【摘要】 在盐酸介质中 ,二溴对甲偶氮羧与钡形成 2∶1的络合物 ,其最大吸收波长为 60 5nm ,摩尔吸光系数ε =1 75× 1 0 4 ,形成的络合物稳定性好 ,吸光度在 48h内保持不变。显色体系具有较好的选择性 ,大量常见离子不干扰测定。钡量在 0～ 1 6μg/1 0mL范围内符合比尔定律。方法应用于铁合金中微量钡的测定 ,结果满意。更多还原

【Abstract】 In the medium of HCl, dibromo p methyl carboxyazo reacts with barium to form a 2∶1 complex, the maximum absorption exhibits at 605nm with an apparent molar absorptivity ε max = 1.75×10 4L·mol -1 ·cm -1 . The complex is stable at least for 48 hours. The method is highly selective, most foreign ions in considerable amounts are tolerable. Beer’s law is obeyed over the range from 0 to 16μg/10mL for barium. The method has been used to the determination of micro barium in ferroalloy samples with satisfactory results.更多还原