Application of Thermal Ionization Mass Spectrometry for Measuring Atomic Weight of Dysprosium
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摘要: 用已知化学纯度的 16 2 Dy、16 4Dy两种浓缩同位素通过化学计量 ,配制人工合成校准样品 ,测量质谱计系统误差校正系数 K,校正用该仪器测量的来自地球不同地域矿物和试剂样品镝 ( Dy)元素天然同位素丰度比 ,求出自然界 Dy同位素丰度的真值。用该真值和它的核素质量 ,计算 Dy原子量 1 62 .4 995 ( 1 7)。上述测量经 IUPAC国际原子量委员会 ( UPAC-CAWIA)评审确认推荐报告中提供的测量值为 Dy原子量新的国际标准值 ,测量方法评为最佳测量Abstract: Two standard solutions of highly enriched isotopes of 162Dy and 164Dy were prepared from 162Dy and 164Dy in the form of oxides of well-defined purity. Gravimetric synthetic mixtures of two standard solutions were used to calibrate Finnigan MAT-261 Thermal Ionization Mass Spectrometer (TIMS). This instrument were used to determine isotopic abundance ratios on five natural samples of dysprosium to obtain an absolute isotope abundances of 0.056(2)at.% 156Dy, 0.095(2)at.% 158Dy, 2.329(12)at.% 160Dy, 18.889(28)at.% 161Dy, 25.475(24)at.% 162Dy, 24.896(28)at.% 163Dy and 28.260(36)at.% 164Dy. These absolute isotope abundances multiplied by their nuclear mass is equal to Dy atomic weight as 167.2591(9) with an uncertainty given on the basis of 95% confidence limit.
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[1] ChangT L ,QianQ Y,ZhaoM T
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