Phosphotungstic acid (Phosphotungstic acid), referred to as PTA, the English name is also Tungstopphosphoric Acid, referred to as TPA, is a heteropoly acid with the chemical formula H3PW12O40, usually in the form of hydrate, EPTA is the abbreviation of phosphotungstic acid ethanol solution, commonly used in biology. Phosphotungstic acid is small particles, gray or light yellow-green crystals, melting point is 89°C (24H2O hydrate), phosphotungstic acid is soluble in water (200g/100 ml), and its aqueous solution is colorless. Phosphotungstic acid has no significant toxicity and is a slightly acidic irritant.
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