Wolframsäure, Dinatrium-Salz

4.179

4.179 @25 °C

WHITE, RHOMBIC

White crystalline powder or granules

Colorless crystals or white crystalline powder; loses its water @ 100 °C; aq soln is slightly alkaline, pH 8-9; effloresces in dry air; sol in about 1.1 parts water; insol in alc /Dihydrate/

SLIGHTLY SOL IN AMMONIA; INSOL IN ACID /DIHYDRATE/

SOL 57.5 G/100 CC WATER @ 0 °C; 73.2 G @ 21 °C; 96.9 G @ 100 °C

698 °C

695 °C

Liquid

White solid; [HSDB] White powder; [MSDSonline] Soluble in water; [Hawley]

Warning

H302 (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.

Warning

H302 (100%): Harmful if swallowed [Warning Acute toxicity, oral]

Chemical: Tungstic acid (H2WO4), disodium salt

Sodium 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/12708

Disodium tungstate: Does not have an individual approval but may be used under an appropriate group standard

Acute Tox. 4 (100%)

Acute Tox. 4 (100%)

Acute toxicity (Oral) - Category 4

SRP: 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.

3.0 [mg/m3], as W, respirable particulate matter

8 hr Time Weighted Avg (TWA): 1 mg/cu m; 15 min Short Term Exposure Limit (STEL): 3 mg/cu m. /Tungsten, soluble compounds, as W/

4.8 [mg/m3]

39 [mg/m3]

240 [mg/m3]

TERRESTRIAL 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)

The 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 = 22; range, 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).

The 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).

The 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).

The 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).

Tungsten 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).

...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.

Tungsten 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).

RATS...FED...100 DAYS ON DIETS /INCL SODIUM TUNGSTATE/... PRINCIPAL SITES OF DEPOSITION WERE BONE & SPLEEN WITH TRACE QUANTITIES (LESS THAN 1.0 MG %...) IN KIDNEY & LIVER, & IN SOME ANIMALS IN BLOOD, LUNG, MUSCLE & TESTES.

...AFTER ORAL ADMIN OF SODIUM TUNGSTATE...AFTER 1 DAY, GREATEST CONCN IN SPLEEN FOLLOWED BY KIDNEY, PELT, BONE & LIVER. ...FOLLOWING ADMIN...BY GASTRIC INTUBATION IN RATS...HIGHEST CONCN IN KIDNEY FOLLOWED BY BONE & SPLEEN.

ALMOST 1/2 OF INGESTED DOSE...OF A SOL SALT...RAPIDLY ABSORBED IN...ANIMAL MODELS... MOST OF ABSORBED TUNGSTEN...RAPIDLY EXCRETED IN URINE. SMALL AMT... RETAINED WAS TRANSFERRED IN PART FROM PLASMA TO RED BLOOD CELLS & DISTRIBUTED MAINLY TO SPLEEN, KIDNEY, & BONE. /SOL W SALT/

FOLLOWING IV ADMIN (181)W SODIUM TUNGSTATE IN 2 BEAGLE DOGS, MOST OF ACTIVITY WAS FOUND IN PLASMA DURING 1ST 24 HR, WITH AVG PLASMA TO RED CELL RATIO 3:1, SUGGESTING BINDING OF TUNGSTEN TO CELL SURFACE RATHER THAN PENETRATION OF CELL MEMBRANE. ...SUGGESTED THAT W INCORPORATION INTO RED CELLS OCCURS @ SITES OF HEMATOPOIESIS.

For more Absorption, Distribution and Excretion (Complete) data for SODIUM TUNGSTATE (8 total), please visit the HSDB record page.

Used to make fire and water resistant fabrics, metallic tungsten, and other tungsten compounds; Also used as a biological reagent, a precipitant for alkaloids, and a catalyst for the oxidation of maleic acid; [HSDB]

Textiles (Printing, Dyeing, or Finishing) [Category: Industry]

Fireproofing and waterproofing fabrics; preparing complex compd, such as phosphotungstate, silicotungstate; as a reagent for biological products; precipitant for alkaloids

CHEM INT FOR METALLIC TUNGSTEN & TUNGSTEN COMPOUNDS; CHEM INT FOR PHOSPHOTUNGSTIC ACID, A DYE COMPONENT; COMPONENT OF NON- & SEMI-DURABLE TEXTILE FLAME RETARDANTS

Flame retardant textile treatment agent

Catalyst used in the oxidation of maleic acid

(1977) No Data

(1979) No Data

(1976) 1.59X10+7 GRAMS

(1979) No Data

2023: 10,000,000 - <50,000,000 lb

(1977) No Data

(1979) No Data

By dissolving tungsten trioxide or the ground ore in caustic soda soln, concn and crystallization. /Dihydrate/

4TH 377 (1974)] A MIXT OF SOFT & HARD TUNGSTEN CARBIDE IS REACTED WITH A MIXT OF NANO3 & NAOH TO YIELD SODIUM TUNGSTATE IN A FUSION PROCESS WHICH OVERCOMES THE HIGH EXOTHERMICITY OF THE REACTION INVOLVED.[POWERS JA, RECOVERY OF SODIUM TUNGSTATE FROM SCRAP TUNGSTEN CARBIDE, PROC MINER WASTE UTIL SYMP

Sodium hydroxide + tungsten trioxide (salt formation)

Primary Metal Manufacturing

Sodium tungsten oxide (Na2WO4): ACTIVE

SODIUM TUNGSTATE IS DERIVED FROM TUNGSTEN CARBIDE AFTER IT IS REACTED WITH MIXT OF NANO3 & NAOH.