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利用二溴邻羧基偶氮氯膦与钡的络合反应，建立了光度法测定钡的方法．测量波长λmax＝640nm，线性范围0．2～0．52mg／L，摩尔吸光系数为1．52×104．可用于硅钡铁合金中钡的测定．
A spectrophotometric method for the determination of barium was developed by the complex reaction of dibromocarboxylazophosphonazo with barium. The measurement wavelength λmax = 640nm, the linear range of 0.2 ~ 0.52mg / L, the molar absorption coefficient of 1.52 × 104. It can be used for the determination of barium in silicon barium iron alloy.