FRSC 367 Lecture Notes - Lecture 7: Nondestructive Testing, Thermal Conductivity, Diatomaceous Earth
15 Oct 2016
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Steps: the sample is evaporated (not decomposed) and injected onto the head of a chromatographic column (pre-heated to 300 degrees celsius, a detector is used for analysis. Mobile phase (inert gas- hydrogen and helium) pick the material and move it through the column and stationery phase (does not interact with molecule of the analyte) Stationary phase: liquid phase immobilized on the surface of an inert solid. Desirable properties for stationary phase in a gas-liquid chromatography include: low volatility (b. p. of the liquid should be at 100 for the column so that it doesn"t evaporate quickly. C higher than the maximum operating temperature thermal stability: chemical inertness, degree of solubility: a species must show some degree of compatibility (solubility) with the stationary phase. Calibration graph of a series of standards of known concentration plotting area under peak vs concentration. The detector signal from a gas-liquid chromatographic column has had wide use for quantitative and semiquantitative analyses.
