Sodium tungsten oxide (Na2WO4)

183.84

183.95100

231-143-9

64LRH4405G

DTXSID4021420

WHITE, RHOMBIC|White crystalline powder or granules

2841802000

80.3

0.00000

wire

4.179 g/cm³

698 °C

5660 °C(lit.)

H2O: soluble

White orthorhombic crystals; molecular weight: 329.85; MP: decomposes at 100 °C; density: 3.25; very sol in water, insol in ethanol /Dihydrate/

III

6.1(b)

UN 3089 4.1/PG 2

3

36/38

6-26-36

YO7175000

Xi

P280-P305 + P351 + P338-P337 + P313

H315-H319

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.

|Warning|H302 (100%): Harmful if swallowed [Warning Acute toxicity, oral]|P264, P270, P301+P312, P330, and P501|Aggregated GHS information provided by 577 companies from 5 notifications to the ECHA C&L Inventory.|The GHS information provided by 1 company from 1 notification to the ECHA C&L Inventory.|H302: Harmful if swallowed [Warning Acute toxicity, oral]|P264, P270, P301+P312, P305+P351+P338, P330, P337+P313, and P501

Recommended Exposure Limit: 10 Hr Time-Weighted Avg: 1 mg/cu m. /Tungsten, soluble compounds, as W/

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).

DIETARY TUNGSTATE AT 5 PPM REDUCES THE TOXIC EFFECTS OF SELENIUM IN MAMMALS. /TUNGSTATE/

LD50 Rat oral 1190 mg/kg|LD50 Rat sc 240 mg/kg|LD50 Mouse oral 240 mg/kg|LD50 Cat iv 139 mg/kg|For more Non-Human Toxicity Values (Complete) data for SODIUM TUNGSTATE (8 total), please visit the HSDB record page.

Tungsten deposits occur in association with metamorphic rocks and granitic igneous rocks throughout the world.

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).

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)

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).

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).

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).

...TRACES ARE FOUND IN SEAWATER.|SURFACE WATER: The concn of tungsten in the waters of the Mississippi river and its tributaries was <0.2 ug/l for sampling dates, Jul-Aug 1987, Nov-Dec 1987, and May-Jun 1988(1). Seawater analysis performed in the United Kingdom showed that tungsten concns were of the order of 0.1 ug/l(2). The concn of tungsten in Pacific Ocean waters is much lower, ca 0.008 ppb, since tungsten is removed more rapidly by adsorption onto ferric hydroxide, manganese oxide, and clay minerals(2).

The mean concn of tungsten in onions from Danish agricultural crops was 16.7 ug/kg (fresh weight; range, 6.3-39 ug/kg)(1).

LARGE AMT OF DUST...RELEASED FROM CRUSHING AND MILLING OF ORES... IN LOADING AND EMPTYING FROM FURNACES OF GRAPHITE BOATS... DUST MAY BE PRODUCED DURING MIXING OF COMPONENTS AND ALSO IN SHAPING AND GRINDING OF PRODUCTS.

Serum 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).

3. 3= MODERATELY TOXIC: PROBABLE ORAL LETHAL DOSE (HUMAN) IS 0.5-5 G/KG, BETWEEN 1 OUNCE & 1 PINT (OR 1 POUND) FOR 70 KG PERSON (150 LB). /TUNGSTEN & ITS SALTS/

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.

Basic treatment: Establish a patent airway. Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if needed. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for pulmonary edema and treat if necessary ... . Monitor for shock and treat if necessary ... . Anticipate seizures and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with normal saline during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool ... . Cover skin burns with dry sterile dressings after decontamination ... . /Poison A and B/|Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious, has severe pulmonary edema, or is in respiratory arrest. Positive pressure ventilation techniques with a bag valve mask device may be beneficial. Monitor cardiac rhythm and treat arrhythmias as necessary ... . Start an IV with D5W /SRP: "To keep open", minimal flow rate/. Use lactated Ringer's if signs of hypovolemia are present. Watch for signs of fluid overload. Consider drug therapy for pulmonary edema ... . For hypotension with signs of hypovolemia, administer fluid cautiously. Watch for signs of fluid overload ... . Treat seizures with diazepam (Valium) ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Poison A and B/

sodium tungstate

Grades: technical; CP; crystalline /Dihydrate/

All other chemical product and preparation manufacturing|Sodium tungsten oxide (Na2WO4): ACTIVE|SODIUM TUNGSTATE IS DERIVED FROM TUNGSTEN CARBIDE AFTER IT IS REACTED WITH MIXT OF NANO3 & NAOH.

NIOSH Method 7074. Determination of Tungsten by Flame Atomic Absorption. This method is applicable to air samples. Detection limit = 0.100 mg/cu m (insoluble). Detection limit = 0.050 mg/cu m (soluble).|EAD Method 1620-D. Metals by Inductively Coupled Plasma Atomic Emission Spectroscopy and Atomic Absorption Spectroscopy. This method is applicable to 42 elements for semiquantitative ICP screen. Detection limit = 1.0 mg/l.|PHOTOMETRIC METHOD FOR DETERMINING TUNGSTEN & ITS COMPD IN AIR.|ANALYTE: TUNGSTEN; MATRIX: AIR; RANGE: 5-2000 UG/CU M; PROCEDURE: FILTER COLLECTION, ACID DIGESTION, ICP-AES ANALYSIS. /TUNGSTEN/|For more Analytic Laboratory Methods (Complete) data for SODIUM TUNGSTATE (7 total), please visit the HSDB record page.

Spectrophotometric method for quant determination of tungsten and molybdenum in presence of each other in trace amt expected in biol samples.