Co‐solvent effects for preventing broadening or loss of early eluted peaks when using concurrent solvent evaporation in capillary GC. Part 2: <i>n</i>‐Heptane in <i>n</i>‐pentane as an example

Abstract

Abstract Co‐solvent effects are applied to allow use of concurrent solvent evaporation for applications requiring analysis of compounds eluted less than some 50° above the column temperature during sample introduction, i.e. at oven temperatures below some 100–120°C. Required conditions such as GC even temperature, concentration of the co‐solvent and length of the uncoated pre‐column (retention gap) are studied theoretically as well as experimentally for the case of n ‐heptane as co‐solvent in n ‐pentane.