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HCID 26052Erstellt: 27. Oktober 2026

Wolframsäure, Dinatrium-Salz

Na2WO4 · TUNGSTEN METAL · AMMONIUM WOLFRAMATE · W HC 40 · TUNGSTEN RIBBON · SODIUM TUNGSTATE · disodiumtungstate · SODIUMTUNGSTENATE

https://huagongshe.com/de/chemical/26052

Molekülstruktur von Wolframsäure, Dinatrium-Salz

Identifikatoren & physikalische Daten

CAS No.13472-45-2
SummenformelNa2O4W
Durchschnittliche Molmasse293,82 g/mol
SMILES[Na+].[Na+].[O]=[W](=[O])([O-])[O-]
InChIKeyXMVONEAAOPAGAO-UHFFFAOYSA-N
PubChem CID26052
ChEMBLCHEMBL85943
ChEBICHEBI:63940
EC No.236-743-4
Lokaler NameWolframsäure, Dinatrium-Salz

Chemische & physikalische Eigenschaften

Polarare Oberfläche (TPSA)80,3
H-Brücken-Donoren0
H-Brücken-Akzeptoren4
Frei drehbare Bindungen0
Schwere Atome7
Formalladung0
Komplexität62,2
StoffklassenMetals -> Metals, Inorganic Compounds
Dichte4.1794.179 @25 °C2.3 g/mL at 25 °C(lit.)
Color/FormWHITE, RHOMBICWhite crystalline powder or granules
LöslichkeitColorless crystals or white crystalline powderloses its water @ 100 °Caq soln is slightly alkaline, pH 8-9effloresces in dry airsol in about 1.1 parts waterinsol in alc /Dihydrate/SLIGHTLY SOL IN AMMONIAINSOL IN ACID /DIHYDRATE/SOL 57.5 G/100 CC WATER @ 0 °C73.2 G @ 21 °C96.9 G @ 100 °CH2O: solubleg/100g H2O: 71.5 (0°C), 73.0 (20°C), 97.2 (100°C) [LAN05]
DecompositionWhen heated to decomposition it emits toxic fumes of /sodium oxide/.
Schmelzpunkt698 °C695 °C3410 °C(lit.)
Physical DescriptionLiquidWhite solid[HSDB] White powder[MSDSonline] Soluble in water[Hawley]
Other Experimental PropertiesWhite orthorhombic crystalsmolecular weight: 329.85MP: decomposes at 100 °Cdensity: 3.25very sol in water, insol in ethanol /Dihydrate/
Siedepunkt5660 °C(lit.)
Dampfdruck0Pa at 25℃
Aggregatzustandwire
pKa (Säurekonstante)3.5[at 20 ℃]
Farbewhite rhombohedral crystals, crystalline
Merck13,8772
Hauptanwendungenindustrial qcpharmaceutical
InChIInChI=1S/2Na.4O.W/q2*+12*-1
InChIKeyXMVONEAAOPAGAO-UHFFFAOYSA-N
SMILES[W]([O-])([O-])(=O)=O.[Na+].[Na+]
LogP (Verteilungskoeffizient)0
CAS Datenbank13472-45-2(CAS DataBase Reference)
EPA chemische InformationenSodium tungsten oxide (Na2WO4) (13472-45-2)

Sicherheit & Vorschriften

GHS-EinstufungWarningH302 (100%): Harmful if swallowed [Warning Acute toxicity, oral]P264, P270, P301+P317, P330, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 684 reports by companies from 6 notifications to the ECHA C&L Inventory.
Regulatorische InformationenChemical: Tungstic acid (H2WO4), disodium saltSodium tungsten oxide (Na2WO4) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Sodium tungsten oxide (Na2WO4) 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: 14-12-2022 https://echa.europa.eu/registration-dossier/-/registered-dossier/12708Disodium tungstate: Does not have an individual approval but may be used under an appropriate group standard
GefahrenübersichtIn high-dose animal experiments, sodium tungstate is the most toxic form of tungstenOral LD50 (rat) = 223-255 mg/kg[ACGIH] May cause irritation[MSDSonline] See Tungsten.
NIOSH RecommendationsRecommended Exposure Limit: 10 Hr Time-Weighted Avg: 1 mg/cu m. /Tungsten, soluble compounds, as W/
Hazard Classes and CategoriesAcute Tox. 4 (100%)Acute toxicity (Oral) - Category 4
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.
Threshold Limit Values (TLV)3.0 [mg/m3], as W, respirable particulate matter8 hr Time Weighted Avg (TWA): 1 mg/cu m15 min Short Term Exposure Limit (STEL): 3 mg/cu m. /Tungsten, soluble compounds, as W/
Protective Action Criteria (PAC)4.8 [mg/m3]

Anwendungen & Verwendung

Verwenden

Intermediate in preparation of tungsten compounds, (e.g., phosphotungstate), reagent, fire-proofing fabrics and cellulose, alkaloid precipitant.

Herstellung & Synthese

synthetische

Sodium tungstate is obtained by digestion of tungsten ores, the economically important representatives of which are tungstates, in base. Illustrative is the extraction of sodium tungstate from wolframite:Fe/MnWO4 + 2 NaOH + 2 H2O → Na2WO42H2O + Fe/Mn(OH)2Sodium tungstate can also be produced by treating tungsten carbide with a mixture of sodium nitrate and sodium hydroxide in a fusion process which overcomes the high exothermicity of the reaction involved.

39 [mg/m3]
240 [mg/m3]
KörperbelastungSerum concns of tungsten in healthy subjects are of the order of 6 ug/l(1). The mean concn of tungsten in urine samples from 14 unexposed persons was 0.21 +/- 0.09 ug/l(2).
WechselwirkungenDIETARY TUNGSTATE AT 5 PPM REDUCES THE TOXIC EFFECTS OF SELENIUM IN MAMMALS. /TUNGSTATE/
UmweltverhaltenTERRESTRIAL FATE: Tungsten compounds in soils are in the form of tungstate (i.e., WO4-2) and other tungsten polyanions(1). There are no reports of tungsten organic complexes(1). The sorption coefficient for tungsten increases with decreasing pH(2). It ranges from 100-50,000 at about pH 5, 10-6,000 at about pH 6.5, and 5-90 at between pH 8-9(2). These sorption coefficients values suggest that tungsten compounds will have moderate to no mobility in soils(SRC). Tungsten compounds will exist as ions or insoluble solids in the environment(3) and therefore volatilization from moist soil surfaces will not be an important fate process(SRC). Tungsten compounds are also will not volatilize from dry soil surfaces based upon their ionic character and low vapor pressures(SRC).AQUATIC FATE: Tungsten in natural waters is in the form of tungstate (i.e., WO4-2) and other tungsten polyanions(1). There are no reports of tungsten organic complexes(1). The sorption coefficient for tungsten increases with decreasing pH(2). It ranges from 100-50,000 at about pH 5, 10-6,000 at about pH 6.5, and 5-90 between pH 8-9(2). These sorption coefficients values suggest that tungsten compounds will adsorb to suspended solids and sediment(SRC). Tungsten compounds will exist as ions or insoluble solids in the environment(3) and therefore volatilization from water surfaces will not be an important fate process(SRC).ATMOSPHERIC FATE: Most tungsten compounds have low pressures at 25 °C and are expected to exist solely in the particulate phase in the ambient atmosphere. Particulate-phase tungsten compounds may be removed from the air by wet and dry deposition. (SRC)
LebensmitteluntersuchungswerteThe mean concn of tungsten in onions from Danish agricultural crops was 16.7 ug/kg (fresh weightrange, 6.3-39 ug/kg)(1).
Plant ConcentrationsThe range of tungsten concns in plants ranged from <0.001-100 mg/kg (dry wt)(1). The mean concn of tungsten in agricultural plants from Iowa was 0.18 mg/kg (samples = 22range, 0-0.35 mg/kg)(2). Tree leaves from New Zealand contained tungsten at a mean concns of 2.2 to 3.5 mg/kg (range, 0.1-13 mg/kg)(2).
Soil Adsorption/MobilityThe sorption coefficient for tungsten increases with decreasing pH(1). The sorption coefficient ranges from 100-50,000 at about pH 5, 10-6,000 at about pH 6.5, and 5-90 at between pH 8-9(1). The sorption behavior of tungsten is due to changes in the surface charge of the soil as the contact solution becomes more acidic or alkaline(1). These sorption coefficients suggest that tungsten compounds are expected to have moderate to no mobility in soil under normal environmental conditions(SRC).
Natural Pollution SourcesTungsten deposits occur in association with metamorphic rocks and granitic igneous rocks throughout the world.
Artificial Pollution SourcesThe production and use of tungsten compounds as cutting tools, abrasion resistant surfaces, and forming tools (e.g., tungsten carbide)filaments (e.g., tungsten metal and alloys)catalysts (e.g., tungsten oxides, sulfides, and heteropoly complexes)thin films (e.g., tungsten disulfide)and dyes and pigments (e.g., organic tungsten)(1) may result in the release of tungsten to the environment through various waste streams(SRC). Tungsten may be released to soil as a contaminate in phosphate fertilizers and manure(2,3). Only small concns of tungsten have been released into the atmosphere primarily by industrial emissions and nuclear fall-out(4).
Sediment/Soil ConcentrationsThe range of tungsten concns in surface soils was from 0.68-2.7 mg/kg(1). Agricultural soils from New Zealand had mean concns of tungsten ranging from 1.9 to 21.4 mg/kg(2). The mean tungsten concn in Iowa agricultural soils was 0.89 mg/kg (range, 0-2 mg/kg)(2).
Volatilization from Water/SoilTungsten compounds are expected to exist as ions or insoluble solids in the environment(1) and therefore volatilization from moist soil and water surfaces is not expected to be an important fate process(SRC). Tungsten compounds are not expected to volatilize from dry soil surfaces based upon their ionic character and low vapor pressures(SRC).
Non-Human Toxicity Excerpts...YOUNG RATS WERE FED FOR...70 DAYS...SODIUM TUNGSTATE EQUIV TO 2% W... MARKEDLY TOXIC, CAUSING INITIAL WT LOSS...DEATHS OF ALL ANIMALS...WITHIN 10 DAYS. IN DIETS HAVING EQUIV 0.5% W...DEATH IN 3/4 RATS.SODIUM TUNGSTATE ANTAGONIZES THE NORMAL METABOLIC ACTION OF MOLYBDATE IN ITS ROLE AS METAL CARRIER FOR XANTHINE DEHYDROGENASE. ...SODIUM TUNGSTATE ADDED TO DIET INHIBITED THE INTESTINAL DEPOSITION OF XANTHINE OXIDASE IN RAT & REDUCED...XANTHINE DEHYDROGENASE & MOLYBDENUM CONCN IN LIVER OF CHICKEN....SODIUM TUNGSTATE /FED/ TO GOATS & COWS...SHOWED REDN IN XANTHINE OXIDASE SECRETED IN MILK... POSTULATED THAT TUNGSTATE CAN PREFERENTIALLY OCCUPY ENZYME SITES NORMALLY OCCUPIED BY MOLYBDATE.SOL SODIUM TUNGSTATE...INJECTED SC IN...RATS... VERY YOUNG RATS (30 DAYS OLD) SURVIVED A DOSE THAT PROVED LETHAL TO OLD RATS.For more Non-Human Toxicity Excerpts (Complete) data for SODIUM TUNGSTATE (7 total), please visit the HSDB record page.
Environmental Abiotic DegradationTungsten exists in several oxidation states, 0, 2+, 3+, 4+, 5+, and 6+(1,2). The most stable is 6+ with the lower states being relatively unstable(2). Tungsten exist as ions in combination with one or more elements, e.g., oxygen(1). Tungsten in natural waters is in the form of tungstate (i.e., WO4- 2) and other tungsten polyanions(3). There are no reports of tungsten organic complexes(3). Bivalent tungsten exists only as halogen compounds(1). Tungsten has a strong tendency to form complexes exemplified by a large series of heteropoly acids formed with oxides of phosphorus, arsenic, vanadium, and silicon, among others (e.g., phosphotungstic acid)(2). In addition, compounds of tungsten exist in which tungsten occurs in more than one valence state(2). Tungsten forms a series of oxyhalides (e.g., WOCl4, WO2Cl2, and WOBr4)(2).
Wassergefährdungsklasse (WGK)3
TSCA-Inventar-StatusTSCA listed
UN-TransportnummerUN 3089 4.1/PG 2
RTECS-Nr.YO7175000
R-Sätze (R)36/38
GefahrensymboleXi
Sicherheitshinweise (S)6-26-36
Gefahrenklasse6.1(b)
VerpackungsgruppeIII
Lagerklasse12 - Non Combustible Liquids
Gefahrstoffdaten13472-45-2(Hazardous Substances Data)