Method for determining niobium content in Ti45Nb titanium alloy by using tetraphenylarsonium chloride hydrochloride weight method

The present invention discloses a method for determining the niobium content in a Ti45Nb titanium alloy by using a tetraphenylarsonium chloride hydrochloride weight method. According to the method, a test material is dissolved with hydrochloric acid, nitric acid, hydrofluoric acid and tartaric acid, a tetraphenylarsonium chloride hydrochloride completely reacts with the niobium in the test material to generate a diniobium pentoxide precipitate, the diniobium pentoxide precipitate is washed with a washing agent, the washed diniobium pentoxide precipitate is placed into a porcelain crucible, ignition is performed for 30 min at a temperature of 900 DEG C, repeated ignition is performed to achieve a constant weight, and the mass fraction of the niobium in the Ti45Nb titanium alloy is calculated according to the mass value in the constant weight state. According to the present invention, the mixed acid of hydrochloric acid, nitric acid and hydrofluoric acid is used to dissolved the insoluble Ti45Nb titanium alloy