4 Venting: Currently not available 4.4 Fire Extinguishing Agents Not to Be 7.5 IMO Pollution Category: Currently not available Keep people away. AVOID CONTACT WITH SOLID. Used: Not pertinent Wear goggles, self-contained breathing apparatus, and rubber overclothing (including gloves). 4.5 Special Hazards of Combustion 7.6 Ship Type: Currently not available Notify local health and pollution control agencies. Products: Not pertinent 7.7 Barge Hull Type: Currently not available Protect water intakes. 4.6 Behavior in Fire: Not pertinent Not flammable. 4.7 Auto Ignition Temperature: Not 8. HAZARD CLASSIFICATIONS Fire flammable 8.1 49 CFR Category: Poison 4.8 Electrical Hazards: Currently not available 8.2 49 CFR Class: 6.1 CALL FOR MEDICAL AID. 4.9 Burning Rate: Not flammable 8.3 49 CFR Package Group: I Exposure DUST 8.4 Marine Pollutant: Yes POISONOUS IF INHALED OR IF SKIN IS EXPOSED. 4.10 Adiabatic Flame Temperature: Currently Move to fresh air. not available 8.5 NFPA Hazard Classification: 4.11 Stoichometric Air to Fuel Ratio: Not If breathing has stopped, give artificial respiration. Category Classification If breathing is difficult, give oxygen. -
Sunscreen Faqs
Sunscreen FAQs What type of sunscreen should I use? There are two main types of sunscreen ingredients: physical sun blockers and chemical sunscreens. Physical sunscreens prevent ultraviolet light from reaching your skin, and contain either zinc oxide or titanium dioxide. Physical sunscreens protect against UVA and UVB damage. Physical sunscreens are preferred for patients with sensitive skin or children. Chemical sunscreens rely on an interaction between the sun and the chemical to protect your skin. Examples of such chemicals are avobenzone, octinoxate, homosalate, padimate O, and many others. Chemical sunscreens can protect against UVA, UVB, or both types of damage, depending on which ingredient is used. Read the label to ensure coverage for both UVA and UVB exposure. There are new ingredients being developed that take chemical sunscreens and stabilize them to prolong their activity (i.e., Helioplex, Mexoryl). Does the SPF really matter? In laboratory testing, there are minor differences between SPF 15 and SPF 30 or greater products. However, that data is based on using 1 oz. (30 gm.) of sunscreen for each full body application (the size of a shot glass). Most people use far less in real-life settings. For that reason, we recommend an SPF of at least 30. It is common to find good sunscreens with SPF ranging from 45-70. To maintain protection, reapply sunscreen every 1-3 hours, depending on sweating, water exposure, and sun intensity. Is sunscreen alone enough to protect my skin in the sun? In some cases, yes. However, if you are in the sun for longer periods on a regular basis (such as gardening, golfing, boating, sports), it may be better to add sun protective clothing or habits. -
A Practical Guide to the Use of Luting Cements a Peer-Reviewed Publication Written by John O
Earn 4 CE credits This course was written for dentists, dental hygienists, and assistants. 1992 1850s Early 1900s 1972 Resin- Zinc oxide 1900s Zinc Glass modified eugenol Zinc poly- ionomers glass phosphate carboxylate ionomers Early 2000s Self- adhesive cements A Practical Guide To The Use Of Luting Cements A Peer-Reviewed Publication Written by John O. Burgess, DDS, MS and Taneet Ghuman, BDS PennWell is an ADA CERP Recognized Provider Go Green, Go Online to take your course This course has been made possible through an unrestricted educational grant. The cost of this CE course is $59.00 for 4 CE credits. Cancellation/Refund Policy: Any participant who is not 100% satisfied with this course can request a full refund by contacting PennWell in writing. Educational Objectives a clinical success. The first change increased the strength Overall goal: The purpose of this article is to provide dental of the mixed material, allowing it to be used for permanent professionals with information on the selection and applica- cementation, and the second produced an easy-to-mix tion of luting cements. paste-paste system for provisional cementation that is still Upon completion of this course, the clinician will be able in use today.2,3 While the cement had an obtunding effect to do the following: on pulp, its disadvantages, including a high film thickness, 1. List the types of luting cements and their chemical have limited its use.4 The physical properties of dental ce- composition. ments appear in Table 1. 2. List the physical properties that affect the performance of luting cements. -
Structural Diversity of Anodic Zinc Oxide Controlled by the Type Of
Reviews ChemElectroChem doi.org/10.1002/celc.202100216 Zinc Anodizing: Structural Diversity of Anodic Zinc Oxide Controlled by the Type of Electrolyte Katja Engelkemeier,*[a, c] Aijia Sun,[a, c] Dietrich Voswinkel,[b, c] Olexandr Grydin,[b, c] Mirko Schaper,[b, c] and Wolfgang Bremser[a, b] ChemElectroChem 2021, 8, 1–15 1 © 2021 The Authors. ChemElectroChem published by Wiley-VCH GmbH These are not the final page numbers! �� Wiley VCH Dienstag, 18.05.2021 2199 / 204431 [S. 1/15] 1 Reviews ChemElectroChem doi.org/10.1002/celc.202100216 Anodic zinc oxide (AZO) layers are attracting interdisciplinary The article gives an overview of the different possibilities of research interest. Chemists, physicists and materials scientists anodic treatment, whereby the voltage and the current type are are increasingly devoting attention to fundamental and the main distinguishing criteria. Presented is the electrolytic application-related research on these layers. Research work oxidation (anodizing) and the electrolytic plasma oxidation focuses on the application as semiconductor, corrosion protec- (EPO). The electrolytic etching is also a process of anodic tor, adhesion promoter, abrasion protector, or antibacterial treatment. However, it does not produce AZO layers, but rather surfaces. The structure and crystallinity essentially determine a degradation of the zinc layer. The review article shows the the properties of the AZO coatings. The type and concentration parameters used so far (electrolyte, current type, current of the electrolyte, the applied current density or voltage as well density, voltage) and points out the influence on the formation as the duration time enable layer structures of structural variety. of AZO structures in dependency to the used electrolyte. -
Zinc Oxide and Zinc Hydroxide Formation Via Aqueous Precipitation: Effect of the Preparation Route and Lysozyme Addition
Materials Chemistry and Physics 167 (2015) 77e87 Contents lists available at ScienceDirect Materials Chemistry and Physics journal homepage: www.elsevier.com/locate/matchemphys Zinc oxide and zinc hydroxide formation via aqueous precipitation: Effect of the preparation route and lysozyme addition * Ayben Top , Hayrullah Çetinkaya _ _ Department of Chemical Engineering, Izmir Institute of Technology, Urla-Izmir, 35430, Turkey highlights graphical abstract Aqueous precipitation products of Zn(NO3)2 and NaOH were prepared. Synthesis route and lysozyme addi- tion affected morphology of the products. ε-Zn(OH)2, b-Zn(OH)2, and ZnO crys- tal structures were observed. Lysozyme-ZnO/Zn(OH)2 composites with ~5e20% lysozyme content were obtained. article info abstract Article history: Aqueous precipitation products of Zn(NO3)2 and NaOH obtained by changing the method of combining Received 13 February 2015 the reactants and by using lysozyme as an additive were investigated. In the case of single addition Received in revised form method, octahedral ε-Zn(OH)2 and plate-like b-Zn(OH)2 structures formed in the absence and in the 20 August 2015 presence of lysozyme, respectively. Calcination of these Zn(OH) samples at 700 C yielded porous ZnO Accepted 10 October 2015 2 structures by conserving the template crystals. When zinc source was added dropwise into NaOH so- Available online 24 October 2015 lution, predominantly clover-like ZnO crystals were obtained independent of lysozyme addition. Mixed spherical and elongated ZnO morphology was observed when NaOH was added dropwise into Zn(NO ) Keywords: 3 2 Oxides solution containing lysozyme. Lysozyme contents of the precipitation products were estimated as in the e fi Composite materials range of ~5 20% and FTIR indicated no signi cant conformational change of lysozyme in the composite. -
Synergistic Effects of Zinc Oxide Nanoparticles and Bacteria Reduce Heavy Metals Toxicity in Rice (Oryza Sativa L.) Plant
toxics Article Synergistic Effects of Zinc Oxide Nanoparticles and Bacteria Reduce Heavy Metals Toxicity in Rice (Oryza sativa L.) Plant Nazneen Akhtar 1, Sehresh Khan 1, Shafiq Ur Rehman 2, Zia Ur Rehman 1, Amana Khatoon 3, Eui Shik Rha 4,* and Muhammad Jamil 1,* 1 Department of Biotechnology and Genetic Engineering, Kohat University of Science & Technology (KUST), Kohat 26000, Pakistan; [email protected] (N.A.); [email protected] (S.K.); [email protected] (Z.U.R.) 2 Department of Biology, University of Haripur, Haripur 22620, Pakistan; drshafi[email protected] 3 Department of Environmental and Botanical Sciences, Kohat University of Science & Technology (KUST), Kohat 26000, Pakistan; [email protected] 4 Department of Well-Being Resources, Sunchon National University, Suncheon 540-742, Korea * Correspondence: [email protected] (E.S.R.); [email protected] (M.J.) Abstract: Heavy metals (HMs) are toxic elements which contaminate the water bodies in developing countries because of their excessive discharge from industrial zones. Rice (Oryza sativa L) crops are submerged for a longer period of time in water, so irrigation with HMs polluted water possesses toxic effects on plant growth. This study was initiated to observe the synergistic effect of bacteria (Bacillus cereus and Lysinibacillus macroides) and zinc oxide nanoparticles (ZnO NPs) (5, 10, 15, 20 and 25 mg/L) on the rice that were grown in HMs contaminated water. Current findings have revealed that bacteria, along with ZnO NPs at lower concentration, showed maximum removal of HMs from polluted water at pH 8 (90 min) as compared with higher concentrations. Seeds primed with bacteria grown in Citation: Akhtar, N.; Khan, S.; HM polluted water containing ZnO NPs (5 mg/L) showed reduced uptake of HMs in root, shoot Rehman, S.U.; Rehman, Z.U.; and leaf, thus resulting in increased plant growth.