The accurate determination of sulfate ions in precious metal alloy electroplating wastewater is of great significance.This study establishes a gravimetric method for analyzing sulfate ions in precious metal alloy electroplating wastewater.Through a series of condition optimization experiments,ammonium hydroxide hydrochloride was identified as the reagent for interference removal,along with the optimal amounts of ammonium hydroxide hydrochloride,barium chloride,and sample volume.Under optimal conditions,the spiked sample recovery rate of this method is 99.33 %-101.07 %,with a relative standard deviation of 0.27 %-3.42 % for the determination results.The spiked sample recovery rate and precision meet the requirements for analytical testing.