Yu L L, Vocke R D, Murphy K E, Beck C M
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8391, USA.
Fresenius J Anal Chem. 2001 Aug;370(7):834-7. doi: 10.1007/s002160100888.
Standard reference material (SRM) 2584 (Trace Elements in Indoor Dust) was developed as a reference standard for evaluating field methods and for validating laboratory and reference methods for the assessment of lead contamination and exposure. In addition to lead, the toxic trace elements As, Cd, Cr, and Hg, at approximately 17, 10, 140, and 5 microg g(-1), respectively, have been certified in the SRM. These four analytes were successfully determined by use of high-resolution inductively coupled plasma mass spectrometry (HR-ICP-MS). Isobaric interferences at masses of As and Cr were resolved by using the high resolution mode (nominal 8000) and the medium resolution mode (nominal 3000), respectively, of the instrument. The effects of a significant drift in analyte sensitivity in the course of measurement were rectified by use of internal standardization, single spike standard addition, and an optimized analysis sequence. The results were compared with those obtained by instrumental neutron activation analysis (INAA) and isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS). The results for the quality control, SRM 2704 (Buffalo River Sediment), were in good agreement with the certified values, indicated by the uncertainty intervals of the measured values overlapping the certified intervals at 95% confidence level.
标准参考物质（SRM）2584（室内灰尘中的微量元素）被开发用作评估现场方法以及验证用于评估铅污染和暴露的实验室及参考方法的参考标准。除铅之外，SRM中还对毒性微量元素砷、镉、铬和汞进行了定值，其含量分别约为17、10、140和5微克/克。通过使用高分辨率电感耦合等离子体质谱法（HR-ICP-MS）成功测定了这四种分析物。分别利用仪器的高分辨率模式（标称8000）和中分辨率模式（标称3000）解决了砷和铬质量数处的同量异位素干扰问题。通过使用内标法、单标样标准加入法和优化的分析序列，校正了测量过程中分析物灵敏度的显著漂移。将结果与通过仪器中子活化分析（INAA）和同位素稀释电感耦合等离子体质谱法（ID-ICP-MS）获得的结果进行了比较。质量控制标准参考物质SRM 2704（布法罗河沉积物）的结果与认定值高度一致，测量值的不确定区间与95%置信水平下的认定区间重叠即表明了这一点。
