title: Styrene copolymers as pollutant adsorbents. Safe sampling volume determination.
abstract: The determination of safe sampling volumes of benzene and acetone on air samplers filled with Porapak Q, Chromosorb 101, 102 and 103 is described. Two direct methods are employed; one method is based on frontal chromatography, while the second one is a concentration method followed by thermal desorption. The results are compared to those determined by the indirect pulse chromatographic method. The safe sampling volumes determined by the direct methods were in accordance. The indirect method gives slightly different values; however, this procedure is carried out at "infinite dilution". The effect of the pollutant concentration on the safe sampling volumes was also examined. The values decrease with increasing pollutant concentration.
mesh_terms: D000096:Acetone / Q000302:isolation & purification; D000327:Adsorption; D000393:Air Pollutants / Q000302:isolation & purification*; D001554:Benzene / Q000302:isolation & purification; D002849:Chromatography, Gas; D011137:Polystyrenes; D012997:Solvents
chemical_list: D000393:Air Pollutants; D011137:Polystyrenes; D012997:Solvents; D000096:Acetone; C024075:styrofoam; D001554:Benzene