National Institute of Standards and Technology, Material Measurement Laboratory, Chemical Sciences Division, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, USA.
Talanta. 2013 Nov 15;116:18-25. doi: 10.1016/j.talanta.2013.04.068. Epub 2013 May 9.
Cadmium was quantified at 80.15±0.86 ng/g (mean±95% expanded uncertainty) in NIST SRM 3280 Multivitamin/Multielement Tablets, using isotope dilution mass spectrometry. The method described utilized various precipitation and solid-phase extraction separation methodologies to isolate Cd from Sn and Mo, present respectively, at 11.1±0.9 mg/kg and 70.7±4.5 mg/kg in the tablet matrix. This allowed for measurement of (111)Cd/(113)Cd and (111)Cd/(114)Cd isotope ratios using both quadrupole collision cell technology inductively coupled plasma mass spectrometry (Q-CCT-ICP-MS) and sector field (SF)-ICP-MS equipped with a desolvating nebulizer system to mitigate the MoO(+) and MoOH(+) molecular ion interferences that typically affect the envelope of Cd isotopes.
采用同位素稀释质谱法，在 NIST SRM 3280 多种维生素/多种元素片剂中定量测定镉，其浓度为 80.15±0.86ng/g（平均值±95%扩展不确定度）。所描述的方法利用各种沉淀和固相萃取分离方法，从锡和钼中分离出镉，片剂基质中锡和钼的浓度分别为 11.1±0.9mg/kg 和 70.7±4.5mg/kg。这使得可以使用四极碰撞池技术电感耦合等离子体质谱（Q-CCT-ICP-MS）和配备有解吸雾化器系统的扇形场（SF）-ICP-MS 测量（111）Cd/（113）Cd 和（111）Cd/（114）Cd 同位素比，以减轻通常影响镉同位素包络的 MoO(+)和 MoOH(+)分子离子干扰。
