Molecular composition of recycled organic wastes,as determined by solid-state 13C NMR and elemental analyses |
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| Authors: | S.M. Eldridge C.R. Chen Z.H. Xu P.N. Nelson S.E. Boyd I. Meszaros K.Y. Chan |
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| Affiliation: | 1. Environmental Futures Centre, School of Environment, Griffith University, Nathan, QLD 4111, Australia;2. NSW Department of Primary Industries, Bruxner Highway, Wollongbar, NSW 2477, Australia;3. Environmental Futures Centre, School of Biomolecular and Physical Sciences, Griffith University, Nathan, QLD 4111, Australia;4. School of Earth and Environmental Sciences, James Cook University, Cairns, QLD 4870, Australia;5. Graduate School of Environment, Macquarie University, North Ryde, NSW 2109, Australia;6. Formerly NSW Department of Primary Industries, Richmond, NSW 2753, Australia |
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| Abstract: | Using solid state 13C NMR data and elemental composition in a molecular mixing model, we estimated the molecular components of the organic matter in 16 recycled organic (RO) wastes representative of the major materials generated in the Sydney basin area. Close correspondence was found between the measured NMR signal intensities and those predicted by the model for all RO wastes except for poultry manure char. Molecular nature of the organic matter differed widely between the RO wastes. As a proportion of organic C, carbohydrate C ranged from 0.07 to 0.63, protein C from <0.01 to 0.66, lignin C from <0.01 to 0.31, aliphatic C from 0.09 to 0.73, carbonyl C from 0.02 to 0.23, and char C from 0 to 0.45. This method is considered preferable to techniques involving imprecise extraction methods for RO wastes. Molecular composition data has great potential as a predictor of RO waste soil carbon and nutrient outcomes. |
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| Keywords: | Carbon sequestration Nitrogen mineralisation Molecular mixing model Detergent fibre analysis Lignin NMR |
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