Determination of leaching behaviour of polycyclic aromatic hydrocarbons from contaminated soil by column leaching test

Abstract

Column leaching tests become increasingly important for assessing the risk of release of pollutants from a wide variety of solid materials into water. In this study a column leaching test was designed to provide insight into the fate of selected polycyclic aromatic hydrocarbons (PAHs) in soils and their leaching behaviour. The results showed relatively high initial concentrations of naphthalene, anthracene, and pyrene for column B2. Two proportions of contaminated soil (5 and 20%) used in the columns yielded different leaching behaviour. Different contact time applied in columns B1 and B2 affected the initial amounts of leached PAHs. Results indicated that the distribution pattern of PAH compounds in solid phase considerably affected leached concentrations of PAHs. Released amounts of PAH compounds decreased with increasing molecular size, or rather the hydrophobicity of the compound. The effect of dissolved organic carbon on PAH leaching was also investigated in this study. The mobilization of colloids did not show any significant effect on leached concentrations of PAH compounds. Approximately 4.6 and 2.2% of the total initial amounts of studied PAHs in the soil were leached in columns B1 and B2, respectively. Therefore high PAH concentrations in the solid phase does not imply serious groundwater contamination risk during a leaching event (e.g. raining) and significant amount of contaminants may stay in the soil layer for a long time and do not leach down into groundwater.

Keywords

Column leaching test polycyclic aromatic hydrocarbons soil desorption dissolved organic carbon

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References

Celis, R. , Real, M. , Hermosin, M.C. & Cornejo, J. ( 2006) Desorption, persistence, and leaching of dibenzofuran in European soils. Soil Science Society of America Journal , 70, 1310-1317.

CEN. (2004) CEN/TS 14405. Characterization of Waste - Leaching Behaviour Tests - Up-flow Percolation Test (under specified conditions). European Committee for Standardisation, Brussels, Belgium.

Chiou, C.T. , McGroddy, S.E. & Kile, D.E. ( 1998) Partition characteristics of polycyclic aromatic hydrocarbons on soils on sediments. Environmental Science and Technology , 32, 264-269.

DIN (1998) DIN V 19736, Pre-standard: Soil quality: Derivation of Concentrations of Organic Pollutants in Soil Water. German Standard Methods, Germany.

Enell, A. , Reichenberg, F. , Warfvinge, P. & Ewald, G. ( 2004) A column method for determination of leaching of polycycling aromatic hydrocarbons from aged contaminated soil. Chemosphere , 54, 707-715.

Enell, A. , Fuhrman, F. , Lundin, L. , Warfvinge, P. & Thelin, G. ( 2008) Polycyclic aromatic hydrocarbons in ash: determination of total and leachable concentrations. Environmental Pollution , 152, 285-292.

Fetterolf, G.J. ( 1998) Characterization of a Creosote-Contaminated Tie Yard Site and the Effects of Phytoremediation. MSc Thesis, Virginia Tech University, USA.

Grathwohl, P. ( 1998) Diffusion in Natural Porous Media: Contaminant Transport, Sorption/Desorption and Dissolution Kinetics, pp. 11-84. Kluwer Academic Publishers, Boston/ Dordrecht/London.

Grathwohl, P. & Van der Sloot, H. ( 2007) Groundwater risk assessment at contaminated sites (GRACOS): test methods and modeling approaches. In Quevauviller, P. (ed.): Groundwater Science and Policy, pp. 291-315. RSC Publishing, Cambridge, UK.

10.

Grathwohl, P. & Susset, B. (2009) Comparison of percolation to batch and sequential leaching tests: Theory and data. Waste Management, 29, 2681-2688.

11.

Hatzinger, P. & Alexander, M. ( 1995) Effect of aging of chemicals in soil on their biodegradability and extractability. Environmental Science and Technology, 29, 537-545.

12.

Kalbe, U. , Berger, W. , Simon, F.G. , Eckardt, J. & Christoph, G. ( 2007) Results of interlaboratory comparisons of column percolation tests. Journal of Hazardous Materials, 148, 714-720.

13.

Kalbe, U. , Berger, W. , Eckardt, J. & Simon, F. ( 2008) Evaluation of leaching and extraction procedures for soil and waste. Waste Management, 28, 1027-1038.

14.

Kan, A. , Hunter, G. , Chen, W. , Ward, C. & Tomson, M. ( 1998) Irreversible sorption of neutral hydrocarbons to sediments: experimental observations and model predictions. Environmental Science and Technology, 32, 892-902.

15.

Kim, Y.J. , Lee, D.H. & Osako, M. ( 2002) Effect of dissolved humic matters on the leachability of PCDD/Fs from fly ash - laboratory experiment using Aldrich humic acid. Chemosphere, 47, 599-605.

16.

Persson, Y. , Hemstrom, K. , Oberg. L. , Tysklind, M. & Enell, A. ( 2008) Use of a column leaching test to study the mobility of chlorinated HOCs from a contaminated soil and the distribution of compounds between soluble and colloid phases. Chemosphere, 71, 1035-1042.

17.

Sabbah, I. , Rebhun, M. & Gerstl, Z. ( 2004) An independent prediction of the effect of dissolved organic matter on the transport of polycyclic aromatic hydrocarbons. Journal of Contaminant Hydrology, 75, 55-70.

18.

Susset, B. & Grathwohl, P. ( 2008) Column leaching test for groundwater risk assessment: concept, interpretation of results and reproducibility. From European lysimeter station, reports (2008): http://www.lysimeter.at/HP-EuLP/web/resreports/dumps.html (accessed 28 March 2009).

19.

Zanst, K. ( 2008) Comparison of Leaching Tests for PAHs Contaminated Soils . MSc Thesis, Center for Applied Geosciences, University of Tubingen, Germany.