Soil remediation has recently included the use of organic recycled materials (e.g. sewage sludge or paper mill sludge) which, thanks to their stability in aerobic conditions, can improve soil properties. Paper sludge, for example, adds nutrients to a poor Organic Matter (OM) soil, since the Total Organic Carbon (TOC) content is generally high. TOC and TOCto-Nitrogen ratio (TOC/N) and other chemical elements (P, Ca,Mg, Na and K) are generally used to characterize amended soils [1]. It has been recently observed that the quantity of OM can influence soil texture and consequently the pore size distribution. New efforts are arising towards the use of non-invasive and non-destructive techniques to characterize this kind of sample, to gain more reliable information on interactions between OM and soil mineral phases. Proton Time-Domain Nuclear Magnetic Resonance (1H TD-NMR) can be profitably employed to investigate the textural properties of these amended environmental substances. Applications of the TD-NMR technique are not so much used in soil science, although it shows great potential, probably due to the huge heterogeneity of these materials and to the presence of high paramagnetic ion concentrations found both in natural soils and in the contaminants. In particular, in this study contaminated soils have been characterized by T1 distribution analysis, using a specifically developed NMR sequence to overcome experimental difficulties, to obtain information on the porosity related to the irreducible water [1]. On the other side, N2 sorption at soils surfaces has been usually used for the determination of the Specific Surface Area (SSA). SSA depends on the structure of soil aggregates and permits one to investigate OM-soil minerals aggregation [2]. In this work we investigate how the amount of TOC in soil sample can be investigated by TD-NMR and SSA techniques. [1] M. Vannini, A. Bonoli, V. Bortolotti, P. Macini, E. Mesini. Proceedings of the 3rd International Conference on industrial and hazardous waste management, Chania (Crete), September 2012. [2] R. Wagai, L. Mayer, K. Kitayama, Geoderma, 149 (1-2), 152-160, (2009).
1H Time Domain Nuclear Magnetic Resonance Microporosity and Specific Surface Area of Soils from Remediation Sites
BENITO MARTIN, PATRICIA;BORTOLOTTI, VILLIAM;BRIZI, LEONARDO;FANTAZZINI, PAOLA;FORNASARI, GIUSEPPE;MARIANI, MANUEL;VANNINI, MARIANNA
2014
Abstract
Soil remediation has recently included the use of organic recycled materials (e.g. sewage sludge or paper mill sludge) which, thanks to their stability in aerobic conditions, can improve soil properties. Paper sludge, for example, adds nutrients to a poor Organic Matter (OM) soil, since the Total Organic Carbon (TOC) content is generally high. TOC and TOCto-Nitrogen ratio (TOC/N) and other chemical elements (P, Ca,Mg, Na and K) are generally used to characterize amended soils [1]. It has been recently observed that the quantity of OM can influence soil texture and consequently the pore size distribution. New efforts are arising towards the use of non-invasive and non-destructive techniques to characterize this kind of sample, to gain more reliable information on interactions between OM and soil mineral phases. Proton Time-Domain Nuclear Magnetic Resonance (1H TD-NMR) can be profitably employed to investigate the textural properties of these amended environmental substances. Applications of the TD-NMR technique are not so much used in soil science, although it shows great potential, probably due to the huge heterogeneity of these materials and to the presence of high paramagnetic ion concentrations found both in natural soils and in the contaminants. In particular, in this study contaminated soils have been characterized by T1 distribution analysis, using a specifically developed NMR sequence to overcome experimental difficulties, to obtain information on the porosity related to the irreducible water [1]. On the other side, N2 sorption at soils surfaces has been usually used for the determination of the Specific Surface Area (SSA). SSA depends on the structure of soil aggregates and permits one to investigate OM-soil minerals aggregation [2]. In this work we investigate how the amount of TOC in soil sample can be investigated by TD-NMR and SSA techniques. [1] M. Vannini, A. Bonoli, V. Bortolotti, P. Macini, E. Mesini. Proceedings of the 3rd International Conference on industrial and hazardous waste management, Chania (Crete), September 2012. [2] R. Wagai, L. Mayer, K. Kitayama, Geoderma, 149 (1-2), 152-160, (2009).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
