Toxic Exposure of Tungsten Oxide
Tungsten compounds include tungsten oxide cause irritation of the upper respiratory tract and deep respiratory tract of a person, bronchial asthma and gastrointestinal dysfunction caused by dust. It has a stimulating effect on the skin, causing small nodules and scales to appear on the skin.
In the United States, the maximum allowable concentration of tungsten and soluble tungsten compounds (calculated as tungsten) is 1mg/m3, and insoluble tungsten compounds (calculated as tungsten) is 5mg/m3. Operators should use protective measures such as wearing gas masks, gloves, glasses, and dustproof clothing. Prevent dust leakage during use. Workers have to undergo pre-employment physical examinations and regular inspections.
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Ammonium paratungstate (APT) is white crystalline powder, insoluble in water.
Ammonium metatungstate is white powder, soluble in water, solubility is 300g WO3/100ml H2O (in 25℃).
Sodium tungstate is an intermediate tungstate produced from tungsten concentrate, is the raw material for APT.