Speaker: Mr. Li Pengfei, Engineer
Time: 9th November (Thursday), 2023
12:20-12:30, Sign up
12:30-12:50, Presentation
12:50-13:10, Free discussion
Location: Lecture Hall 221, Building No. 16
Abstract: High quality metal stable isotope analysis is not only affected by many factors such as laboratory temperature, humidity, chemical purification process, matrix effect, etc., but also the stability of MC-ICP-MS and instrumental test parameters. As an important part of MC-ICP-MS, the high-impedance amplifier converts and amplifies the electrical signals received by the Faraday cup into voltage values. Different high-impedance amplifiers may have tiny differences in resistance values, which need to be eliminated by the Gain calibration, thus improving the precision and accuracy of isotope analysis. However, there is a lack of systematic understanding of the principles and effects of the drift and frequency of Gain calibration on isotope analysis. Based on the Gain calibration data of Neptune Plus MC-ICP-MS and the Hg isotopic data obtained in our laboratory, this presentation evaluate the effect of the drift of the Gain calibration coefficients on isotope measurements.
