Sorpčné správanie polycyklických aromatických uhľovodíkov (PAU) v pôdach

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Title:Sorpčné správanie polycyklických aromatických uhľovodíkov (PAU) v pôdach
Creators:
Hiller, Edgar; hiller at fns dot uniba dot sk; Prírodovedecká fakulta, katedra geochémie, Univerzita Komenského, Mlynská dolina, 842 15 Bratislava, Slovenská republika
Bartaľ, Mikuláš; Národné referenčné laboratórium, Výskumný ústav vodného hospodárstva, Nábr. arm. gen. L. Svobodu 5, 812 49 Bratislava 1, Slovenská republika
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 53, 2, pp. 113-127
Uncontrolled Keywords:Polycyclic Aromatic Hydrocarbons (PAHs), Nonlinear and Non-Equilibrium Sorption, Freundlich Isotherm, Sorption Contact Time, Organic Carbon, Smectites

Abstract

This study is dedicated to laboratory investigation of sorption behavior of polycyclic aromatic hydrocarbons in soils under equilibrium and non-equilibrium conditions. Six soils from Slovakia with different organic carbon fraction (fOC = 0.0048–0.0241), clay fraction (fCM = 0.006–0.372) and mineralogical composition of clays were used for determination of naphthalene, acenaphthene, fluorene, phenanthrene and pyrene sorption isotherms. Impact of sorption contact time on sorption behavior of studied PAHs was evaluated by measured distribution relationships S(t) vs. C(t) for naphthalene, phenanthrene and pyrene in one soil sample at contact time of 2 hours, 1 day, 2 days (3 for pyrene) and 21 days. The experimental sorption isotherms were nonlinear and fitted very well with the Freundlich adsorption isotherm: S = KFCeN over a range of used aqueous phase PAH concentrations. The more detailed analysis of results showed that soil organic carbon was predominant sorbent in the sorption of investigated polycyclic aromatic hydrocarbons from aqueous solution by soils, although it was found that sorption behavior of PAH compounds in soils was significantly affected by smectites when organic carbon/smectite ratio was roughly below 0.1 (fOC/fsmectite ~0.1). The results also showed that average distribution coefficient KD values and the normalized to organic carbon content KOC of studied PAH compounds, despite observed nonlinear sorption, were comparable with their values earlier published in the literature and were dependent on their molecular properties: hydrophobicity expressed as KOW and water solubility SW. All observed distribution relationships for contact times used fitted to a power function reflecting non-equilibrium conditions: S(t) = kF(t)C(t)n(t). The data indicate significant increase in sorption of naphthalene between 2 h and 1 d, phenanthrene between 2 h and 2 d and pyrene at interval of 2 h to 21 d. This observation suggests that more hydrophobic PAH compounds exhibit slower sorption kinetics than less hydrophobic compounds like naphthalene. Observed changes in sorption of PAHs studied as contact time increased indicate that literature KD and KOC values for many organic compounds can be significantly underestimated as were measured over short periods (?1 d) because short periods not need always represent equilibrium conditions during realized batch experiments.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Sorpčné správanie polycyklických aromatických uhľovodíkov (PAU) v pôdach
Translated title:The sorption characteristics of polycyclic aromatic hydrocarbons (PAHs) in soils
Creators:
Hiller, Edgar; hiller at fns dot uniba dot sk; Prírodovedecká fakulta, katedra geochémie, Univerzita Komenského, Mlynská dolina, 842 15 Bratislava, Slovenská republika
Bartaľ, Mikuláš; Národné referenčné laboratórium, Výskumný ústav vodného hospodárstva, Nábr. arm. gen. L. Svobodu 5, 812 49 Bratislava 1, Slovenská republika
Uncontrolled Keywords:Polycyclic Aromatic Hydrocarbons (PAHs), Nonlinear and Non-Equilibrium Sorption, Freundlich Isotherm, Sorption Contact Time, Organic Carbon, Smectites
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:53
Number:2
Page Range:pp. 113-127
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:6016
Item Type:Article
Deposited On:15 Jun 2010 12:23
Last Modified:15 Jun 2010 10:23

Citation

Hiller, Edgar; Bartaľ, Mikuláš (2005) Sorpčné správanie polycyklických aromatických uhľovodíkov (PAU) v pôdach. Journal of Hydrology and Hydromechanics, 53 (2). pp. 113-127. ISSN 0042-790X

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