乙醇增强-电感耦合等离子体质谱法直接测定地质样品中碲

Direct Determination of Tellurium by Inductively Coupled Plasma Mass Spectrometry with Ethanol as a Signal Enhancer

建立了HF -HNO3密封酸溶以及Na2 O2 熔融处理样品 ,乙醇增强灵敏度 ,电感耦合等离子体质谱直接测定地质样品中微量和超痕量碲的方法。样品溶液中加入乙醇 ( φ =4%) ,在0 .85L/min的载气流速下 ,碲信号可增强 2 .5倍以上。碲的方法检出限 ( 1 0σ,DF =1 0 0 0 )为0 .0 2 μg/ g。用土壤和水系沉积物国家一级标准物质验证了方法的准确度 ,标准物质的绝大多数分析结果与标准值的误差在允许范围内。分析了大洋多金属结核样品及深海沉积物样品中的微量碲 ,结果与其他方法相符 ,精密度试验RSD(n =3) <1 0 %。

A method for the direct determination of Te in geological samples by inductively coupled plasma mass spectrometry using ethanol as signal enhancer is described. Closed digestion method or Na 2 O 2 fusion method was used for soil, sediment and oceanic polymetallic nodule sample decomposition. Te in sample solution is directly determined by ICP MS and the sensitivity of Te can be enhanced by a factor of 2.5 when 4% ethanol is added. The detection limit of Te is 0.02 μg/g and the validity of the method was examined by analyzing several geological reference materials. Most results are found to be in reasonable agreement with certified values with precision of less than 10% RSD( n =3).