ICP-AES法测定稀土金属中的钛、钼、钨、铌和钽

针对试样特点拟定了加大称样量以减轻偏析,以浓硝酸溶解样品破坏碳化物,加入氢氟酸助溶,分离稀土基体同时络合钛、钼、钨、铌和钽的方法,无须基底匹配,采用工作曲线法成功地测定了金属镧、铈、镨、钕、钐、铕、钆、铽、镝、钇中的钛、钼、钨、铌和钽量,测定范围:0.0050%～0.50%。

Determing Method for Titanium, Molybdenum, Tungsten, Niobium and Tantalum in Rare Earth Metals

Titanium, molybdenum, tungsten, niobium and tantalum are impurities elements which are introduced in the production process.The main existent status is metal and titanium carbide, molybdenum carbide, tungsten carbide, niobium carbide, and tantalum carbide, moreover, the metal is not uniform. As this speciality,this method adopts higher sample weight to reduce the deflection, dissolves the sample by concentrate HNO_3 to decompose the carbide,HF assists dissolution, separates the rare earth base combined with the titanium, molybdenum, tungsten, niobium, and tantalum complex. It is no necessary to be base matching.Using working curve method,determined successfully the amount of titanium, molybdenum, tungsten, niobium, and tantalum in lanthanum,cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium,and yttrium metals. Determing range is 0.0050% to 0.50%.