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, add nutrients to a poor Organic Matter (OM) soil, since their Total Organic Carbon (TOC) content is generally high. TOC and TOC to Nitrogen ratio (TOC/N) and other chemical elements (P, Ca, Mg, Na and K) are generally used to characterize amended soils. It has been recently observed that the quantity of OM can influence soil texture and consequently the pores size distribution. Therefore, techniques such as the non-invasive and non-destructive Time-Domain Nuclear Magnetic Resonance of nuclei 1H in (1H TD-NMR) and N2 adsorption/desorption can be profitably employed to investigate the textural properties of these amended environments. The 1H TD-NMR signal is proportional to the total amount of water inside the pores and gives information on the pore arrangement, by means the relaxation times (longitudinal T1 and transversal T2) distributions. In this study contaminated soils have been characterized by T1 distributions analysis, using a specifically developed NMR sequence that overcomes many measurement difficulties due to the complex structure of OM and the presence of paramagnetic elements. N2 sorption at soils surfaces allows the determination of the specific surface area (SSA), which consents the characterization of much larger volume or mass samples than microscopic techniques. The SSA depends on the structure of soils aggregates and permits to model OM-soil minerals aggregation. In this work we show how the increasing amount of TOC, which influences pores structure, can be investigated in a complementary way by both techniques.

Amended soils characterization by 1H Nuclear Magnetic Resonance and N2 adsorption-desorption

VANNINI, MARIANNA;BENITO MARTIN, PATRICIA;BONOLI, ALESSANDRA;BORTOLOTTI, VILLIAM;FORNASARI, GIUSEPPE;MACINI, PAOLO
2013

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, add nutrients to a poor Organic Matter (OM) soil, since their Total Organic Carbon (TOC) content is generally high. TOC and TOC to Nitrogen ratio (TOC/N) and other chemical elements (P, Ca, Mg, Na and K) are generally used to characterize amended soils. It has been recently observed that the quantity of OM can influence soil texture and consequently the pores size distribution. Therefore, techniques such as the non-invasive and non-destructive Time-Domain Nuclear Magnetic Resonance of nuclei 1H in (1H TD-NMR) and N2 adsorption/desorption can be profitably employed to investigate the textural properties of these amended environments. The 1H TD-NMR signal is proportional to the total amount of water inside the pores and gives information on the pore arrangement, by means the relaxation times (longitudinal T1 and transversal T2) distributions. In this study contaminated soils have been characterized by T1 distributions analysis, using a specifically developed NMR sequence that overcomes many measurement difficulties due to the complex structure of OM and the presence of paramagnetic elements. N2 sorption at soils surfaces allows the determination of the specific surface area (SSA), which consents the characterization of much larger volume or mass samples than microscopic techniques. The SSA depends on the structure of soils aggregates and permits to model OM-soil minerals aggregation. In this work we show how the increasing amount of TOC, which influences pores structure, can be investigated in a complementary way by both techniques.
2013
Proceedings "XIV Congresso Nazionale di Chimica delll’Ambiente e dei Beni Culturali, “La chimica nella società sostenibile”
101
102
VANNINI M.; BENITO MARTIN P.; BONOLI A.; BORTOLOTTI V.; FORNASARI G.; MACINI P.;
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/379447
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