Permissible Exposure Limits for Chemical Contaminants
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Growth Regulation and Other Secondary Effects of Herbicides Edivaldo D
Weed Science 2010 58:351–354 Growth Regulation and Other Secondary Effects of Herbicides Edivaldo D. Velini, Maria L. B. Trindade, Luis Rodrigo M. Barberis, and Stephen O. Duke* As all herbicides act on pathways or processes crucial to plants, in an inhibitory or stimulatory way, low doses of any herbicide might be used to beneficially modulate plant growth, development, or composition. Glyphosate, the most used herbicide in the world, is widely applied at low rates to ripen sugarcane. Low rates of glyphosate also can stimulate plant growth (this effect is called hormesis). When applied at recommended rates for weed control, glyphosate can inhibit rust diseases in glyphosate-resistant wheat and soybean. Fluridone blocks carotenoid biosynthesis by inhibition of phytoene desaturase and is effective in reducing the production of abscisic acid in drought-stressed plants. Among the acetolactate synthase inhibitors, sulfometuron-methyl is widely used to ripen sugarcane and imidazolinones can be used to suppress turf species growth. The application of protoporphyrinogen oxidase inhibitors can trigger plant defenses against pathogens. Glufosinate, a glutamine synthetase inhibitor, is also known to improve the control of plant diseases. Auxin agonists (i.e., dicamba and 2,4-D) are effective, low-cost plant growth regulators. Currently, auxin agonists are still used in tissue cultures to induce somatic embryogenesis and to control fruit ripening, to reduce drop of fruits, to enlarge fruit size, or to extend the harvest period in citrus orchards. At low doses, triazine herbicides stimulate growth through beneficial effects on nitrogen metabolism and through auxin-like effects. Thus, sublethal doses of several herbicides have applications other than weed control. -
On the Mechanism of Oligomer Formation in Condensations of Alkyl Cyanoacetates with Formaldehyde
Polymer Journal, Vol. 13, No. 10, pp 975-978 (1981) NOTE On the Mechanism of Oligomer Formation in Condensations of Alkyl Cyanoacetates with Formaldehyde J. M. ROONEY Loctite (Ireland) Limited, Whitestown Industrial Estate, Ta//aght, Co. Dublin. Ireland. (Received December II, 1980) KEY WORDS Alkyl Cyanoacetates I Formaldehyde / Condensation Anionic Polymerization I Cyanoacrylate I Chain Transfer I Industrial synthetic routes to the production of Since the apparent activation energy of the over alkyl cyanoacrylate monomers frequently involve all process was found to be similar to that of the base-catalyzed condensations of alkyl cyanoacetates condensation of diethyl dicyanoglutarate with for with formaldehyde to form low molecular weight maldehyde, the addition of diethyl dicyanoglutarate polymers. 1 Early studies attributed polymer for to formaldehyde is assumed to be the rate mation to a stepwise condensation2 of the form,3.4 determining step. CN CN I I CH2 + HCHO _..... CHCH20H I I COOR COOR CN CN CN CN I I I I CHCH2 0H + CH2 -----. CH-CH2-CH + H2 0 I I I I COOR COOR COOR COOR CN CN CN CN I I I I CH-CH2-CH + HCHO -----. CH-CH2-C-CH20H I I I I COOR COOR COOR COOR CN CN CN I I I CH-CH2-C-CH20H + CH2 etc. I I I COOR COOR COOR Subsequently, a kinetic study of the reaction of philic displacement of the hydroxyl group by cya formaldehyde with methyl cyanoacetate5 yielded noacetate anion. Instead, it is postulated that evidence that methyl cyanoacrylate monomer is an essential step in water evolution is the formation of intermediate in oligomer formation. -
Pre-Validation of an Acute Inhalation Toxicity Assay Using the Epiairway in Vitro Human Airway Model
Pre-Validation of an Acute Inhalation Toxicity Assay Using the EpiAirway In Vitro Human Airway Model George R. Jackson, Jr., Michelle Debatis, Anna G. Maione, Patrick J. Hayden Exposure to potentially dangerous chemicals can occur through inhalation. UNDERSTANDING HUMAN BIOLOGY IN DIMENSIONS3 2 Regulatory systems for classifying the acute inhalation toxicity of chemicals ≤ 0.05 mg/l > 0.05 ≤ 0.5 mg/l > 0.5 ≤ 2 mg/l > 2 mg/l Respirator Use Required 3 Regulatory systems for classifying the acute inhalation toxicity of chemicals 4 OECD 403/436 is the currently accepted test method for determining acute inhalation toxicity OECD Test Guidelines 403/436: In vivo rat LD50 test (dose at which 50% of the animals die) 4 hour exposure 14 Days Examination: - Death -Signs of toxicity -Necropsy should be performed (not always reported) Nose/Head only (preferred) Whole body Repeat stepwise with additional concentrations as necessary 5 Our goal is to develop & validate an in vitro test for acute inhalation toxicity UNDERSTANDING HUMAN BIOLOGY IN DIMENSIONS3 6 The EpiAirway Model EpiAirway is an in vitro 3D organotypic model of human tracheal/bronchial tissue. - Constructed from primary cells - Highly reproducible - Differentiated epithelium at the air-liquid interface - Beating cilia - Mucus secretion - Barrier function - Physiologically relevant & predictive of the human outcome Air Cilia Differentiated epithelium Microporous membrane Media 7 EpiAirwayTM acute inhalation toxicity test method Prepare 4-point dose Apply chemical to Incubate for 3 hours Examination: curve of chemical in the apical surface - Tissue viability (MTT) dH2O or corn oil Advantages of using the in vitro EpiAirway test: 1. -
South Umpqua Pilot Study 2014-19 Findings and Recommendations | Oregon Water Quality Management Team
South Umpqua Pilot Study 2014-19 Findings and Recommendations | Oregon Water Quality Management Team Background waters resulting from various types of land uses. The monitoring locations were chosen to represent the A pesticide water quality pilot study of the South predominant land use types existing within the various Umpqua subbasin (USGS 8-digit HUC 17100302)1 was watersheds as noted in the United States Geological initiated in the fall of 2014. The South Umpqua was Survey’s (USGS) 2016 National Land Cover Dataset. selected by the Water Quality Pesticide Management Initially, five monitoring locations were chosen. At Team (WQPMT) as one of four potential pilot projects the end of the spring 2015 sampling season two sites after the Pesticide Stewardship Partnership Program (Cow Creek at Mouth and Myrtle Creek at Mouth) received its first funding allocation from the Oregon were discontinued due to both the limited number of Legislature in 2013. The watersheds were selected pesticides detected and the low concentrations of those because of the multiple types of land uses in areas detections during the 2015 sampling period. In 2017 that use pesticides, the presence of municipal drinking two additional sites were added (Lookingglass Creek at water intakes, as well as existing water quality data the Happy Valley Bridge and the North of Myrtle Creek collected by DEQ and other entities. Within the South downstream of the Bilger Creek confluence) at the Umpqua subbasin, prospective local partners were suggestion of local partners (Table 1). contacted and expressed interest in participating in the pilot effort. Initial reconnaissance monitoring sites Based on the initial sampling results, the WQPMT were selected by a group comprised of state agencies approached the local stakeholder group about on the WQPMT, Partners for Umpqua Rivers (PUR), conducting a second phase of pilot monitoring in the Douglas Soil and Water Conservation District, Oregon South Umpqua 2017 which extended through the State University Extension, and the Cow Creek Band of spring of 2019. -
US EPA, Pesticide Product Label, DREXEL DUPLICATOR DUO,05/08
U.S. ENVIRONMENTAL PROTECTION AGENCY EPA Reg. Number: Date of Issuance: Office of Pesticide Programs Registration Division (7505P) 19713-699 5/8/18 1200 Pennsylvania Ave., N.W. Washington, D.C. 20460 NOTICE OF PESTICIDE: Term of Issuance: X Registration Reregistration Unconditional (under FIFRA, as amended) Name of Pesticide Product: Drexel Duplicator Duo Name and Address of Registrant (include ZIP Code): Luz Chan Registration Manager Drexel Chemical Company P.O. Box Note: Changes in labeling differing in substance from that accepted in connection with this registration must be submitted to and accepted by the Registration Division prior to use of the label in commerce. In any correspondence on this product always refer to the above EPA registration number. On the basis of information furnished by the registrant, the above named pesticide is hereby registered under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). Registration is in no way to be construed as an endorsement or recommendation of this product by the Agency. In order to protect health and the environment, the Administrator, on his motion, may at any time suspend or cancel the registration of a pesticide in accordance with the Act. The acceptance of any name in connection with the registration of a product under this Act is not to be construed as giving the registrant a right to exclusive use of the name or to its use if it has been covered by others. This product is unconditionally registered in accordance with FIFRA section 3(c)(5) provided that you: 1. Submit and/or cite all data required for registration/reregistration/registration review of your product when the Agency requires all registrants of similar products to submit such data. -
Reactions of Benzene & Its Derivatives
Organic Lecture Series ReactionsReactions ofof BenzeneBenzene && ItsIts DerivativesDerivatives Chapter 22 1 Organic Lecture Series Reactions of Benzene The most characteristic reaction of aromatic compounds is substitution at a ring carbon: Halogenation: FeCl3 H + Cl2 Cl + HCl Chlorobenzene Nitration: H2 SO4 HNO+ HNO3 2 + H2 O Nitrobenzene 2 Organic Lecture Series Reactions of Benzene Sulfonation: H 2 SO4 HSO+ SO3 3 H Benzenesulfonic acid Alkylation: AlX3 H + RX R + HX An alkylbenzene Acylation: O O AlX H + RCX 3 CR + HX An acylbenzene 3 Organic Lecture Series Carbon-Carbon Bond Formations: R RCl AlCl3 Arenes Alkylbenzenes 4 Organic Lecture Series Electrophilic Aromatic Substitution • Electrophilic aromatic substitution: a reaction in which a hydrogen atom of an aromatic ring is replaced by an electrophile H E + + + E + H • In this section: – several common types of electrophiles – how each is generated – the mechanism by which each replaces hydrogen 5 Organic Lecture Series EAS: General Mechanism • A general mechanism slow, rate + determining H Step 1: H + E+ E El e ctro - Resonance-stabilized phile cation intermediate + H fast Step 2: E + H+ E • Key question: What is the electrophile and how is it generated? 6 Organic Lecture Series + + 7 Organic Lecture Series Chlorination Step 1: formation of a chloronium ion Cl Cl + + - - Cl Cl+ Fe Cl Cl Cl Fe Cl Cl Fe Cl4 Cl Cl Chlorine Ferric chloride A molecular complex An ion pair (a Lewis (a Lewis with a positive charge containing a base) acid) on ch lorine ch loronium ion Step 2: attack of -
1997-11-12 Acrolein As Federal Hazardous Air Pollutant
ACROLEIN Acrolein is a federal hazardous air pollutant and was identified as a toxic air contaminant in April 1993 under AB 2728. CAS Registry Number: 107-02-8 H2C=CHCHO Molecular Formula: C3H4O Acrolein is a colorless or yellowish, flammable liquid with an unpleasant, extremely pungent odor. It is soluble in petroleum ether, water, and alcohol and miscible with hydrocarbons, acetone, and benzene (Sax, 1989). Acrolein polymerizes (especially in the presence of light, alkali, or strong acid) forming disacryl, a plastic solid (Merck, 1989). Physical Properties of Acrolein Synonyms: acraldehyde; allyl aldehyde; acrylic aldehyde; Biocide; 2-propenal Molecular Weight: 56.06 Boiling Point: 52.5 oC Melting Point: -88.0 oC Flash Point: -18 oC (< 0 oF) (open cup) Vapor Density: 1.94 (air = 1) Vapor Pressure: 210 mm Hg at 20 oC Density/Specific Gravity: 0.8389 at 20/4 oC Log Octanol/Water Partition Coefficient: -0.09 Water Solubility: 208,000 mg/L at 20 oC Henry's Law Constant: 4.4 x 10-6 atm-m3/mole Conversion Factor: 1 ppm = 2.29 mg/m3 (Howard, 1990; HSDB, 1991; Merck, 1989; U.S. EPA, 1994a) SOURCES AND EMISSIONS A. Sources Acrolein is emitted from sources where it is manufactured and used as an intermediate for glycerine, methionine, glutaraldehyde, and other organic chemicals. It is also found in tobacco smoke, forest fire emissions, and gasoline and diesel exhaust. Acrolein is also a photooxidation product of various hydrocarbons including 1,3-butadiene (Howard, 1990). Toxic Air Contaminant Identification List Summaries - ARB/SSD/SES September 1997 23 Acrolein The primary stationary sources that have reported emissions of acrolein in California are paper mills, and abrasive, asbestos, miscellaneous non-metallic mineral, and wood products (ARB, 1997b). -
Acetophenone Sigma Aldrich.Pdf
SIGMA-ALDRICH sigma-aldrich.com Material Safety Data Sheet Version 4.0 Revision Date 02/27/2010 Print Date 07/08/2011 1. PRODUCT AND COMPANY IDENTIFICATION Product name : Acetophenone Product Number : A10701 Brand : Sigma-Aldrich Company : Sigma-Aldrich 3050 Spruce Street SAINT LOUIS MO 63103 USA Telephone : +1 800-325-5832 Fax : +1 800-325-5052 Emergency Phone # : (314) 776-6555 2. HAZARDS IDENTIFICATION Emergency Overview OSHA Hazards Combustible Liquid, Harmful by ingestion., Irritant GHS Label elements, including precautionary statements Pictogram Signal word Danger Hazard statement(s) H227 Combustible liquid H302 Harmful if swallowed. H318 Causes serious eye damage. Precautionary statement(s) P210 Keep away from heat/sparks/open flames/hot surfaces. - No smoking. P264 Wash skin thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P280 Wear protective gloves/protective clothing/eye protection/face protection. P301 + P312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell. P305 + P351 + P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P310 Immediately call a POISON CENTER or doctor/physician. P330 Rinse mouth. P370 + P378 In case of fire: Use dry sand, dry chemical or alcohol-resistant foam for extinction. P403 + P235 Store in a well-ventilated place. Keep cool. P501 Dispose of contents/container to an approved waste disposal plant. HMIS Classification Health hazard: 2 Flammability: 2 Physical hazards: 0 NFPA Rating Health hazard: 2 Fire: 2 Reactivity Hazard: 0 Potential Health Effects Sigma-Aldrich - A10701 Page 1 of 6 Inhalation May be harmful if inhaled. -
The Asymmetric Synthesis of Styrene-Oxide and Its Reactions with Dialkylmagnesium Reagents and Boron Hydrides
University of New Hampshire University of New Hampshire Scholars' Repository Doctoral Dissertations Student Scholarship Summer 1971 THE ASYMMETRIC SYNTHESIS OF STYRENE-OXIDE AND ITS REACTIONS WITH DIALKYLMAGNESIUM REAGENTS AND BORON HYDRIDES RONALD LEROY ATKINS Follow this and additional works at: https://scholars.unh.edu/dissertation Recommended Citation ATKINS, RONALD LEROY, "THE ASYMMETRIC SYNTHESIS OF STYRENE-OXIDE AND ITS REACTIONS WITH DIALKYLMAGNESIUM REAGENTS AND BORON HYDRIDES" (1971). Doctoral Dissertations. 964. https://scholars.unh.edu/dissertation/964 This Dissertation is brought to you for free and open access by the Student Scholarship at University of New Hampshire Scholars' Repository. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of University of New Hampshire Scholars' Repository. For more information, please contact [email protected]. 72-3736 ATKINS, Ronald Leroy, 1939- THE ASYMMETRIC SYNTHESIS OF STYRENE OXIDE AND ITS REACTIONS WITH DIALKYLMAGNESIUM REAGENTS AND BORON HYDRIDES. University of New Hampshire, Ph.D., 1971 Chemistry, organic University Microfilms, A XEROX Company, Ann Arbor, Michigan © 1971 Ronald LeRoy Atkina ALL RIGHTS RESERVED THE ASYMMETRIC SYNTHESIS OF STYRENE OXIDE AND ITS REACTIONS WITH DIALKYLMAGNESIUM REAGENTS AND BORON HYDRIDES by RONALD L. ATKINS B. S., The University of Wyoming, 1966 M. S., The University of Wyoming, 1968 A THESIS Submitted to the University of New Hampshire In Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Graduate School Department of Chemistry August, 1971 This thesis has been examined and approved. f b w < M & > YUffvyido— The^js Director, James D. Morrison Asspaiate Professor of Chemistry & L DJitdsh-iU. _____ Colin D. -
Supplement of Reactive Organic Carbon Emissions from Volatile Chemical Products
Supplement of Atmos. Chem. Phys., 21, 5079–5100, 2021 https://doi.org/10.5194/acp-21-5079-2021-supplement © Author(s) 2021. CC BY 4.0 License. Supplement of Reactive organic carbon emissions from volatile chemical products Karl M. Seltzer et al. Correspondence to: Havala Pye ([email protected]) The copyright of individual parts of the supplement might differ from the article licence. 15 Table S1: PUCs, sub-PUCs, NAICS codes, and SCTG codes for all sub-PUCs. Product Use Sub-Product Use SCTG NAICS Product Codesa Producer Price Index Categoryc Categories (PUCs) Categories (sub-PUCs) Codeb 3256111, 3256114, 3256117, Soap and Other Detergent Detergents & Soaps 233 325611W Manufacturing Polish and Other Sanitation Good Manufacturing; Cleaning Products 3256125, 2356127, 2356121, Soap and Other Detergent General Cleaners 233 235611A, 2356130, 325612W Manufacturing; Surface Active Agent Manufacturing; 3256204, 325620D, 325620G, Daily Use Products 232 Toilet Preparation Manufacturing 325620W, 3256207 (25%)d Personal Care Toilet Preparation Manufacturing; Products 3256201, 325620A, 325611D, Short Use Products 232 Soap and Other Detergent 3256207 (75%)d Manufacturing 3255201, 3255204, 3255207, Adhesives & Sealants Adhesives & Sealants 239 Adhesive Manufacturing 305520A, 325520W Architectural Coatings 3255101, 325510W f Paint and Coating Manufacturing Aerosol Coatings 3255107 (10%)e f Paint and Coating Manufacturing Paints & Coatings Allied Paint Products 325510B f Paint and Coating Manufacturing 3255104, Industrial Coatings f Paint and Coating Manufacturing 3255107 (90%)e 3259101, 3259104, 3259107, Printing Inks Printing Inks 325910A, 325910E, 325910H, 231 Printing Ink Manufacturing 325910W Pesticide and Other Agricultural FIFRA Pesticides 3253204, 3253207 235 Chemical Manufacturing Pesticides & FIFRA All Other Basic Organic Chemical Products Manufacturing; Pesticide and Other Agricultural Pesticides 3251994, 3253201, 325320W 235 Agricultural Chemical Manufacturing Dry Cleaning Dry Cleaning g Oil & Gas Oil & Gas Misc. -
ACETOPHENONE Method No. PV2003 Target Concentration
ACETOPHENONE Method no. PV2003 Target concentration: 100 ppm (491 mg/m3) Procedure: Samples are collected by drawing a known volume of air through a Tenax GC tube. Samples are desorbed with a solvent mixture of (5:95) Isopropanol:Carbon Disulfide (IPA):(CS2) and analyzed by gas chromatography with a flame ionization detector. Recommended air volume 120 minutes at 0.1 L/min (12 L) and sampling rate: Status of Method: Partially Validated. This method has been only partially evaluated and is presented for information and trial use. July 1982 Wayne Potter Service Branch 1 OSHA Salt Lake Technical Center Salt Lake City UT-84115 1 of 8 1 General Discussion 1.1 Background 1.1.1 History of procedure Recently, the OSHA Analytical Laboratory received a set of field samples that required analysis for acetophenone. The air samples had been collected on charcoal tubes and isopropanol impingers. Desorption studies were done on charcoal tubes using acetone, carbon disulfide, 5:95 isopropanol:carbon disulfide, and methylene chloride as desorbing solvents. The best results were obtained with 5:95 isopropanol:carbon disulfide, but the recovery was only 68%, which indicated that charcoal tubes should not be recommended for the collection of acetophenone air samples. An evaluation of isopropanol impingers was not performed because it was preferable to find an adsorbent procedure for sample collection. NIOSH method 291 for α -chloroacetophenone uses Tenax GC tubes. The Tenax GC tubes were tried for acetophenone, and appeared to be a suitable method of collection. 1.1.2 Toxic effects (This section is for information only and should not be taken as the basis of OSHA policy.) Acetophenone is a narcotic in high concentrations (Ref. -
(12) United States Patent (10) Patent No.: US 7.449,439 B2 to Et Al
USOO7449439B2 (12) United States Patent (10) Patent No.: US 7.449,439 B2 to et al. (45) Date of Patent: Nov. 11, 2008 (54) WATER-SOLUBLE THICKENER AND LIQUID (56) References Cited ACDIC DETERGENT U.S. PATENT DOCUMENTS (75) Inventors: Kenji Ito, Aichi (JP); Yoshio Mori, 3,768,565 A 10, 1973 Persinski et al. Aichi (JP) (Continued) (73) Assignee: Toagosei Co., Ltd., Tokyo (JP) FOREIGN PATENT DOCUMENTS (*) Notice: Subject to any disclaimer, the term of this JP 53-463O2 A 4f1978 patent is extended or adjusted under 35 U.S.C. 154(b) by 455 days. (Continued) (21) Appl. No.: 10/530,179 OTHER PUBLICATIONS International Search Report PCT/JP2003/012764 dated Dec. 9, 2003. (22) PCT Filed: Oct. 6, 2003 (Continued) (86). PCT No.: PCT/UP03/12764 Primary Examiner Brian PMruk S371 (c)(1), (74) Attorney, Agent, or Firm Sughrue Mion, PLLC (2), (4) Date: Apr. 4, 2005 (57) ABSTRACT (87) PCT Pub. No.: WO2004/031314 A water-soluble thickener which is highly effective even in PCT Pub. Date: Apr. 15, 2004 thickening strongly acidic aqueous Solutions and has excel lent stability in such solutions. It comprises a water-soluble (65) Prior Publication Data copolymer having a weight-average molecular weight of 6,000,000 or higher obtainable by polymerizing a monomer US 2006/OO46949 A1 Mar. 2, 2006 mixture which comprises 2-acrylamido-2-methylpropane (30) Foreign Application Priority Data Sulfonic acid and/or a salt thereofandacrylic acid and/or a salt thereofas essential components and optionally one or more Oct. 4, 2002 (JP) ............................. 2002-292975 other copolymerizable monomer components including the Oct.