Quantitative Analysis by Means of Mass Spectrogrograph for Solids Part B. Theory and Discussions.

Abstract

Some methods of quantitative analysis of solids by means of mass spectrograph with spark type ion source are discussed. Relation between the number of atoms N consumed by sparking and total integrated change q falling on the monitor electrode in front of magnetic field is analyzed, and the number of ions n falling on unit area of the spectral line is shown to be given by the equation n=g(C)γ. q/A, w here C: concentration of regarded element, γ: isotopic abundance of the spectral line, A: area of the spectral line. From this equation, following methods of preparing the calibration curves are proposed.
(1)The line density D vs C curve must be used in general. Several standard samples of varying C value is necessary, and the values γ, q and A must be kept constant in this procedure.
(2)D vs γ · q · C curve may be used as the calibration curve of low concentration range of the element, provided there occur no “ matrix effects ” in ionization process. Only one standardised sample of low concentration range of the element will do in this procedure, for γ and q are variable.
(3)If there occur no “ matrix effects ”, D vs γ · q · C curve may he used as the calibration curve for the sample consists of elements which behave in the same manner in ionization process. Only one standardized sample or pure substance will do in this procedure.