Method for determining minim plumbum of aluminium ingot

The invention relates to a measuring method for micro lead in aluminum ingot, especially to a measurement for micro lead in remelting aluminum ingot product. The method is characterized in that: measured sample is dissolved by aqua regia, oxidant is added to oxide low valence state lead ion to high valence state lead ion, sodium hydroxide solution is used to control acidity of solution, then reducing agent is added to transform lead ion in sample solution to gaseous hydride, argon gas is used as carrier gas to introduce the hydride into atom fluorescence spectrometer measurement system. The method can accurately and fast measure lead content in aluminum ingot, and is adapted for analysis of micro lead for aluminum ingot manufacturer.