What is gas chromatography and liquid chromatography? Gas chromatography is a chromatographic method that uses gas as a mobile phase. The sample flows through the gas system and is gasified before ...

Isotope dilution is used to determine the quantity of a chemical substance in a sample. In this method, isotopically enriched material is added to a sample which leads to a "dilution" of the standard.

THE application of gas-liquid partition chromatography to the microanalytical separation of steroids has been recognized for some time as an attainable goal. The chief barrier to practical advances in ...

Thin-layer chromatography (TLC) was widely used in the 1960s and 1970s for pesticide residue analysis, but only to a limited extent since gas–liquid chromatography (GLC) and high performance liquid ...