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HCID 14802Erstellt: 27. Oktober 2026

Molybddntrioxid

MoO3 · MOLYBDENUM OXIDE · MoL · MOLYBDENUM(VI) OXIDE · MOLYBDIC OXIDE · MOLYBDIC ANHYDRIDE · trioxomolybdenum · XFJ34

https://huagongshe.com/de/chemical/14802

Molekülstruktur von Molybddntrioxid

Identifikatoren & physikalische Daten

CAS No.11098-99-0
SummenformelMoO3
Durchschnittliche Molmasse143,95 g/mol
Monoisotopische Masse145,89015206 g/mol
SMILES[O]=[Mo](=[O])=[O]
InChIKeyJKQOBWVOAYFWKG-UHFFFAOYSA-N
PubChem CID14802
ChEBICHEBI:30627
EC No.215-204-7
DTXSIDDTXSID7020899
Lokaler NameMolybddntrioxid

Chemische & physikalische Eigenschaften

Polarare Oberfläche (TPSA)51,2
H-Brücken-Donoren0
H-Brücken-Akzeptoren3
Frei drehbare Bindungen0
Schwere Atome4
Formalladung0
Komplexität61,8
StoffklassenMetals -> Metals, Inorganic Compounds
SpringerMaterials Propertiesphonon wavenumber
GeruchNone
Dichte4.69 at 68 °F (USCG, 1999) - Denser than waterwill sink4.69 @ 26 °C/4 °C4.696 @25 °C4.692
Color/FormWHITE OR SLIGHTLY YELLOW TO SLIGHTLY BLUISH POWDER OR GRANULESCOLORLESS OR WHITE YELLOW RHOMBIC CRYSTALSWHITE POWDER AT ROOM TEMP, YELLOW AT ELEVATED TEMP
Löslichkeitless than 1 mg/mL at 75 °F (NTP, 1992)After strong ignition it is very slightly sol in acids0.490 g/1000 cc water @ 28 °CSol in concentrated mineral acidsSol in soln of alkali hydroxides and soln of potassium bitartrate1.066 g/l water @ 18 °C0.49g/l0.5 g/L (20 ºC)
Siedepunkt2111 °F at 760 mmHg (Sublimes) (NTP, 1992)1155 °C, SUBLIMES1155 °C @760 [mm Hg]
Schmelzpunkt1463 °F (NTP, 1992)795 °C802 °C795 °C(lit.)
Physical DescriptionMolybdenum trioxide appears as colorless to white or yellow odorless solid. Sinks in water. (USCG, 1999)Large CrystalsCBIDry PowderOther SolidWet SolidLiquidWhite or slightly yellow to slightly bluish solid[Merck Index] Light green odorless powderPartially soluble in water (1.07 g/L at 18 deg C)[MSDSonline] A soluble compound[ACGIH]
Other Experimental PropertiesREADILY COMBINES WITH ACIDS & BASES TO FORM A SERIES OF POLYMERIC CMPDPENTAVALENT MOLYBDENUM COMPLEXES ARE UNSTABLE TO OXIDATION, BUT HEXAVALENT MOLYBDENUM COMPLEXES WITH OXYGEN AS THE PREFERRED LIGAND & FORMS STABLE ISOPOLY & HETEROPOLY ACIDS & SALTS ... THESE POLYACIDS CAN REACT WITH PHOSPHATES & TARTRATES IN BIOLOGIC FLUIDS & TISSUES. BECAUSE OF PREFERRED AFFINITY OF MOLYBDENUM 6+ FOR OXYGEN LIGANDS, MOLYBDENUM BINDS TO CARBOXY GROUPS, HYDROXYL GROUPS, & ALSO SULFHYDRYL GROUPS PRESENT IN MACROMOLECULES. /MOLYBDENUM/
Dampfdruck0Pa at 20℃
Brechungsindex2.5166
Flammpunkt1155°C subl.
LagerbedingungenStore at +5°C to +30°C.
AggregatzustandSublimed Powder
Wichte4.69
FarbeWhite to gray
GeruchOdorless
Spezifische WärmekapazitätCp(crystal): 0.52 J/(g·K), at 25℃
Merck14,6239
InChI1S/Mo.3O
InChIKeyJKQOBWVOAYFWKG-UHFFFAOYSA-N
SMILESO=[Mo](=O)=O
CAS Datenbank1313-27-5(CAS DataBase Reference)
NIST chemische InformationenMolybdenum(vi) oxide(1313-27-5)
EPA chemische InformationenMolybdenum trioxide (1313-27-5)

Sicherheit & Vorschriften

GHS-EinstufungWarningH319: Causes serious eye irritation [Warning Serious eye damage/eye irritation]P203, P261, P264+P265, P271, P280, P304+P340, P305+P351+P338, P318, P319, P337+P317, P403+P233, P405, and P501 (click each P-code to see the statement)H319 (> 99.9%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
Regulatorische InformationenChemical: Molybdenum oxide (MoO3)Hazard Traits - CarcinogenicityMolybdenum oxide (MoO3) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Molybdenum oxide (MoO3) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)Status: Active Update: 27-04-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/15499Molybdenum (VI) oxide: Does not have an individual approval but may be used under an appropriate group standard
Weitere SicherheitsinformationenIMAP assessments - Molybdenum Trioxide and Molybdic Acid: Human health tier II assessment
DOT-KennzeichnungPoison
BrandgefahrenFlash point data for this chemical are not available, but it is probably non-flammable. (NTP, 1992)
GesundheitsgefahrenCompound is relatively nontoxic. Dust irritates eyes. (USCG, 1999)
GefahrenübersichtAn eye, mucous membrane, and upper respiratory tract irritant[HSDB] Serious health risk by ingestion or prolonged inhalation[eChemPortal: ESIS] Carcinogenicity in man cannot be assessed conclusively because of insufficient data (Group 3B)[MAK] An irritant[MSDSonline] See Molybdenum.
Reaktive GruppeNon-Redox-Active Inorganic Compounds
Special ReportsUSEPA, Office of Drinking WaterCriteria Document (Draft): Molybdenum (1985)Nat'l Research Council Canada

Anwendungen & Verwendung

Beschreibung

Molmasse 143.95 g/mol. Weißes Pulver, das sich beim Erhitzen gelb färbt und nach dem Erkalten wieder farblos wird. Beim Sublimieren erhält man glänzende, farblose, kristalline Flitter. F. 795 ℃, Kp. 1155 ℃. Löslichkeit in Wasser bei 28 ℃: 0.490 g MoO3; Kristallstruktur orthorhombisch (a = 3.92, b = 13.94, c = 3.66 A).

Verwenden

Molybdenum trioxide (MnO3) is a compound used to make enamels adhere to metals.

Herstellung & Synthese

synthetische

Molybdenum(VI) oxide is obtained by igniting molybdenum or its compounds in air: 2Mo + 3O2 → 2MoO3 2MoS2 + 7O2 → 2MoO3 + 4SO2 MoS2 + 4O2 → MoO3 + SO2 + SO3 Roasting the sulfide is carried out in a multiple-hearth roaster under controlled temperature and airflow. The product mixture is sublimed to obtain high purity oxide. Purified molybdenum(VI) oxide also is made by prolonged heating of ammonium molybdate in air: (NH4)2Mo2O7 → 2MoO3 + 2NH3 + H2O An alternative method involves repeatedly evaporating a mixture of ammonium molybdate and nitric acid. Ammonium nitrate so formed is separated from the product molybdenum(VI) oxide by extraction with water: (NH4)2Mo2O7 + 2HNO3 → 2MoO3 + 2NH4NO3 + H2O

Data Sheets on Selected Toxic Elements (1982) NRCC No. 19252
Toxicology & Carcinogenesis Studies of Molybdenum Trioxide in F344/N Rats and B6C3F1 Mice (Inhalation Studies). Technical Report Series No. 462 (1997) NIH Publication No. 97-3378 U.S. Department of Health and Human Services, National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709
TSCA-AnforderungenSection 8(a) of TSCA requires manufacturers of this chemical substance to report preliminary assessment information concerned with production, use, and exposure to EPA as cited in the preamble of the 51 FR 41329.
OSHA StandardsPermissible Exposure Limit: Table Z-1 8-hr Time Weighted Avg: 5 mg/cu m. /Molybdenum soluble compounds, as Mo/
Reactivity ProfileMOLYBDENUM TRIOXIDE reacts violently with chlorine trifluoride, lithium, potassium and sodium. Readily combines with acids and bases to form a series of polymeric compounds. Incompatible with interhalogens and metals. A violent detonation occurs when heated with molten magnesium. (NTP, 1992)
Air and Water ReactionsInsoluble in water.
BrandbekämpfungFires associated with this material can be controlled with a dry chemical, carbon dioxide, or Halon extinguisher. (NTP, 1992)
Erste HilfeEYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.
Freisetung ohne BrandSMALL SPILLS AND LEAKAGE: If you spill this chemical, dampen the solid spill material with 5% ammonium hydroxide, then transfer the dampened material to a suitable container. Use absorbent paper dampened with 5% ammonium hydroxide to pick up any remaining material. Your contaminated clothing and the absorbent paper should be sealed in a vapor-tight plastic bag for eventual disposal. Wash all contaminated surfaces with 5% ammonium hydroxide followed by washing with a soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.
EntsorgungsverfahrenSRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.
Preventive MeasuresSRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.Employees should wash promptly when skin becomes contaminated. Promptly remove nonimpervious clothing that becomes contaminated. /Molybdenum, soluble compounds (as Mo)/... A complete respiratory protection program should be instituted which incl regular training, maintenance, inspection, cleaning, and evaluation. /Sol Molybdenum compounds (as Mo)Molybdenum and insoluble molybdenum compounds/
Isolation and EvacuationExcerpt from ERG Guide 151 [Substances - Toxic (Non-Combustible)]:
Threshold Limit Values (TLV)0.5 [mg/m3], as Mo, respirable fraction8 hr Time Weighted Avg (TWA): 0.5 mg/cu m (respirable fraction). /Molybdenum, soluble compounds, as Mo/Excursion Limit Recommendation: Excursions in worker exposure levels may exceed 3 times the TLV-TWA for no more than a total of 30 minutes during a work day, and under no circumstances should they exceed 5 times the TLV-TWA, provided that the TLV-TWA is not exceeded. /Molybdenum, soluble compounds, as Mo/A3Confirmed animal carcinogen with unknown relevance to humans. /Molybdenum, soluble compounds, as Mo/
Permissible Exposure Limit (PEL)5.0 [mg/m3], as Mo
Protective Action Criteria (PAC)2.3 [mg/m3]43 [mg/m3]260 [mg/m3]
Personal Protective Equipment (PPE)U.S. Bu. Mines approved respiratorsafety glasses or face shieldprotective gloves (USCG, 1999)US BUREAU OF MINES APPROVED RESPIRATORPROTECTIVE GLOVESRespirator selection: Upper limit devices recommended by OSHA: Up to 50 mg/cu m: any dust respirator except single-use and quarter-mask respirators or any supplied air respirator or any self-contained breathing apparatusup to 125 mg/cu m: any powered air-purifying respirator with a dust and mist filter or any supplied-air respirator operated in a continuous flow modeup to 250 mg/cu m: any air-purifying full facepiece respirator with a high-efficiency particulate filter or any powered air-purifying respirator with a tight-fitting facepiece and a high-efficiency particulate filter or any supplied-air respirator with a tight-fitting facepiece operated in a continuous flow mode or any self-contained breathing apparatus with a full facepiece or any supplied-air respirator with a full facepieceup to 5000 mg/cu m: any supplied-air respirator with a half-mask and operated in a pressure-demand or other positive pressure modeup to 7500 mg/cu m: any supplied-air respirator with a full facepiece and operated in a pressure-demand or other positive pressure modeEmergency or planned entry in unknown concentration or IDLH conditions: any self-contained breathing apparatus with a full facepiece and operated in a pressure-demand or other positive pressure mode or any supplied-air respirator with a full facepiece and operated in a pressure-demand or other positive pressure mode in combination with an auxiliary self-contained breathing apparatus operated in pressure-demand or other positive pressure modeEscape: any air-purifying full facepiece respirator with a high-efficiency particulate filter or any appropriate escape-type self-contained breathing apparatus. /Molybdenum, soluble compounds, (as Mo)/Wear appropriate equipment to prevent repeated or prolonged skin contact. Wear eye protection to prevent reasonable probability of eye contact. /Molybdenum, soluble compounds (as Mo)/Employees should be provided with and required to use impervious clothing, gloves, face shields (eight inch minimum), and other appropriate protective clothing necessary to prevent repeated or prolonged skin contact with soluble molybdenum compounds or liquids containing soluble molybdenum compounds. ... Employees should be provided with and required to use dust and splash proof safety goggles where soluble molybdenum compounds or liquids containing soluble molybdenum compounds may contact the eyes. /Soluble molybdenum compounds (as molybdenum)/Respirators may be used when engineering and work practice controls are not technically feasible, when such controls are in the process of being installed, or when they fail and need to be supplemented. Respirators may also be used for operations which require entry into tanks or closed vessels, and in emergency situations. If the use of respirators is necessary, the only respirators permitted are those that have been approved by the Mine Safety and Health Administration (formerly Mining Enforcement and Safety Administration) or by the National Institute for Occupational Safety and Health. /Soluble Molybdenum cmpd (as Molybdenum)Molybdenum and insoluble molybdenum cmpd/
Other Standards Regulations and GuidelinesSoviet limits (1966), 4 and 6 mg/cu m for soluble and insoluble cmpd, respectivelyWest Germany, 5 and 15 mg/cu m for soluble and insoluble cmpd, respectivelyEast Germany, 10 mg/cu m for insoluble cmpd only. /Molybdenum compounds, sol and insoluble/
Immediately Dangerous to Life or Health (IDLH)1000 mg Mo/m3 (NIOSH, 2024)1000.0 [mg/m3], as Mo
KörperbelastungHumans: total body burden 9.3 mg amount in skeleton: 5 mg amount in liver: 2 mg kidney: 0.9-3.1 mg Mo/kg liver: 1.3-5.8 Mg mo/kg muscle: 0.018 mg Mo/kg bone: 0.7 mg Mo/kg hair: 0.06-0.2 mg Mo/kg nail: 0.15-16 mg Mo/kg whole blood: 0.001 mg Mo/kg.
WechselwirkungenMETABOLISM OF MOLYBDENUM IN ANIMAL IS CLOSELY LINKED WITH THAT OF COPPER, WITH WHICH IT APPEARS TO HAVE RECIPROCAL ANTAGONISM ... /MOLYBDENUM/THERE IS COMPLEX RELATIONSHIP BETWEEN MOLYBDENUM, COPPER & SULFATE, & PROBABLY SOME OTHER SULFUR CMPD. COPPER GENERALLY HAS BENEFICIAL EFFECT ON THE SYMPTOMS CAUSED BY EXCESSIVE MOLYBDENUM BUT THE ACTION OF THE SULFUR COMPOUNDS, ESPECIALLY SULFATE, IS NOT YET SO CLEARLY UNDERSTOOD. /MOLYBDENUM/ANTAGONISM BETWEEN MOLYBDENUM & COPPER IS ... INFLUENCED IN A COMPLEX WAY BY DIETARY SULFATE, DEPENDING ON SPECIES: ... (1) SULFATE INTAKE CAUSES A REDISTRIBUTION OF MOLYBDENUM IN BLOOD CHARACTERIZED BY RED CELL DEPLETION(2) SULFATE INCR ELIMINATION OF MOLYBDENUM FROM THE BODY(3) DEPLETION OF HEPATIC COPPER WITH ASSOCIATED SIGNS OF COPPER DEFICIENCY FROM MOLYBDENUM OCCURS ONLY AT DIETARY LEVELS ABOVE SOME CRITICAL VALUE AND IS THUS AN ANTAGONISTIC EFFECT OF SULFATE ON MOLYBDENUM METABOLISM AND TOXICITY IN THE RAT ... /MOLYBDENUM/
ÖkotoxizitätswerteLC50 Pimephales promelas (fathead minnow) 370 mg Mo/l/96 hr /Conditions of bioassay not specified/
LebensmitteluntersuchungswerteThe molybdenum content of food varies greatly. In general, legumes, cereals grains, leafy vegetables, liver, and kidney are good sourcesfruits, root and stem vegetables, muscle meats, and dairy products are among the poorest. /Molybdenum/
Unerwünschte WirkungenIARC Carcinogen - Class 3: Chemicals are not classifiable by the International Agency for Research on Cancer.
Average Daily IntakeDaily intake of molybdenum can be estimated to be between 100 and 500 ug. ... In areas where molybdenum ore is mined, considerable contamination may occur, which can cause high concentrations in drinking water leading to daily intakes of more than 1000 ug. /Molybdenum/
Plant ConcentrationsThe amount of molybdenum in vegetable crops is greatly influenced by the molybdenum content of soil. ... The availability is dependent on pH, that is, it is greater in alkaline soils. ... The available molybdenum is of greater importance for plant nutrition than is the total amount of molybdenum. /Molybdenum/The contents of ... molybdenum, and the copper/molybdenum ratio were determined in different native plant species from a mountain area of central southern Norway. The overall mean values and ranges (mg/kg dry mass) were ... molybdenum: 0.25, 0.01-3.57... copper/molybdenum: 79, 1-7955. /Molybdenum/
Ongoing Test StatusThe following link will take the user to the National Toxicology Program (NTP) Test Agent Search Results page, which tabulates all of the "Standard Toxicology & Carcinogenesis Studies", "Developmental Studies", and "Genetic Toxicity Studies" performed with this chemical. Clicking on the "Testing Status" link will take the user to the status (i.e., in review, in progress, in preparation, on test, completed, etc.) and results of all the studies that the NTP has done on this chemical. [http://ntp-apps.niehs.nih.gov/ntp_tox/index.cfm?fuseaction=ntpsearch.searchresults&searchterm=1313-27-5]
Medical SurveillanceThe following medical procedures should be made available to each employee who is exposed to soluble molybdenum compounds at potentially hazardous levels: Initial medical screening: employees should be screened for history of certain medical conditions which might place the employee at increased risk from soluble molybdenum compounds exposure. Only those giving a positive history of the /following/ conditions should be referred for further medical examination: kidney disease... chronic respiratory disease: In persons with impaired pulmonary function ... the breathing of sol molybdenum compounds might cause exacerbation of symptoms due to their irritant propertiesblood disease: ... persons with preexisting blood disorders may be more susceptible to the effects of these agentsgout: molybdenum compounds may cause gout. ... Periodic medical examination: Routine periodic exam are not considered necessary. However, anyone developing the above listed conditions should be referred for further medical examination. /Soluble molybdenum compounds (as Mo)/
Natural Pollution SourcesSoluble molybdate ions are present in trace concn in many surface waters .. as product of natural weathering of molybdenum bearing soils. /Molybdenum/Both suspended insoluble molybdenum sulfide and soluble molybdates are present in streams that drain areas where molybdenum ore is mined and processed, especially in Colorado and New Mexico.
Atmospheric ConcentrationsIn ambient air in urban areas, molybdenum ranged from 0.01 to 0.03 ug/cu m and in non urban areas it varied between 0.001 and 0.0032 ug/cu m. /Molybdenum/
Human Toxicity ExcerptsPneumoconiosis with x-ray findings and subjective symptoms has been reported in 3 out of 19 workers exposed to metallic molybdenum and molybdenum trioxide. Exposure varied between 1 and 19 mg/cu m for 4-7 years.A SURVEY OF A MOLYBDATE ROASTING PLANT IN COLORADO WAS MADE ... 25 MALE WORKERS WERE EXAMINED FOR BIOCHEMICAL ABNORMALITIES FROM EXPOSURE TO SOLUBLE MOLYBDENUM DUSTS. THE 8-HR TWA EXPOSURE TO SOLUBLE MOLYBDENUM (MAINLY MOLYBDENUM TRIOXIDE AND MOLYBDENUM OXIDES) WAS CALCULATED TO BE ABOUT 9.5 MG MOLYBDENUM/CU M, APPROXIMATELY DOUBLE THE RECOMMENDED TLV. THE MEAN AGE OF THE WORKERS WAS 28.3 YR (RANGE 19 TO 44 YR) AND THE MEAN DURATION OF EMPLOYMENT, 4.0 YR (RANGE 0.5 TO 20 YR). ... ONLY ADVERSE BIOCHEMICAL FINDINGS WERE LARGE ELEVATIONS IN SERUM CERULOPLASMIN (AVG 50.47 + or - 1.38 MG/100 ML VERSUS 30.50 + or - 1.33 MG/100 ML FOR CONTROLS) AND SMALLER INCREMENTS IN SERUM URIC ACID LEVELS (5.90 + or - 0.24 MG/100 VERSUS 5.01 + or - 0.25 MG/100 ML FOR CONTROLS).ANEMIA IS CHARACTERISTIC FEATURE OF MOLYBDENUM TOXICITY, WITH LOW HEMOGLOBIN CONCN AND REDUCED RED CELL COUNTS. /MOLYBDENUM COMPOUNDS/INCR BLOOD URIC ACID VALUES & GOUT LIKE SYMPTOMS HAVE BEEN REPORTED ... AMONG THE GENERAL POPULATION LIVING IN AREA WITH HIGH MOLYBDENUM & LOW COPPER CONTENT IN SOILS & VEGETABLES. /MOLYBDENUM/For more Human Toxicity Excerpts (Complete) data for MOLYBDENUM TRIOXIDE (6 total), please visit the HSDB record page.
Landesrichtlinien für Trinkwasser(FL) FLORIDA 35 ug/l /Molybdenum/(ME) MAINE 35 ug/l /Molybdenum/
Wassergefährdungsklasse (WGK)1
TSCA-Inventar-StatusTSCA listed
Zollcode28257000
RTECS-Nr.QA4725000
R-Sätze (R)36/37-48/20/22-40
ToxizitätLD50 orally in Rabbit: 2689 mg/kg LD50 dermal Rat > 2000 mg/kg
GefahrensymboleXn,Xi
Sicherheitshinweise (S)22-23-25-36/37
Gefahrenklasse6.1Carc. 2Eye Irrit. 2STOT SE 3
Lagerklasse11 - Combustible Solids
Gefahrstoffdaten1313-27-5(Hazardous Substances Data)