INSTD: A Computer Program to Perform Internal Standard Calculations for Isotopic Ratio Mass Spectrometric Data Using General Solutions to the Equations

摘要

A computer code has been developed to perform internal standard calculations on isotopic ratio mass spectrometric data. Solutions to be relevant algebraic equations are completely general and applicable to any element. The program incorporates two methods of bias calculation: one is through analytical solution of the equations and the other through an iterative process. Derivation of the equations is outlined, and examples of results are given. Also discussed is an attempt to incorporate calculation of unspiked sample bias into the calculations. 9 refs., 3 tabs. (ERA citation 11:009437)