Abstract
A well-known method of quantitative chromatographic analysis—the double internal standard method—is modified. This modification consists in the use of two analyte homologs (preceding and following ones) as standard substances. This approach can be used to compensate for considerable losses of both test components and standard substances in the course of various sample preparation procedures. The advantages of this method are illustrated using liquid extraction, vapor-phase analysis, distillation of volatile components with volatile solvents (preconcentration in a condensate), and evaporation of volatile solvents (preconcentration in a distillation residue) as examples. The method proposed maintains a high precision of determinations (the relative error (c specified − c found)/c specified is 1–6%).
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