OSMIUM ISOTOPE RATIO DETERMINATIONS BY NEGATIVE THERMAL IONIZATION MASS-SPECTROMETRY

被引：462

作者：

VOLKENING, J ^{[1
]}

WALCZYK, T ^{[1
]}

HEUMANN, KG ^{[1
]}

机构：

[1] UNIV REGENSBURG,INST ANORGAN CHEM,UNIV STR 31,W-8400 REGENSBURG,GERMANY

来源：

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES | 1991年 / 105卷 / 02期

关键词：

D O I：

10.1016/0168-1176(91)80077-Z

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

A new technique for osmium isotope ratio determinations by negative thermal ionization mass spectrometry using the formation of OsO3- ions is presented. Different filament materials and chemicals to reduce the electron work function are investigated. With Ba(OH)2 and platinum as filament material an ionization efficiency of more than 1% is obtained for nanogram sample amounts. The isotopic abundances of a laboratory standard are measured with relative standard deviations of less than 0.01% for the most abundant isotopes. This significant improvement in the precision of the osmium isotopic measurements, compared with previous investigations, provides a suitable tool to develop a Re-Os age determination method on this basis. The new isotopic data could also be used to recalculate the atomic weight of osmium to be 190.2251 +/- 0.0001, which is much better in uncertainty than the current IUPAC data.

引用

页码：147 / 159

页数：13

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