disclosed is a method for separating a plurality of different chemicals in a sample . the method uses a hexyl - bonded stationary phase composition in reversed - phase liquid chromatography . the composition includes a polymer - based chromatographic support composed of chemically stable and porous particles having a surface . the surface of said particles having hexyl - phenyl bonded thereto . a chromatography column is packed with this composition and a sample including a plurality of different chemicals is injected . liquid is applied to force the sample through the column , whereby said different chemicals come out of the column at different times .