Method for measuring lead content in casting lead brass lead washing bath solution

The invention relates to a method for measuring the content of lead in a casting lead brass lead washing bath solution, which comprises the following steps of: sequentially filtering and removing aluminum ions, zinc ions and copper ions by adopting a method of precipitating and then dissolving aiming at main interference factors of copper ions, zinc ions and aluminum ions; and finally, completely converting the residual lead sulfide precipitate into lead sulfate precipitate, adjusting the pH value, dissolving the lead sulfate precipitate, adding xylenol orange as an indicator, adding a phenanthroline aqueous solution to shield residual copper, zinc and aluminum ions, and titrating the lead ion concentration by using an EDTA standard solution. The method is suitable for measuring the concentration of trace lead ions (ppm level) in the lead washing bath solution, can achieve the effect of removing interference ions such as copper, zinc, aluminum and the like to the greatest extent while hardly losing the lead i