质谱学报2013，Vol.34Issue(2)：75-81,7.DOI:10.7538/zpxb.2013.34.02.0075
自动静态双接收高精度热电离质谱法测定硼同位素
Automatic and High-Precision Determination of Boron Isotopic Ratios Using Thermal Ionization Mass Spectrometry with Static Multi-Collection
摘要
Abstract
Due to the small relative mass difference between m/z 308 and m/z 309, simultaneous data collection was not possible using conventional multi-collection mass spectrometers. To conduct multi-collector measurements of m/z 308 (133 Cs210 BO2+) and m/z 309 (133Cs211BO2+), the Faraday cups were configured to measure m/z 308 and m/z 309 array with zoom optics. We utilize thermal ionization mass spectrometry (Trion) to perform automatic and high-precision determination of boron isotope using static multicollection of Cs2BO2+ ions. The research has been performed to investigate the impact of ion current and filament current on the accuracy and reproducibility of boron isotope measurements for NIST 951 Standard, giving values of 11B/10B were in the range of 4. 052 63-4. 053 38, when ion current varied 0. 1 -10 V and filament current varied 1 150-1 350 Ma. The phenomenon of this study was filament current. With the higher of filament current, the ion current was corresponding to be higher. Based on this discovery, we have established the conditions for precise boron isotopic measurement using the multicollection technique by automatic mode. The proposed method was used for the determination of NIST 951 H3BO3 and natural samples. The results show that the automatic mode and manual mode has same precision and accuracy. And this technique enables us to do speedy analysis of boron isotopes and greatly improve the efficiency.关键词
高精度/热电离/静态双接收/自动测定/硼同位素Key words
high-precision/ thermal ionization/ static multicollection/ automatic determination/ boron isotope分类
化学化工引用本文复制引用
贺茂勇,马云麒,金章东,马海州,张艳灵,罗重光,肖军,肖应凯..自动静态双接收高精度热电离质谱法测定硼同位素[J].质谱学报,2013,34(2):75-81,7.基金项目
国家自然科学基金(41103008)资助 （41103008）
