DOCSLIB.ORG

Towards the Efficient Utilization of Geothermal Resources

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Towards the Efficient Utilization of Geothermal Resources 313 14th New Zealand Geothermal Workshop 1992 TOWARDS THE EFFICIENT UTILIZATION OF GEOTHERMAL RESOURCES R. T. Harper and A. Thain Consultant, Tasman Pulp & Paper Ltd. Manager, Wairakei Geothermal Area, Electricorp - Separated geothermal water from production wells at Wairakei, Ohaaki, Kawerau, Ngawha and other less developed fields in New Zealand, contains potentially valuable chemical constituents. In particular, the extraction of precipitated amorphous silica is discussed in terms of its strategic and beneficial value to expanded energy generation in geothermal development, removal of environmentally sensitive constituents and as a marketable commodity in its own right. The prospect of recovering other minerals thereby the full potential of geothermal resources is considered. Expectations regarding high temperature reinjection could be reviewed in consideration of alternative opportunities which have been advanced in recent years. 1.0 INTRODUCTION proceeding with high temperature reinjection of part of the total separated water flow from Wairakei in an The opportunities to better utilize New Zealand's attempt to reduce the impact of geothermal water flow geothermal resources, which contribute significantly to to the Waikato river. Implementation of a reinjection the nation's wealth are addressed in this paper. The scheme at Wairakei or elsewhere, pre-empts to a degree, developments discussed here, represent a potential the options of recovering minerals and extracting further benefit to geothermal resource owners and operators, energy. Reinjection also involves a considerable capital the community and end users of minerals which are investment. The technologies believed important to the identified as being of commercial value. To date, processing of large water streams have advanced chemical processing of geothermal water has not significantly over recent years and have prompted received much attention and engineering solutions have reconsideration of the expectations of reinjection a been provided to treat separated water. However, development strategy for the future development of chemical processing would enable a valuable synergy to geothermal resources. be obtained between geothermal power operation and protection of some natural waterways from separated 2.0 MINERAL RECOVERY geothermal water. The opportunities are considered to fall into three categories: 2.1 Mineral Content of Geothermal Fluids at Wairakei, Ohaaki, Kawerau and Ngawha. Recovery. Acceptable return of water to the environment. Table 1 and figure 1 show the principal chemical iii) Recovery. constituent concentrations contained and minerals and elements recoverable from separated geothermal water Established geothermal developments still involve a for Wairakei, Ohaaki, Kawerau and Ngawha production thermally inefficient process. Rejection temperatures for wells. separated water at Wairakei,. Ohaaki and Kawerau are 155°C and 172°C respectively. In exploited water The net worth of these minerals is substantially less dominated geothermal resources, reject temperatures for than that indicated by the gross value. However, the separated water remain high to minimize a significant gross revenues roughly indicate the level of capital and operating constraint with respect to amorphous silica operating costs which could be tolerated in each case. deposition. Estimates of the recoverable quantities of respective minerals were based on the following water from Other chemical constituents of geothermal water make each field: treatment of it, a responsible task. For example, arsenic and by some parties is considered to be an i) Wairakei 30 million tonnes. environmentally . sensitive constituent of separated ii) Ohaaki 9 million tonnes. geothermal water. With existing technology, responsible iii) Kawerau 7 million tonnes. management of separated geothermal water usually iv) Ngawha 10 million tonnes involves reinjection. For example, Electricorp are 314 Table 1. Potential Quantity and Value of Minerals from N.Z. Geothermal Water. --- silica ---- Lithium - -- Arsenic Trioxide Boric Acid __----.--- silica Lithium . Arsenic Trioxide Boric Acid silica Lithium. .. Arsenic .Trioxide.- Boric Acid Lithium -- Arsenic Trioxide Boric Acid The potential commercial value of these minerals based on quoted prices in the Chemical Marketing 80 Reporter (1991) and market research conducted separately by Electricorp and Victoria University. lithium 2.2 Recoverable Products. arsenic A considerable amount of work has been carried out 60 boric-ac on the treatment of geothermal brines for the recovery of certain minerals, both in New Zealand and overseas (Buisson et. al., 1979; Crane, 1982; Mercado et. Recepoglu Beker, 1991; Rothbaum Anderton, 1975; Rothbaum Buisson, 1977; Rothbaum Middendorf, Thordarson et. al., 1987.). However, much of this' research and development focused on the removal of environmentally sensitive constituents with little effort being directed towards marketable products. The following discussion identifies some of the recoverable products and their market 20 potential. Amorphous Silica Nearly all energy extraction processes result in geothermal water becoming supersaturated with and 0 depositing amorphous silica. The amorphous silica WAIRAKEI KAWERAU deposits in pipework, channels, pumps (where these are OHAAKI used), reinjection well casings and reservoir formation. It may take the form of a dense, vitreous deposit or have a lower bulk density, friable character. Whatever form these natural deposits take, investigations have Figure Estimated Gross Value per annum of shown that the silica does not have suitable physical and Minerals from N.Z. Geothermal Fields dependent chemical characteristics to be of significant on the removal of silica. value. When a newly formed supersaturated silica solution allowed to stand the dissolved monomeric 315 silica polymerizes to form colloidal silica particles which anticipated that the newsprint and filled grade paper can be further aggregated to form a precipitate. The industries could consume the total output of precipitation process can be controlled to produce precipitated silica from the Wairakei and Kawerau silicas with varying physical and chemical qualities which geothermal fields. do have commercial significance. Precipitated silicas are an internationally traded commodity and industries The extraction of amorphous silica is strategic to the which consume these products include; rubber, plastics, full utilization of geothermal resources. Silica removal paper, paint, cement, ceramics, pharmaceuticals, is considered a necessary process prior to downstream pesticides and adhesives. A vast array of precipitated chemical processing and reinjection of lower and other silicas are commercially manufactured from temperature geothermal water. It therefore paves the synthetic sources to suit these applications. The New way for expanded energy extraction, reliable long term, Zealand situation demands that a concerted effort be low temperature reinjection and possibly safe made towards research with a specific end use in mind. environmental disposal to natural waterways. In some It is considered that commercialization of the silica cases the treated geothermal water may become a useful extraction process will require manufacture of a industrial water source, thereby reducing the demand on moderately valued precipitated silica which satisfies an surface water. The scale of the silica pilot plant built by application having a reasonably high demand. On this Tasman Pulp Paper Ltd. brings the basis, a long term supply contract can be established commercialization of silica extraction a step closer and with the end user, from which revenue can support the the beneficial implications such an endeavour has for development of alternative forms of silica, if the need geothermal development can not be overemphasized. A arises. commercial precipitated silica process must take into consideration the needs of an integrated geothermal Research into amorphous silica extraction from development. It should therefore be able to receive geothermal water in New Zealand has been conducted water from conventional separator or binary cycle over several years. DSIR (Rothbaum Anderton, 1975; installations. Further, geothermal water which has been Shannon et. al., 1982) have developed laboratory and processed by a silica extraction plant should be of small field test rigs to extract arsenic and calcium rich acceptable quality €or low temperature reinjection, or precipitated silica with the objective of rendering water surface disposal. benign for environmental disposal. For a variety of reasons none of these developments were accepted as Lithium having commercial significance. It is understood that DSIR have conducted work on a potentially commercial The technology to extract lithium from various water type of silica which has low concentrations of adsorbed sources exists and in situations where brine lithium arsenic; an attractive characteristic in some applications. concentrations are sufficiently concentrated, is considered economic, (Crozier, 1986). Lithium extraction A significant, coordinated research effort by Tasman has been attempted (Yanagase et. al., 1983) from Pulp Paper Ltd., and Victoria University has geothermal water and various methods were reviewed by resulted in a commercial prototype pilot plant being Rothbaum and Middendorf (1986). latter review built to extract several grades of silica which have mentioned the use of membrane impregnated
Load more

Recommended publications
  • Ri Wkh% Lrorjlfdo (Iihfwv Ri 6Hohfwhg &Rqvwlwxhqwv
    Guidelines for Interpretation of the Biological Effects of Selected Constituents in Biota, Water, and Sediment November 1998 NIATIONAL RRIGATION WQATER UALITY P ROGRAM INFORMATION REPORT No. 3 United States Department of the Interior Bureau of Reclamation Fish and Wildlife Service Geological Survey Bureau of Indian Affairs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ntroduction The guidelines, criteria, and other information in The Limitations of This Volume this volume were originally compiled for use by personnel conducting studies for the It is important to note five limitations on the Department of the Interior's National Irrigation material presented here: Water Quality Program (NIWQP). The purpose of these studies is to identify and address (1) Out of the hundreds of substances known irrigation-induced water quality and to affect wetlands and water bodies, this contamination problems associated with any of volume focuses on only nine constituents or the Department's water projects in the Western properties commonly identified during States. When NIWQP scientists submit NIWQP studies in the Western United samples of water, soil, sediment, eggs, or animal States—salinity, DDT, and the trace tissue for chemical analysis, they face a elements arsenic, boron, copper, mercury, challenge in determining the sig-nificance of the molybdenum, selenium, and zinc.
    [Show full text]
  • Carpenter Ants and Control in Homes Page 1 of 6
    Carpenter Ants and Control in Homes Page 1 of 6 Carpenter Ants and Control in Homes Fact Sheet No. 31 Revised May 2000 Dr. Jay B Karren, Extension Entomologist Alan H. Roe, Insect Diagnostician Introduction Carpenter ants are members of the insect order Hymenoptera, which includes bees, wasps, sawflies, and other ants. Carpenter ants can be occasional pests in the home and are noted particularly for the damage they can cause when nesting in wood. In Utah they are more of a nuisance rather than a major structural pest. Carpenter ants, along with a number of other ant species, utilize cavities in wood, particularly stumps and logs in decayed condition, as nesting sites. They are most abundant in forests and can be easily found under loose bark of dead trees, stumps, or fallen logs. Homeowners may bring them into their homes when they transport infested logs from forests to use as firewood. Description Carpenter ants include species that are among the largest ants found in the United States. They are social insects with a complex and well-defined caste system. The worker ants are sterile females and may occur in different sizes (majors and minors). Members of the reproductive caste (fertile males and females) are usually winged prior to mating. All ants develop from eggs deposited by a fertilized female (queen). The eggs hatch into grub-like larvae (immatures) which are fed and cared for by the workers. When fully grown, the larvae spin a cocoon and enter the pupal stage. The pupal stage is a period of transformation from the larva to adult.
    [Show full text]
  • Opinion & Information on Boric Acid
    Opinion & Information on Boric Acid By Michael R. Cartwright, Sr. (Michael R. Cartwright, Sr. is a third generation licensed professional in the fields of structural pest control and building construction and is also licensed in agriculture pest control. His qualifications are too extensive to print but are available on request from The Reporter.) Over the past years I have seen, in many homes and restaurants, boric acid covering everything. Carpets, floors, toys and furniture, in kitchen cabinets, on counter tops and tables, in refrigerators, clothing, etc. Why? Because environmentalists, helped by an uninformed news media, tell them to. Why don't the news media also explain the possible dangers of applying something not normally found in the home environment, that you or your animals will come in direct contact with? I'm writing this article even though a California environmentalist group advised me not to say anything against boric acid and that I would pay dearly for only trying to mislead the public. My company uses a lot of boric acid, but not as described above. Under an OSHA Hazard Communication Standard, based on animal chronic toxicity studies of inorganic borate chemicals, boric acid and/or borates are Hazardous Materials. California has identified boric acid as a hazardous waste. The above information is taken from Material Safety Data Sheet (MSDS) 25-80-2320 (Section 2 and 13) supplied by U.S. Borax Inc. (the major supplier of borax to many industries). The National Academy of Sciences reports that children may be uniquely sensitive to chemicals and pesticide residues because of their rapid tissue growth and development.
    [Show full text]
  • PLEASE CHECK for LATEST PART INFORMATION 0386006603 Active
    This document was generated on 07/30/2021 PLEASE CHECK WWW.MOLEX.COM FOR LATEST PART INFORMATION Part Number: 0386006603 Status: Active Overview: Beau Barrier Strips Description: 6.35mm Pitch Beau PCB Tri-Barrier Terminal Strip, without Mounting Ends, 300V, 3 Circuits Documents: 3D Model 3D Model (PDF) Drawing (PDF) RoHS Certificate of Compliance (PDF) General Series image - Reference only Product Family Terminal Blocks Series 38600 EU ELV Application N/A Not Relevant Component Type One Piece Overview Beau Barrier Strips EU RoHS China RoHS Product Name Fixed Mount Barrier Compliant Type Barrier Strip REACH SVHC UPC 800756242606 Contained Per - D(2020)4578-DC (25 Physical June 2020) Circuits (Loaded) 3 henicosafluoroundecanoic Circuits (maximum) 3 acid Color - Resin Black disodium 4- Entry Angle Horizontal amino-3-[[4'-[(2,4- Lock to Mating Part None diaminophenyl)azo] Material - Metal Brass chromium trioxide Material - Plating Mating Tin 1,3-propanesultone Material - Plating Termination Tin 1-vinylimidazole Material - Resin Polyester Alloy 4,4'-methylenedi-o- Number of Rows 1 toluidine Orientation Horizontal dibutyltin dichloride PC Tail Length 5.10mm methoxyacetic acid PCB Thickness - Recommended 3.18mm 1,2- Panel Mount No Benzenedicarboxylic Pitch - Mating Interface 6.35mm acid, bis(3- Pitch - Termination Interface 6.35mm methylbutyl) Polarized to Mating Part No disodium 3,3'-[[1,1'- Shrouded Tri-Barrier biphenyl]-4,4'- Stackable No diylbis(azo) Surface Mount Compatible (SMC) No octamethylcyclotetrasiloxane Temperature Range - Operating
    [Show full text]
  • Transfer of Ingested Insecticides Among Cockroaches: Effects of Active Ingredient, Bait Formulation, and Assay Procedures
    HOUSEHOLD AND STRUCTURAL INSECTS Transfer of Ingested Insecticides Among Cockroaches: Effects of Active Ingredient, Bait Formulation, and Assay Procedures 1 2 1, 3 GRZEGORZ BUCZKOWSKI, ROBERT J. KOPANIC, JR., AND COBY SCHAL J. Econ. Entomol. 94(5): 1229Ð1236(2001) ABSTRACT Foraging cockroaches ingest insecticide baits, translocate them, and can cause mor- tality in untreated cockroaches that contact the foragers or ingest their excretions. Translocation of eight ingested baits by adult male Blattella germanica (L.) was examined in relation to the type of the active ingredient, formulation, and foraging area. Ingested boric acid, chlorpyrifos, Þpronil, and hydramethylnon that were excreted by adults in small dishes killed 100% of Þrst instars within 10 d and Ͼ50% of second instars within 14 d. Residues from these ingested baits were also highly effective on nymphs in larger arenas and killed 16Ð100% of the adults. However, when the baits and dead cockroaches were removed from the large arenas and replaced with new cockroaches, only residues of the slow-acting hydramethylnon killed most of the nymphs and adults, whereas residues of fast acting insecticides (chlorpyrifos and Þpronil) killed fewer nymphs and adults. Excretions from cockroaches that ingested abamectin baits failed to cause signiÞcant mortality in cockroaches that contacted the residues. These results suggest that hydramethylnon is highly effective in these assays because cockroaches that feed on the bait have ample time to return to their shelter and defecate insecticide-laden feces. The relatively high concentration of hydramethylnon in the bait (2.15%) and its apparent stability in the digestive tract and feces probably contribute to the efÞcacy of hydra- methylnon.
    [Show full text]
  • Chronology of Pesticides Used on National Park Service Collections
    Conserve O Gram June 2001 Number 2/16 Chronology Of Pesticides Used On National Park Service Collections The history of National Park Service pesticide use publication). Synonyms and trade names were policy for museum collection objects is obtained from the Merck Index, notes from the documented in various publications including IPM Coordinator, and two Internet sites Field Manual for Museums (Burns), Manual for (<http://chemfinder.com> and <http:// Museums (Lewis), versions of the Museum www.cdpr.ca.gov/cgi-bin/epa>). Handbook, Part I, and two versions of the Integrated Pest Management Information Manual. Not all of the chemicals listed in the Other non-policy sources include Coleman's accompanying charts were marketed as pesticides. Manual for Small Museums, object treatment Some are fungicides and microbiocides. One, reports and notes from NPS staff, and notes from Lexol, is a leather preservative and consolidant. the Office of the Integrated Pest Management All of these are included here because records (IPM) Coordinator. indicate they were applied to objects as pesticides. The two accompanying charts list the types of The potential for pesticide residue remaining on pesticides that may have been used on National collection objects is very high. Objects with such Park Service collections along with some common residues pose a health risk to curatorial staff and synonyms and trade names. to the public who come into physical contact with them, unless proper precautions are taken. Dates shown in blue on the chart represent Additional information on health and safety issues published recommendations for the use of and protective measures can be found in the pesticides.
    [Show full text]
  • Household Insects – Homeowners ` CAUTION: All Insecticides Are Toxic to Some Degree; Therefore, Care Should Be Exercised in Their Use
    Household Insects – Homeowners ` CAUTION: All insecticides are toxic to some degree; therefore, care should be exercised in their use. The manufacturer’s directions on the label in the use of the material must be followed explicitly. Insect Threats Insecticides and Treatment* Remarks Ants Feed on foods and Baits (active ingredient and Remove food and clean up the area. Place (several may damage product): bait where ants occur or congregate. May species) clothing; may also sodium tetraborate decahydrate use several different baits at the same time sting, causing severe (Amdro Kills Ants Liquid Bait, Terro to discover one that ants will consume. reaction to some Liquid Ant Baits); Care should be taken not to contaminate people. hydramethylnon (Amdro Kills Ants foodstuffs. Also treat nests in yard. Follow Bait Stations and Stakes); label. orthoboric acid (Terro Perimeter Ant Bait); fipronil (Combat Max Ant Killing Bait Stations and Gel); abamectin (Raid Max Double Control Ant Baits, Raid Ant Baits III); dinotefuran (Hot Shot Ultra Clear Roach & Ant Gel Bait, Hot Shot Ultra Liquid Ant Bait); spinosad (Ortho Home Defense Liquid Ant Bait); thiamethoxam (Raid Precision Placement Ant Bait Gel) Crack and crevices: Follow label. prallethrin, esfenvalerate, pyrethrins, pyrethrum, permethrin, tetra- methrin, phenothrin, beta-cyfluthrin, cyfluthrin Indoor space: prallethrin, esfenvalerate, pyrethrins, pyrethrum, permethrin, tetramethrin, phenothrin, cyfluthrin, bifenthrin Outdoor barrier: prallethrin, esfenvalerate, permethrin, beta-cyfluthrin, cyfluthrin, bifenthrin, malathion, carbaryl Outdoor broadcast: hydramethylnon, pyriproxyfen, beta-cyfluthrin, esfenvalerate, bifenthrin, cyfluthrin, malathion, carbaryl *Labels on insecticides should state “material may be used in the household” and should be registered by the EPA for that purpose. Household Insects – Homeowners ` CAUTION: All insecticides are toxic to some degree; therefore, care should be exercised in their use.
    [Show full text]
  • Glues POISONS Boric Acid Grease Ant and Roach Killer Car Battery
    COMMON HOUSEHOLD HAZARDOUS WASTES CORROSIVES (ACIDS) Glues POISONS Boric Acid Grease Ant and Roach Killer Car Battery Acid Household Waxes Arsinic Compounds Copper Cleaners Isopropyl Alcohol Automotive Cleaners Etching Solutions Kerosene Bacterial Pipe Cleaners Ferric Chloride Lacquer Thiner Bordeaux Mix Hydrochloric Acid Lacquer Paint (unsolidified) Boric Acid Hydrofluoric Acid Linseed Oil Bug Removers Metal Cleaners Liquid Waxes Chlordane Muriatic Acid Liquid Sandpaper Chromium Navel Jelly Liquid Butane Copper Sulfate Phosphoric Acid Methanol DDT Pool Acid Naphtha Diazinon Sodium Bisulfate Oils (petroleum) Dimethylamine Salts Sulfuric Acid Organic Solvents Disinfectants Toilet Bowl Cleaners Paint Thinners Dog Repellent Paint Strippers Fertilizers CORROSIVES (BASES) Paraffin Oil Flea Spray/Powders Ammonia Perfume Fluorine Ammonia Based Cleaners Petroleum Distillers Fungicides Battery Terminal Cleaners Plastic Roof Cement Gopher Killer Caustic Soda Plastic Model Cement Hydrofluoric Acid Cess Pool Cleaners Polyurethane Paint (unsolidified) Insect Sprays Drain Cleaners Polyurethane Cement (unsolid.) Lead Compounds Household Cleaners Powe Steering Fluid Lice Powders Lime Primers Lindane Lye Roofing Cement Malathion Oven Cleaners Rug/Upholstery Cleaner Methylene Chloride Sodium Hydroxide Sealers Mole Killer Window Cleaners Shellac Thinner Moth Crystals Silicone Sprays Pesticides FLAMMABLES & COMBUSTIBLES Spot Remover/Dry Clean Fluids Pharmaceuticals Acetone Thinner Plant Food Adhesives Tile Cement Pruning Paint Aerosol Tire Black Pyethrins
    [Show full text]
  • On Chickpea with Controlled Droplet' Application of Nuclear Polyhedrosis Virus in Combination with Endosulfan and Boric Acid
    J. Bioi. Control, 1 (2), 122-125, 1987' Control of Heliothis armige~ (Hbn.) on Chickpea with Controlled Droplet' Application of Nuclear Polyhedrosis Virus in Combination with Endosulfan and Boric Acid R. J. RABINDRA and S. JAYARAJ Centre for Plant Protection Studies Tamil Nadu Agricultural University. Coimbatore 641003 ABSTRACT Results of a laboratory experiment showed that boric acid 1 % or magnesium sulphate at 0.5 and 1.0 % increased the mortality of second instar larvae of Heliothis armigera (Hbn.) due to nuclear polyhedrosis virus. In the field experi­ ment with chickpea cv. Shoba, application of NPV @ 250 LE + boric acid 125 g/ha significantly redu~ed the larval population over application of NPV alone. Addition of endosulfan 175 g a.L/ha to a mixture of NPV 125 LE + boric acid 125 g/ha was significantly more effective than application of NPV + boric acid in controlling H. armigera larvae. However, a combination of NPV 250 lE + endosulfan 175 g a.i./ha was the most effective in controlling the pest and increasing the yield. Key Words: Nuclear polyhedrosis virus, boric acid, MgS04, ZnS04, endosulfan, Heliothis armigera, contro', ULV, chickpea Successfu I control of the gram ULV application of NPV in combina­ caterpillar Heliothls armigera (Hbn.) tion with boric acid and endosulfan with controlled droplet application for the control of H. armigera on (COA) of nuclear polyhedrosis virus chickpea. (NPV) in' 20% crude sugar (jaggery) was demonstrated by Rabindra and MATERIALS AND METHODS Jayaraj (1986). Application of N PV A laboratory bio-assay was con­ with half the recommended dose of ducted Jo evaluate the efficacy of boric endosulfan had also given good control acid, MgS04 and ZnSo4 in increasing of H.
    [Show full text]
  • Proposing Boric Acid As an Antidote for Aluminium Phosphide Poisoning by Investigation of the Chemical Reaction Between Boric Acid and Phosphine
    Journal of Medical Hypotheses and Ideas (2013) 7, 21–24 Available online at www.sciencedirect.com Journal of Medical Hypotheses and Ideas journal homepage: www.elsevier.com/locate/jmhi REGULAR ARTICLES Proposing boric acid as an antidote for aluminium phosphide poisoning by investigation of the chemical reaction between boric acid and phosphine Motahareh Soltani a, Seyed Farid Shetab-Boushehri b, Hamidreza Mohammadi c, Seyed Vahid Shetab-Boushehri d,* a Department of Toxicology, Ahar Branch, Islamic Azad University, Ahar, Iran b Novin Kavosh Mamatir, 20th Street, Kaveh Industrial Zone, Saveh, Iran c Department of Clinical Toxicology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran d Department of Clinical Toxicology, School of Medicine and Razi Drug Research Center, Tehran University of Medical Sciences, P.O. Box: 14155-5983, Tehran, Iran Received 5 November 2012; revised 27 November 2012; accepted 28 November 2012 KEYWORDS Abstract Aluminium phosphide (AlP) is a storage fumigant pesticide, which is used to protect Aluminium phosphide stored grains especially from insects and rodents. It releases phosphine (PH3) gas, a highly toxic poisoning; mitochondrial poison, in contact with moisture, particularly if acidic. Although the exact mecha- Phosphine gas; nism of action is unknown so far, the major mechanism of PH3 toxicity seems to be the inhibition Trapping agent; of cytochrome-c oxidase and oxidative phosphorylation which eventually results in adenosine tri- Antidote; phosphate (ATP) depletion and cell death. Death due to AlP poisoning seems to be as a result Boric acid of myocardial damage. No efficient antidote has been found for AlP poisoning so far, and unfor- tunately, most of the poisoned human cases die.
    [Show full text]
  • United States Patent Office Patented Aug
    3,684,666 United States Patent Office Patented Aug. 15, 1972 2 copper coating from both of these baths. Consequently, 3,684,666 COPPERELECTROPLATING IN A although the use of cyanide may be reduced, it has not CTRIC ACHD BATH been eliminated. John K. Shaw, Huntington, N.Y., and John B. Romolo, Prior art methods of electrodepositing copper on a West Roxbury, and Charles Levy, Newton, Mass. (all 5 metallic substrate have utilized citric acid, or a salt there % Chas. Pfizer & Co., Inc., 235 E. 42nd St., New of, as an additive to copper electroplating solutions to York, N.Y. 10017) increase the permissible cathode current density range; to No Drawing. Filed Mar. 19, 1970, Ser. No. 21,216 increase the conductivity of the bath; to increase the int, C, C23b5/50, 5/18, 5/20 brightness of the cathode deposit; to increase the toler U.S. C. 204-40 2 Claims O ance of the bath to impurities; and to aid in anode cor OSO Although often heretofore used as an additive, citric ABSTRACT OF THE DISCLOSURE acid or its salts have never before been used as the A new method for electroplating copper on an article Ripal complexing agent for copper in electroplating utilizing aqueous copper salt-citric acid solutions in which 5 ath.S. citric acid is the principal complexing agent for the copper SUMMARY OF THE INVENTION ion in the solution. Cupric salts are preferred in this in In contrast to the prior art, it has been surprisingly vention, especially CuCO'Cu(OH)2 and CuSO4.5H2O, found that copper can be electrodeposited on an article for both plating solutions and strike solutions.
    [Show full text]
  • Questions and Answers on Boric Acid and Borates Used As Excipients in Medicinal Products for Human Use
    9 October 2017 EMA/CHMP/619104/2013 Committee for Human Medicinal Products (CHMP) Questions and answers on boric acid and borates used as excipients in medicinal products for human use Draft agreed by Excipients Drafting group 16 June 2015 Adopted by CHMP for release for consultation 23 July 2015 Start of public consultation 31 July 2015 End of consultation (deadline for comments) 31 October 2015 Agreed by Excipients Drafting group 16 June 2016 Adopted by CHMP 21 July 2016 Date of publication 9 October 2017 Keywords Excipients, Package leaflet, Boric acid, Borates, Boron, Borax This document should be read in the context of the revision of the Annex of the European Commission guideline ‘Excipients in the labelling and package leaflet of medicinal products for human use’ (EMA/CHMP/3026202017) [1]. 30 Churchill Place ● Canary Wharf ● London E14 5EU ● United Kingdom Telephone +44 (0)20 3660 6000 Facsimile +44 (0)20 3660 5555 Send a question via our website www.ema.europa.eu/contact An agency of the European Union © European Medicines Agency, 2017. Reproduction is authorised provided the source is acknowledged. Questions and answers on boric acid and borates used as excipients in medicinal products for human use Table of contents Table of contents ......................................................................................... 2 1. What is boric acid and why is it used as an excipient?............................. 3 2. Which medicinal products contain boric acid? ......................................... 3 3. What are the safety concerns? ................................................................ 3 4. What are the reasons for updating the information in the package leaflet? ........................................................................................................ 4 5. Proposal for new information in the package leaflet ............................... 5 Annex - Doses of boric acid, borax and borax anhydrous corresponding to the thresholds determined for boron ..........................................................
    [Show full text]