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Single isotope ratio precision

It should be taken into account, however, that the isotope ratio precision is typically worse than that with pneumatic nebulization as a means of sample introduction. Recently, Aramendia et al. provided a description of strategies to improve the isotope ratio precision attainable with the combination of LA and single-collector ICP-MS [62]. As the use of LA also affects the degree of mass discrimination, matrix-matched standards are required for adequate mass bias correction [63],... [Pg.51]

Isotope Ratio Precision with Single-Collector ICP-MS... [Pg.59]

Instrumental developments (e.g., of sector field instruments with multiple ion collection, introduced in 1992, or the insertion of collision and reaction cells in order to reduce disturbing isobaric interferences), the progress in applications for ultratrace analysis, also in combination with on line hyphenated separation techniques (HPLC, CE), especially routine capability as well as decreasing price and user friendly maintenance mean that sales are increasing by 10 % every year. To improve the analytical performance of ICP mass spectrometers for precise isotope ratio measurements (e.g., for geochronology or for the study of fine isotope variation in nature) powerful instrumentation with high mass dispersion and multiple ion collector systems instead of single ion collection are commercially available on the analytical market. [Pg.120]

Of all the different mass spectrometric techniques for isotope analysis (such as ICP-MS, LA-ICP-MS, TIMS, GDMS, AMS, SIMS, RIMS and isotope ratio mass spectrometry of gases), the greatest proportion of pubhshed papers today concern ICP-MS with single and multiple ion collection.19 Due to its benefits, ICP-MS has now become a widely accepted method for isotope analysis and allows isotope ratios to be measured in a short time with good accuracy and precision.9,19,75 78 As discussed above, as a powerful and universal tool, ICP-MS has opened up new applications for isotope ratio measurements of elements with a high first ionization potential, which are difficult to analyze with TIMS (such as Mo, Hf, Fe). Of all the heavy metals studied, uranium was favoured by ICP-MS and LA-ICP-MS. [Pg.228]

The results of uranium isotope ratio measurements by MC-TIMS (TRITON Thermo Fisher Scientific) on a single uranium oxide reference particle (10 pan) are illustrated in Figure 8.5.9,144 The high precision of multiple ion counters and high detection power in the MC-TIMS are... [Pg.237]

The significance of inorganic mass spectrometry in precise isotope ratio measurements will be further increased for sector field mass spectrometers with multiple ion collector systems and also for mass spectrometers with single ion detection or quadrupole based instruments with and without a collision cell. [Pg.461]


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