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Effects of Long‐Term Sewage Sludge Amendment on the Composition, Structure and Proton Binding Activity of Soil Fulvic Acids
The objective of this research was the evaluation of long‐term effects of amendment with sewage sludge (SL) on the compositional, structural, and functional characteristics of soil fulvic acids (FAs) with special emphasis on their acid‐base properties. For this purpose, FAs were isolated from SL, soils amended with SL after 9 and 36 months from amendment, and the corresponding unamended soil. With respect to unamended soil FA, SL‐FA was characterized by a prevalent aliphatic character, larger contents of C, H, N, and S, smaller contents of O, carboxyl and phenolic OH, total acidity, and C/N and C/H ratios. The SL‐amendment determined a number of modifications in soil FA, including an increase of aliphaticity and N, H and S contents, a decrease of O and acidic functional group contents and C/N ratios, and a slightly increase of proton affinity of the carboxylic‐type and phenolic‐type groups. Further, SL‐application induced a decrease of heterogeneity of carboxylic‐type groups, whereas the heterogeneity of phenolic‐type groups increased substantially. These changes, in turn, influenced the acid‐base buffering capacity of SL‐amended soils, which is expected to have an important impact on the biological availability, mobilization, and transport of nutrients and heavy metal ions in SL‐amended soils. However, these effects on SL‐amended soil FAs become less and less apparent with a clear trend to approach the molecular properties of native soil FA.
Effects of Long‐Term Sewage Sludge Amendment on the Composition, Structure and Proton Binding Activity of Soil Fulvic Acids
The objective of this research was the evaluation of long‐term effects of amendment with sewage sludge (SL) on the compositional, structural, and functional characteristics of soil fulvic acids (FAs) with special emphasis on their acid‐base properties. For this purpose, FAs were isolated from SL, soils amended with SL after 9 and 36 months from amendment, and the corresponding unamended soil. With respect to unamended soil FA, SL‐FA was characterized by a prevalent aliphatic character, larger contents of C, H, N, and S, smaller contents of O, carboxyl and phenolic OH, total acidity, and C/N and C/H ratios. The SL‐amendment determined a number of modifications in soil FA, including an increase of aliphaticity and N, H and S contents, a decrease of O and acidic functional group contents and C/N ratios, and a slightly increase of proton affinity of the carboxylic‐type and phenolic‐type groups. Further, SL‐application induced a decrease of heterogeneity of carboxylic‐type groups, whereas the heterogeneity of phenolic‐type groups increased substantially. These changes, in turn, influenced the acid‐base buffering capacity of SL‐amended soils, which is expected to have an important impact on the biological availability, mobilization, and transport of nutrients and heavy metal ions in SL‐amended soils. However, these effects on SL‐amended soil FAs become less and less apparent with a clear trend to approach the molecular properties of native soil FA.
Effects of Long‐Term Sewage Sludge Amendment on the Composition, Structure and Proton Binding Activity of Soil Fulvic Acids
García‐Gil, Juan Carlos (author) / Plaza, César (author) / Senesi, Nicola (author) / Brunetti, Gennaro (author) / Polo, Alfredo (author)
CLEAN – Soil, Air, Water ; 35 ; 480-487
2007-11-01
8 pages
Article (Journal)
Electronic Resource
English
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