“…Hydrocarbons. Atmospheric polycyclic aromatic hydrocarbons have been determined by various chromatographic techniques: thin-layer chromatography, gas-liquid chromatography, UV-spectrophotometry, and spectrofluorometry for qualitative studies (224); chromatographic methods have been compared and reviewed (1214); thin-layer chromatography on silica gel (1077) and alumina (1213); high-temperature paper chromatography (874); hydrocarbons from cigarette smoke by high-resolution liquid chromatography (807); methyl-substituted anthracenes as fluorescent indicators in the presence of olefins (1292).…”