What is it about?
We measured Os isotopes using static Faraday cups with 1013 Ω amplifiers in negative thermal ionization mass spectrometry (NTIMS) and compared the results with those obtained with 1011 Ω amplifiers and by peak‐hopping on a single secondary electron multiplier (SEM). We analysed large loads of Os (1 μg) at a range of intensities of 187OsO3 (0.02–10 mV) in addition to small loads of Os (5–500 pg) to compare the results of the three methods.
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Why is it important?
The results show that both the accuracy and the precision determined using the 1013 Ω amplifiers and the SEMare identical when the Os amounts are within 10–50 pg. However, the former analysis time can be shortened by approximately two‐thirds. The SEM measurement is still the most precise method for Os amounts <10 pg, but the analyses using 1013 Ω amplifiers suggest they are significantly better than the SEM for Os amounts >50 pg.
Perspectives
This study reports a detailed procedure to measure Os isotopic ratios with high precision using static Faraday cups with 1013 Ω amplifiers. Our results indicate that both the accuracy and the precision obtained using the 1013 Ω amplifiers and the SEM are identical when the Os amounts are within 10–50 pg, but the former measurement time can be shortened by approximately two‐thirds. Our results indicated that a small amount of Os, i.e., 10–500 pg, can be quickly and accurately determined by static Faraday cups with 1013 Ω amplifiers. In addition, the consistency of accuracy and precision obtained for 1011 Ω amplifiers, the SEM, and a combination of 1013 and 1012 Ω amplifiers indicates the potential availability and flexibility of mixed amplifier configurations.
guiqin wang
Guangzhou Institute of Geochemistry, CAS
Read the Original
This page is a summary of: A comparison using Faraday cups with 1013
Ω amplifiers and a secondary electron multiplier to measure Os isotopes by negative thermal ionization mass spectrometry, Rapid Communications in Mass Spectrometry, September 2017, Wiley,
DOI: 10.1002/rcm.7943.
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