摘要
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．
The method for spectrophotomtric determination of Barium based on colour reaction of Barium with Dibromcarboxychlorophosophonazo has been established. The maximum absorption of the complex is at 640nm. The linear range is 0.2~0. 52mg/L. Its molar absorptivity is 1. 52 ×104 L·mol-1·cm-1. The method has been applied to determination of Barium in Siliun-Barium-Iron alloy with satistactory results.
