Molybdenum｜化工社

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HCID 23932作成日：2026年10月27日

Molybdenum

https://huagongshe.com/ja/chemical/23932

Molybdenum の分子構造式

識別子と物理属性

CAS No.	16065-87-5
分子式	Mo
平均分子量	95.95 g/mol
単同位体質量	97.9054082 g/mol
SMILES	[Mo]
InChIKey	ZOKXTWBITQBERF-UHFFFAOYSA-N
PubChem CID	23932
ChEBI	CHEBI:28685
EC No.	231-107-2
DTXSID	DTXSID1024207

化学・物理的性質

極性表面積	0
水素結合供与体数	0
水素結合受容体数	0
回転可能結合数	0
重原子数	1
形式電荷	0
複雑度	0
物質分類	Metals -> Elements, MetallicTrace element
SpringerMaterials Properties	electron density of states
農薬	Pesticide -> EPA IRIS
密度	10.28 (NIOSH, 2024) - Denser than waterwill sink10.2 g/cu cm10.2 g/cm³10.2 @25 °C
Color/Form	Dark-gray or black powder with metallic luster or coherent mass of silver white colorbody centered cubic structureVery hard, but more ductile that the chemically similar element tungstenGray-black metal, cubic
溶解度	Insoluble (NIOSH, 2024)Practically insoluble in alkali hydroxides or fused alkalisreacts with nitric acid, hot concentrated sulfuric acid, fused potassium chlorate or nitrateInsoluble in watersoluble in nitric acid, sulfuric acidslightly soluble in hydrochloric acidinsoluble in hydrofluoric acid, dilute sulfuric acidInsoluble in hydrochloric acid and hydrogen fluoride, ammonia, sodium hydroxide, or dilute sulfuric acidsoluble in hot concentrated sulfuric or nitric acidsSolubility in water: none
沸点	8717 °F at 760 mmHg (NIOSH, 2024)4639 °C4612 °C4639 °C @760 [mm Hg]
融点	4752 °F (NIOSH, 2024)2622 °C2617 °C2623 °C
蒸気圧	0 mmHg (approx) (NIOSH, 2024)Vapor pressure: 1.83X10-9 Pa at 1600 K4.07X10-7 Pa at 1800 K3.03X10-5 Pa at 2000 K 0.00102 Pa at 2200 K0.0189 Pa at 2400 K /Calculated/1 Pa at 2469 °C (solid)10 Pa at 2721 °C100 Pa at 3039 °C1 kPa at 3434 °C10 kPa at 3939 °C100 kPa at 4606 °C
Heat of Vaporization	491 kJ/mol
Physical Description	MOLYBDENUM, a chemical element, is a hard, high-melting (refractory) high-density dark gray metal or black powder. Insoluble in water. Used to make structural alloysused as a catalyst. Molybdenum dust and fumes can irritate the eyes and respiratory tract.Wet SolidOther SolidLarge CrystalsCBIDry PowderDark gray or black powder with a metallic luster[NIOSH]SILVER-WHITE LUSTROUS METAL OR DARK GREY POWDER.Dark gray or black powder with a metallic luster.
Stability/Shelf Life	FAIRLY STABLE @ ORDINARY TEMP

安全性と法規制

GHS 分類	This chemical does not meet GHS hazard criteria for 57.4% (874 of 1523) of all reports.DangerH225 (11.6%): Highly Flammable liquid and vapor [Danger Flammable liquids]P203, P210, P233, P240, P241, P242, P243, P280, P303+P361+P353, P318, P370+P378, P403+P235, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 1523 reports by companies from 14 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.Warning
規制情報	Chemical: MolybdenumHazard Traits - CarcinogenicityEndocrine ToxicityEnvironmental toxOther Toxicological Hazard TraitsReproductive ToxicityRespiratory ToxicityMolybdenum is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Molybdenum 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: 28-03-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/15524Molybdenum: Does not have an individual approval but may be used under an appropriate group standard
その他の安全情報	IMAP assessments - Molybdenum: Human health tier I assessment
輸送ラベル（DOT）	Flammable Solid
火災危険	Excerpt from ERG Guide 170 [Metals (Powders, Dusts, Shavings, Borings, Turnings, or Cuttings, etc.)]:Combustible under specific conditions. Finely dispersed particles form explosive mixtures in air.
火災の可能性	FLAMMABLE IN FORM OF DUST OR POWDER.
健康有害性	Excerpt from NIOSH Pocket Guide for Molybdenum:
有害性の概要	Molybdenum is a chemical element with the symbol Mo. Pure molybdenum exists as a dark-gray or black powder with a metallic luster or as a silvery-white mass. It does not occur naturally in the pure metallic form. It is principally found as oxide or sulfide compounds. Therefore, almost all exposure is to a molybdenum compound rather than the actual metal alone. Important naturally occurring molybdenum compounds are the minerals molybdenite, powellite, wulfenite, ferrimolybdite, and ilsemannite. Molybdenum has a very high melting point and it is used widely in industry to make steel alloys.

Reactivity Profile

MOLYBDENUM is a reducing agent. In dust or powder form, it may present a fire or explosion hazard under favoring conditions of particle size, dispersion and ignition. Bulk molybdenum (rod, coil, sheet, etc.) is less reactive than dust or powder. Insoluble in hydrochloric acid or hydrofluoric acid solutions and in ammonia and sodium hydroxide solutions. Insoluble in dilute sulfuric acid solutions but soluble in concentrated sulfuric acid. Soluble in concentrated nitric acid. Incompatible with strong oxidizing agents such as bromine trifluoride, bromine pentafluoride, chlorine trifluoride, potassium perchlorate, nitryl fluoride, fluorine, iodine pentafluoride, sodium peroxide, lead dioxide.

応急処置措置	Fresh air, rest.Rinse skin with plenty of water or shower.Rinse with plenty of water for several minutes (remove contact lenses if easily possible).Rinse mouth. Give one or two glasses of water to drink.

保管条件	Prior to working with this chemical you should be trained on its proper handling and storage. Manganese must be stored to avoid contact with strong oxidizers (such as chlorine, bromine, and fluorine) since violent reactions occur. Store in tightly closed containers in a cool, well ventilated area away from bromine, trifluoride, fluorine, chlorine trifluoride and lead oxide.

清掃方法

Evacuate and restrict persons not wearing protective equipment from area of spill or leak until cleanup is complete. Remove all ignition sources. Use HEPA vacuum or wet method to reduce dust during clean-up. Do not dry sweep. Collect powdered material in the most convenient and safe manner and deposit in sealed containers. Ventilate area after clean-up is complete. It may be necessary to contain and dispose of this chemical as a hazardous waste. If material or contaminated runoff enters waterways, notify downstream users of potentially contaminated waters. Contact your Department of Environmental Protection or your regional office of the federal EPA for specific recommendations. If employees are required to clean up spills, they must be properly trained and equipped. OSHA 1910.120(q) may be applicable.

処分方法

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air qualitypotential migration in soil or watereffects on animal, aquatic, and plant lifeand conformance with environmental and public health regulations.Recovery is indicated whenever possible. Processes for recovery of molybdenum from scrap, flue dusts, spent catalysts, and other industrial wastes have been developed.The following wastewater treatment technologies have been investigated for molybdenum: Chemical precipitation.

漏出処分	Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting.

Preventive Measures

SRP: 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.... 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/

毒性の概要

High levels of molybdenum can interfere with the body's uptake of copper, producing copper deficiency. Molybdenum prevents plasma proteins from binding to copper, and it also increases the amount of copper that is excreted in urine. Molybdenum dusts and fumes, which can be generated by mining or metalworking, can be toxic, especially if ingested (including dust trapped in the sinuses and later swallowed). (Wikipedia)

Medical Surveillance

The following medical procedures should be made available to each employee who is exposed to molybdenum and insoluble molybdenum compounds at potentially hazardous levels: Initial medical screening: Employees should be screened for history of certain medical conditions /kidney diseasechronic respiratory diseaseliver disease/ which might place the employee at increased risk from molybdenum and insoluble molybdenum compounds exposure. Periodic medical exam: Any employee developing the above listed conditions should be referred for further medical examination. /Molybdenum and insoluble molybdenum compounds/

Human Toxicity Excerpts

/SIGNS AND SYMPTOMS/ Metallic and poorly soluble molybdenum compounds (such as molybdenum disulfide, molybdenum dioxide) have limited animal experimental data and no human toxicity data. From the scant information available, these materials thought to be poorly soluble and to have low animal and human toxicity. Until toxicologic or human data indicate a more serious threat to human health, these materials are assigned TLV-TWAs of 10 mg/m3 (inhalable particulate mass) and 3 mg/m3 (respirable particulate mass) to protect against any irritant effects of these materials. /Metallic molybdenum and poorly soluble molybdenum//SIGNS AND SYMPTOMS/ Pneumoconiosis with X-ray findings and subjective symptoms ... 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 to 7 yr. /Metallic molybdenum and molybdenum trioxide//SIGNS AND SYMPTOMS/ Increased blood uric acid values and gout-like symptoms have been reported among workers exposed to molybdenum in a copper-molybdenum plant ... . /Molybdenum and compounds//SIGNS AND SYMPTOMS/ In a 1984 review, an increased incidence of nonspecific symptoms, including weakness, fatigue, headache, anorexia, and joint and muscle pains, was reported among mining and metallurgy workers exposed at 60 to 600 mg/cu m molybdenum /Molybdenum dusts/For more Human Toxicity Excerpts (Complete) data for MOLYBDENUM (7 total), please visit the HSDB record page.

Non-Human Toxicity Excerpts

/LABORATORY ANIMALS: Acute Exposure/When rats inhaled dusts of metallic molybdenum for 1 hour at 25 to 30 g/cu m, there were no changes in the condition of the animals observed in the 4 weeks following exposure./LABORATORY ANIMALS: Subchronic or Prechronic Exposure/ ... Rats/were exposed/ to aerosols of metallic molybdenum ... 1 hour daily for 30 days. Exposure concentrations were as follows: molybdenum metal, 12 to 15 g/cu m ... . With the exception of slight growth depression, all the rats exposed to metallic molybdenum ... appeared normal during the exposure period. There was considerable deposition of dust in the lungs with thickening of the alveolar septa, which contained connective tissue fibers./LABORATORY ANIMALS: Chronic Exposure or Carcinogenicity/ ... Rabbits were given a suspension of powdered molybdenum intratracheally in doses of 70-80 mg/kg. After nine months, diffuse pneumoconiosis with interstitial pneumonia was observed upon histological exam./OTHER TOXICITY INFORMATION/ Fume from arcing molybdenum metal causes kidney /and liver/ damage in animals. /Molybdenum fume/