电感耦合等离子体质谱法测定碳化硼中的硼同位素丰度  

Determination of Abundance of Boron in Boron Carbide Samples with MC–ICP–MS

作　　者：朱留超[1] 赵永刚[1] 鹿捷 张燕[1] 李力力[1] 徐常昆[1] 赵兴红[1] 王同兴[1] 姜小燕[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《化学分析计量》2015年第5期23-26,91,共5页Chemical Analysis And Meterage

摘　　要：以碳酸钙为熔剂高温分解，硝酸浸取、硫酸沉淀的方法处理碳化硼样品，稀释后直接进行多接收电感耦合等离子体质谱分析，对碳化硼中的硼同位素丰度进行测定。扫描电镜分析结果表明，碳化硼颗粒形状不规则，尺寸小于50μm。利用建立的方法处理样品，可实现碳化硼样品的完全溶解，回收率接近100％。对样品中^10B丰度进行分析，相对标准偏差为0．023％-0．035％（n=6），测量结果与参考值在不确定度范围内保持一致，证明实验方法可行。所建立的碳化硼样品测量方法样品处理步骤简便，分析速度快，测量精度高，可作为碳化硼中硼同位素丰度的常规分析方法。A method was developed for the abundance analysis of boron in boron carbide samples by multi-collector inductively coupled plasma mass spectrometry（MC-ICP-MS）. The samples were melted with calcium carbonate in muffle furnace, and then dissolved in nitric acid, finally sulfuric acid was added to precipitate the calcium. The particle of boron carbide was analysized by scan electron microscope（SEM）. The results showed that the particle shape of boron carbide particle distributed anomaly and the size was less than 50μm. By this method, the boron carbide samples were dissolved entirely and the recovery of whole procedure was approached to 100%. The measurement results of ~~B abundance obtained were in good accordance with reference value within their expanded uncertainty, which proved the feasibility of the experiment method. The relative standard deviations were 0.023%-0.035%（n=6）. The method developed can be applied for the abundance analysis of boron in boron carbide, which have the advantage of simple pretreatment of sample, fast analysis and high measurement precision.

关 键 词：硼同位素丰度分析 碳化硼 多接收电感耦合等离子体质谱 

分 类 号：O657.63[理学—分析化学]