A method for measuring cadmium isotopes in cadmium-containing samples

Abstract

The invention provides a method for measuring cadmium isotopes in a cadmium-containing sample. The method comprises the steps: firstly, testing a to-be-measured cadmium-containing sample by multi-receiving plasma mass spectrometry, to obtain signals of cadmium isotopes with the mass numbers of 110, 111, 112, 113, 114 and 116, signals of tin isotopes with the mass numbers of 117 and 120, a signal of a palladium isotope with the mass number of 105 and a signal of an indium isotope with the mass number of 115; then, obtaining signals of interference elements 110Pd, 114Sn and 113In by the signal at the mass number of 105, the signal at the mass number of 120, the signal at the mass number of 117 and the signal at the mass number of 115, substituting the signals into the step 1), and carrying out signal deducting, to obtain corrected 110Cd, 113Cd and 114Cd signals. The experimental results show that the method provided by the invention can correct measurement interference of palladium, indium and tin on the cadmium isotopes when the Sn / Cd ratio is less than or equal to 0.5, the In / Cd ratio is less than or equal to 0.001 and the Pd / Cd ratio is less than or equal to 0.0001 in the to-be-measured sample, cadmium isotope measurement cannot be affected, and the precision and accuracy of cadmium isotope measurement are improved.

Description

technical field [0001] The invention relates to the field of isotope testing, in particular to a method for measuring cadmium isotopes in cadmium-containing samples. Background technique [0002] During the isotope test, some isobaric residues in the isotope system will directly affect the isotope instrumental measurement. Due to the large mass number span of cadmium element, there are 8 stable isotopes, which are 106 Cd, 108 Cd, 110 Cd, 111 Cd, 112 Cd, 113 Cd, 114 Cd and 116 Cd; It also has many isobaric isotopes, which is easy to interfere with the instrument test of cadmium isotopes. For example, 110 Pd, 113 In, 114 Sn respectively will be 110 Cd, 113 Cd and 114 Cd test results have a direct impact. Therefore, in the process of testing Cd isotopes, it is necessary to quantitatively evaluate the influence of interfering elements on its test. [0003] Cloquet et al. (2005) performed a series of tin addition experiments to assess the effect of tin on cadmium ...

AI Technical Summary

Problems solved by technology

However, the study did not test whether tin interference can be corrected, nor did it give a method for correcting tin interference

In addition, there is currently no method for correcting for the influence of the interfering elements palladium and indium on the cadmium isotope test

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