微波消解-电感耦合等离子体质谱测定口红中的铅

An analytical method based on microwave digestion and ICP-MS detection was developed for the determination of lead in lipsticks. The conditions of the digestion were optimized by different mix-acid and sample weight, 0.2 g sample and a mixture of HNO₃＋HF＋H₂O₂ was found available. Its accuracy and precision were evaluated by GBW(E)090028 and two lipsticks. The results indicated that microwave-ICP-MS is accurate, sensitive and short of analytical cycle, which can meet the demand for the determining lead in lipsticks.     

红酒中痕量元素分析方法研究

The contents of lead, iron, copper in red wine were determined by using ICP-MS, ICP-OES, and an authoritative measurement method-isotope dilution mass spectrometry (IDMS). The results indicated that it was not easy to achieve agreements with IDMS by using common methods. If using some methods, such as matrix mathing and adding standards to reduce the inference of matrix, the results could be better. So it is necessary to use similar certified reference material to calibrate the method and correct the results when the complex matrix samples were measured.     

摩尔质量测量的中国贡献

中国计量科学研究院(NIM)自2012年参加阿伏伽德罗常数测定中浓缩硅摩尔质量测量国际合作研究,首次提出并建立了硅同位素丰度比的高分辨质谱测量方法,先后完成了浓缩硅和超浓缩硅摩尔质量的测量研究。尤其在超浓缩硅摩尔质量测量的国际比对中,NIM是参加比对的8个国家计量院中唯一一个同时采用了两种测量方法的计量院,而且两种方法所得结果最优,为超浓缩硅摩尔质量的准确测量以及阿伏伽德罗常数的准确测定提供了坚实的数据支撑,在新一轮国际单位制单位的重新定义活动中做出了中国计量院的贡献。     

铕浓缩同位素全蒸发-1012Ω高阻信号放大器的热电离质谱分析方法

浓缩同位素是校正质谱法、同位素稀释质谱法和双稀释剂法等同位素质谱分析技术的基础,其化学纯度及丰度量值的准确性直接影响着分析结果的准确性。但由于浓缩同位素中低丰度同位素的离子信号较难准确测量,且缺乏合适的标准物质校正,给高精准的同位素丰度分析带来挑战。本文建立了适用于微量铕浓缩同位素样品纯化的锌还原-萃取色层法,纯化后的151 Eu和153 Eu两种浓缩同位素纯度优于99.99%,有效消除了其他稀土元素杂质的干扰。通过采用1012Ω信号放大器的法拉第杯接收样品中的低丰度同位素离子信号,建立了铕浓缩同位素的全蒸发-热电离分析方法。两种浓缩同位素样品的主丰度测量结果分别为151 Eu 0.9683676(11)和153 Eu 0.9876851(21),测量重复性比1011Ω信号放大器的法拉第杯以及文献中校正质谱法的测量结果提高了3倍。