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A study of interactions between soil fractions and PAH compounds in thermal desorption of contaminated soils
Author(s) -
Maguire Vineeta,
Svrcek William Y.,
Mehrotra Anil K.,
Razzaghi Minoo
Publication year - 1995
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450730608
Subject(s) - chemistry , naphthalene , humin , differential scanning calorimetry , desorption , soil water , vaporization , fraction (chemistry) , anthracene , thermal desorption , environmental chemistry , volatilisation , endothermic process , phenanthrene , analytical chemistry (journal) , humic acid , adsorption , chromatography , organic chemistry , thermodynamics , physics , fertilizer , environmental science , soil science
The interactions between three polynuclear aromatic hydrocarbons (PAHs), namely fluorene, naphthalene and anthracene, and three fractions of a soil, namely fulvic acid (FA), humic acid (HA) and humin/inorganic fractions, were studied experimentally. Prepared PAH + soil fraction binary mixtures, with PAH concentrations ranging over 0.8–7 mass%, were tested using a differential scanning calorimeter (DSC) over a temperature range of 20−390°C. The DSC thermograms for the PAH + HA mixtures showed distinctly different characteristics compared to mixtures with the other two soil fractions, where the endothermic peak for the vaporization of the PAH was absent. With the aid of vapour‐liquid flash calculations, the lack of the boiling point peak is interpreted to be due to the liquid‐phase miscibility of the PAHs and the HA fraction. Implications of the DSC results on the design and performance of the thermal desorption process are discussed.