Isotope-ratio measurements of lead in NIST standard reference materials by multiple-collector inductively coupled plasma mass spectrometry

被引:44
作者
Platzner, I [1 ]
Ehrlich, S [1 ]
Halicz, L [1 ]
机构
[1] Geol Survey Israel, Dept Geochem, IL-95501 Jerusalem, Israel
关键词
D O I
10.1007/s002160100875
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The capability of a second-generation Nu Instruments multiple collector inductively coupled plasma mass spectrometer (MC-ICP-MS) has been evaluated for precise and accurate isotope-ratio determinations of lead. Essentially the mass spectrometer is a double-focusing instrument of Nier-Johnson analyzer geometry equipped with a newly designed variable-dispersion ion optical device, enabling the measured ion beams to be focused into a fixed array of Faraday collectors and an ion-counting assembly. NIST SRM Pb 981, 982, and 983 isotopic standards were used. Addition of thallium to the lead standards and subsequent simultaneous measurement of the thallium and lead isotopes enabled correction for mass discrimination, by use of the exponential correction law and Tl-205/Tl-203 = 2.3875. Six measurements of SRM Pb-982 furnished the results Pb-206/Pb-204 = 36.7326(68), Pb-207/Pb-204 17.1543(30), Pb-208/Pb-204 36.7249(69), Pb-207/Pb-206 = 0.46700(1), and Pb-208/Pb-206 0.99979(2); the NIST-certified values were 36.738(37), 17.159(25), 36.744(50), 0.46707(20), and 1.00016(36), respectively. Direct isotope lead analysis in silicates can be performed without any chemical separation. NIST SRM 610 glass was dissolved and introduced into the MC-ICP-MS by means of a micro concentric nebulizer. The ratios observed were in excellent agreement with previously reported data obtained by TIMS and laser ablation MC-ICP-MS, despite the high Ca/Pb concentration ratio (200/1) and the presence of many other elements at levels comparable with that of lead. Approximately 0.2 mug lead are sufficient for isotope analysis with ratio uncertainties between 240 and 530 ppm.
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页码:624 / 628
页数:5
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