钢中含有微量铅,对钢的机械性能影响很大,尤其在铸铁中,即使含有微量铅,对球化也很不利.因此迫切需要有一简便、快速、准确的测定方法.根据文献介绍,须将铁分离,其中有萃取比色,萃取极谱法等,手续均较烦,费时.最近,有资料以抗坏血酸还原三价铁,于柠檬酸氢二铵为底液,在pH≈3～4之间直接测定钢铁中的铅, Steel contains trace lead, the mechanical properties of steel great influence, especially in cast iron, even with trace amounts of lead, the ball is also very disadvantageous. Therefore, there is an urgent need for a simple, rapid and accurate determination of method. According to the literature, to be Recently, there are data to restore ferric iron ascorbate, diammonium citrate as the bottom liquid, in the pH ≈ 3 ~ 4 Between the direct determination of lead in steel,