【摘要】 研究了氟化钠－氯化亚锡还原磷钼蓝光度法测定钢铁中磷的方法的稳定性问题，发现了其吸光度随时间变化的规律，研究了该变化规律的影响因素，用实验方法探讨了其吸光度变化的原因，得到了较肯定的结论为该测定方法的改进奠定了基础。更多还原

【Abstract】 stability of phosphomolybdate blue reduced with sodium fluoride-stannous chloride for determination of phosphoim in iron and steel by spectrophotometry has been studied.The regularity of absorbance change along with time gone on was observed.The factors effecting on the regularity and the mechanism of absorbance change have been investigated in detail. The improved method is proposed in this paper.更多还原