偶氮氯膦Ⅲ光度法测定稀土镁合金中稀土总量  

Spectrophotometric determination of total RE in alloy of magnesium-rare earth alloy with chlorophosphonazo Ⅲ

作　　者：龙如成[1] 孟平[1] 甘培新[1] 

机构地区：[1]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243000

出　　处：《冶金分析》2004年第1期42-43,47,共3页Metallurgical Analysis

摘　　要：试样经硝酸、氢氟酸溶解 ,高氯酸冒烟蒸干。用硫酸 -硝酸混合酸溶解盐类并控制酸度 ,草酸掩蔽干扰金属离子 ,在0 44～ 0 87mol/L的酸性介质中 ,偶氮氯磷Ⅲ与稀土定量形成蓝色络合物 ,在分光光度计 672nm波长处测量吸光度 ,表观摩尔吸光系数ε =1 76× 10 4 ,在 5 0mL溶液中 ,稀土质量在 0～ 10 0 μg范围内符合比尔定律。After dissolving the sample with nitric acid and hydrofluoric acid, perchloric acid is added and the acid mixture is evaporated till fumes of perchloric acid and dryness. The salts are dissolved with mixture of sulphuric acid and nitric acid. The interferences of some metal ions can be masked by oxalic acid. Rare earth elements react with CAPⅢ to form a blue complex in the mixture acid. The absorbance is measured at the wavelength of 672nm. The apparent molar absorptivity is 1.76×10~4mol·L^(-1)·cm^(-1). Beer's law is obeyed in the concentration range of 0-100μg/50mL for rare earth elcments.

关 键 词：稀土镁合金 稀土总量 测定 偶氮氯膦Ⅲ 光度法 

分 类 号：TG115[金属学及工艺—物理冶金]