【摘要】 研究了新显色剂二溴对甲基偶氮甲磺光度测定铈组稀土总量的方法。在酸性介质中,试剂与以铈组稀土为代表的稀土形成蓝色配合物,在644nm有最大吸收,铈含量在0～15μg/25ml范围内符合比耳定律。方法应用于钢铁中铈组稀土总量的直接测定,发现其准确性和重视性良好。更多还原

【Abstract】 A spectrophotometric method for the determination of cerium subgroup rare earths with a new chromogenic reagent dibromo-p-methyl-methylsulfonazo is studied. In acid medium, cerium reacts with the reagent to form a blue complex which has an absorption maximum at 644nm. Beer’ s law is obeyed for 0~15μg of cerium in 25ml solution. The method has been applied to the direct determination of cerium subgroup rare earths in steels with satisfactory accuracy and precision.更多还原