摘要
应用多收集器等离子体质谱,采用双分馏系数内部校正法对国际标样Shin-EtsuJN di-1和实验室标样Nd-GIG的143Nd/144Nd比值进行了为期3个月的测量统计,结果分别为0.512121±0.000011(2σ,SD)、0.511531±0.000010(2σ,SD)。采用单分馏系数外部校正法对Nd-GIG标样的测量统计结果为0.511522±0.000008(2σ,SD)。测量结果在分析误差范围内与其推荐值或表面热电离质谱测量值完全一致。对m(Ce)/m(Nd)约为0.10的两份Nd-GIG混合样进行了测量,结果表明,利用多收集器等离子体质谱可直接分析残留铈的样品,其测量结果在误差范围内。
s: Mass fractionations in the measurement of 143Nd /144Nd isotopic ratio by a multicollector inductively coupled plasma mass spectrometer (MCICPMS) are mass dependent. Two correction methods of (1) double fractionation internal correction (DFIC) and (2) single fractionation external correction (SFEC) were defined and applied to the mass fractionation. The results for a threemonth measurement on 143Nd/144Nd ratios by DFIC method for the international standard sample ShinEtsu JNdi1 and internallaboratory neodymium isotopic reference NdGIG are 0.512?121±0.000?011 (2σ SD) and 0.511?531±0.000?010 (2σ SD) respectively. While the 143Nd/144Nd ratios measured by SFEC method for the NdGIG is 0.511?522±0.000?008 (2σ SD). These results are accordant with their recommended or TIMS measured values within permissible analytical error. Measurements for two NdGIG contaminated cerium mixtures with m(Ce)/m(Nd)<0.10 reveal that the measured 143Nd/144Nd ratios agree with its recommended or TIMS values within permissible analytical error. The results also show that the correction methods studied in this paper are efficient for precise and accurate 143Nd/144Nd ratio measurements in geological rock samples, even with contaminant of cerium by using single focusing MCICPMS.
出处
《岩矿测试》
CAS
CSCD
北大核心
2002年第4期247-251,共5页
Rock and Mineral Analysis
基金
中国科学院知识创新重大科研项目(KZXC2-101
KZXC2-102)
国家自然科学基金(49903006)
关键词
多收集器电感耦合等离子体质谱
质量分馏
校正方法
钕同位素
地球科学
multicollector inductively coupled plasma mass spectrometer(MCICPMS)
mass fractionation
correction methods for mass bias
143Nd/144Nd isotopic ratio
