plasma source mass spectrometry;
Fe-isotopes;
stable isotope;
D O I:
10.1016/S1387-3806(99)00245-6
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:
Multiple-collector inductively coupled plasma mass spectrometry has been used for the precise measurement of natural variations in the isotopic composition of Fe. The contributions of Ar-O and Ar-N molecular species to the mass spectrum in the Fe mass region are minimised and the repeatability of the Fe-57/Fe-54 ratio of a sample Fe solution relative to the IRMM-14 Fe isotope standard is better than 100 ppm at 95% confidence. Variations in sample Fe-57/Fe-54 ratio are expressed as epsilon(57)Fe units, which are deviations in parts per 10(4) from the same ratio in the IRMM-14 Fe isotope reference standard. Measurements of epsilon(57)Fe are presented for samples of meteoritic iron and terrestrial Fe-oxides and carbonates. (C) 2000 Elsevier Science B.V.