2,6-二溴-4-甲基偶氮磺分光光度法测定钕铁硼合金中的钕

DETERMINATION OF Nd IN Nd-Fe-B ALLOY BY 2,6-DIBROMO-4- METHYL SULFONAZO SPECTROPHOTOMETRY

研究2，6-二溴-4-甲基偶氮磺(DBM—SA)与钕(Ⅲ)的显色反应，建立了测定钕铁硼合金中钕的分光光度分析方法。在2mol／L磷酸介质中，钕(Ⅲ)与DBM-SA发生灵敏的显色反应，生成配合比为1：2的蓝色配合物，其最大吸收波长为634nm，表观摩尔吸光系数为1．0×10^5L／(mol·cm)。钕(Ⅲ)的浓度在0～1．0μg/mL内符合比耳定律。该方法用于实际样品分析，加标回收率为97．6％-99，8％，测定结果的相对标准偏差为0．65％～0．82％。

The color reaction between Nd(Ⅲ) and 2,6-dibromo-4-methyl sulfonazo (DBM-SA) was studied. DBM-SA reacts with Nd(Ⅲ) to give a 1:2 blue complex in a phosphoric acid media. The maximum peak is at 634 nm with an apparent molar absorptivity of 1.0×105 L/(mol.cm). Beer's law was obeyed in 0 - 1.0μg/mL of Nd(Ⅲ). For the determination of the real sample, the recovery is 97.6% -99.8% and the relative standard deviation is 0.65% -0.82%.