High-precision measurement of calcium isotopes in carbonates and related materials by multiple collector inductively coupled plasma mass spectrometry (MC-ICP-MS)

被引：116

作者：

Halicz, L ^{[1
]}

Galy, A

Belshaw, NS

O'Nions, RK

机构：

[1] Univ Oxford, Dept Earth Sci, Oxford OX1 3PR, England

[2] Geol Survey Israel, IL-95501 Jerusalem, Israel

来源：

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY | 1999年 / 14卷 / 12期

关键词：

D O I：

10.1039/a906422b

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Multi-collector ICP-MS has been used for the precise measurement of natural variations in the isotopic composition of Ca. The interference of Ar in the Ca mass region is assessed and the repeatability of the Ca-44/Ca-42 ratio of a sample calcium solution relative to the National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 915a Calcium Carbonate (Clinical) standard is better than 0.1 parts per thousand at 95% confidence. Variations in sample Ca-44/Ca-42 ratio are expressed as delta(44)Ca units, which are deviations in parts per 10(3) from the same ratio in the NIST SRM 915a Ca standard. Measurements of delta(44)Ca are presented for terrestrial and marine carbonates, which show a variation of up to 0.7 parts per thousand, in agreement with previous studies by thermal ionisation mass spectrometry (TIMS).

引用

页码：1835 / 1838

页数：4

共 12 条

[1] A new variable dispersion double-focusing plasma mass spectrometer with performance illustrated for Pb isotopes [J].