title: Phase ratio variation approach for the study of partitioning behavior of volatile organic compounds in polymer sample bags: Nalophan case study.
abstract: Sorption of volatile organic compounds on the inner surface of polymer sampling bags leads to important underestimations of the real headspace concentration. Introducing a wide range of volatiles in a two-phase system containing Nalophan revealed that recoveries decreased down to 57 % in a period of 22 h. In this work, a phase ratio variation approach is investigated to quantify the degree of scalping, and thus enabling to compensate for sorption phenomena. This method requires limited measurements, without the need for time-consuming calibrations. By spiking identical amounts of volatiles in three two-phase systems, each having unique polymer volume/mass ratios β (β 1 = 0, β 2 = 80.9, β 3 = 161.9), individual partitioning coefficients could be experimentally determined for a wide range of compounds. Additionally, a correlation was found between these partitioning coefficients and the liquid molar volume for a number of aliphatic, aromatic, and oxygenated compounds.
authors: Research Group Molecular Odor Chemistry, KU Leuven Technology Campus Ghent, Gebroeders De Smetstraat 1, 9000, Ghent, Belgium, jim.vandurme@kuleuven.be.
authors: Jim
authors: J
authors: Van Durme
authors: Bas
authors: B
authors: Werbrouck
mesh_terms: D000327:Adsorption; D004784:Environmental Monitoring / Q000379:methods*; D011093:Polyethylene Terephthalates / Q000737:chemistry*; D013048:Specimen Handling; D013499:Surface Properties; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000737:chemistry
chemical_list: D011093:Polyethylene Terephthalates; D055549:Volatile Organic Compounds