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Adsorption of hydrocarbons commonly found in gasoline residues on household materials studied by inverse gas chromatography
- Source :
- Journal of Chromatography A. 1594:149-159
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- The adsorption of hydrocarbons present in gasoline residues on household materials was investigated via inverse gas chromatography (IGC). A series of hydrocarbons (n-heptane, n-octane, n-nonane, toluene, p-xylene, and 1,2,4-trimethylbenzene) and three household materials (carpet fibers, cotton fabric, and cardboard) were selected in this work. IGC measurements using columns packed with these household materials were conducted to obtain molar enthalpies of adsorption of the selected hydrocarbons over the temperature range of 40 to 70 °C. Adsorption isotherms and Henry’s law solubility coefficients (S) were also determined at 40 °C. Results from our IGC measurements revealed that molar enthalpies of adsorption, adsorption isotherms, and solubility coefficients were largely dependent upon the structures and size of hydrocarbons and the choice of solid substrates. Measured molar enthalpies of adsorption became more exothermic with increasing size of hydrocarbons, ranging from −23.4 to −40.9 kJ/mol for carpet fibers, −36.2 to −48.2 kJ/mol for cotton fabric, and −30.1 to −52.5 kJ/mol for cardboard. From the adsorption isotherms and the measured retention times as a function of the injection amount, the adsorption affinity of hydrocarbons to the carpet fibers was found to be weaker than the affinity between hydrocarbon molecules, producing relatively lower solubility coefficients for all hydrocarbons than those measured on cotton fabric and cardboard. However, the adsorption affinities of hydrocarbons to both cotton fabric and cardboard were much stronger with increased solubility coefficients presumably due to the diffusion and dispersion of hydrocarbons through solid substrates. In particular, solubility coefficients of three aromatics on cardboard were significantly larger than those measured on carpet fibers and cotton fabric. This might be responsible for previously reported enhanced persistence of gasoline residues spiked on cardboard.
- Subjects :
- Paper
Chromatography, Gas
Inorganic chemistry
010402 general chemistry
01 natural sciences
Biochemistry
Chemistry Techniques, Analytical
Analytical Chemistry
chemistry.chemical_compound
Adsorption
Inverse gas chromatography
Solubility
Gasoline
Household Articles
chemistry.chemical_classification
Chromatography
Chemistry
Textiles
010401 analytical chemistry
Organic Chemistry
technology, industry, and agriculture
cardboard
General Medicine
Toluene
Hydrocarbons
0104 chemical sciences
Hydrocarbon
visual_art
visual_art.visual_art_medium
Dispersion (chemistry)
Subjects
Details
- ISSN :
- 00219673
- Volume :
- 1594
- Database :
- OpenAIRE
- Journal :
- Journal of Chromatography A
- Accession number :
- edsair.doi.dedup.....3e10bbcb7df5e4a5de9f2bd0980537e5