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Laor, Y., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel, Institute of Soils, Water, and Environmental Sciences, The Volcani Center, A.R.O., P.O.B. 6, Bet Dagan 50250, Israel
Zolkov, Ch., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel
Armon, R., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel
Humic substances originated from aquatic, soil, or sediment environments are mixtures of humic compounds with various characteristics. Sorption interactions with isolated, well defined humic fractions can be studied either in an aqueous phase ("dissolved humic substances"), or in a solid-phase, by coating mineral particles with the humic materials, or simply by working with humic acid particles (powder) at low pH to minimize dissolution. Each attitude, by definition, can be studied by different experimental techniques and has a different meaning for understanding natural environmental processes. In this study, a new tool for studying sorption interactions is presented. Solgel was used as an inert matrix to immobilize (entrap) various humic acids (HAs), and then used to study the interactions of several polycyclic aromatic hydrocarbons (PAHs) with the entrapped HA. Linear and nonlinear sorption coefficients were highly correlated with contaminant hydrophobicity. Sorption of pyrene to immobilized HA was in the order of soil HA > Aldrich HA ≈ peat HA. It was concluded that the entrapped HAs retained their original properties in the gel matrix and were accessible to the external contaminant through the pore network. Additionally, binding coefficients of pyrene to dissolved humic substances and to dissolved organic matter (DOM) were determined from the reduction in pyrene sorption to immobilized HA in the presence of dissolved humic material or DOM in solution. Binding coefficients of pyrene were in the order of the following: dissolved Aldrich HA > dissolved peat fulvic acid (FA) > DOM derived from mature compost > DOM derived from fresh compost.
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הספר "אוצר וולקני"
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תנאי שימוש
Immobilizing humic acid in a sol-gel matrix: A new tool to study humic-contaminants sorption interactions
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Laor, Y., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel, Institute of Soils, Water, and Environmental Sciences, The Volcani Center, A.R.O., P.O.B. 6, Bet Dagan 50250, Israel
Zolkov, Ch., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel
Armon, R., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel
Immobilizing humic acid in a sol-gel matrix: A new tool to study humic-contaminants sorption interactions
Humic substances originated from aquatic, soil, or sediment environments are mixtures of humic compounds with various characteristics. Sorption interactions with isolated, well defined humic fractions can be studied either in an aqueous phase ("dissolved humic substances"), or in a solid-phase, by coating mineral particles with the humic materials, or simply by working with humic acid particles (powder) at low pH to minimize dissolution. Each attitude, by definition, can be studied by different experimental techniques and has a different meaning for understanding natural environmental processes. In this study, a new tool for studying sorption interactions is presented. Solgel was used as an inert matrix to immobilize (entrap) various humic acids (HAs), and then used to study the interactions of several polycyclic aromatic hydrocarbons (PAHs) with the entrapped HA. Linear and nonlinear sorption coefficients were highly correlated with contaminant hydrophobicity. Sorption of pyrene to immobilized HA was in the order of soil HA > Aldrich HA ≈ peat HA. It was concluded that the entrapped HAs retained their original properties in the gel matrix and were accessible to the external contaminant through the pore network. Additionally, binding coefficients of pyrene to dissolved humic substances and to dissolved organic matter (DOM) were determined from the reduction in pyrene sorption to immobilized HA in the presence of dissolved humic material or DOM in solution. Binding coefficients of pyrene were in the order of the following: dissolved Aldrich HA > dissolved peat fulvic acid (FA) > DOM derived from mature compost > DOM derived from fresh compost.
Scientific Publication
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