Sorption of dissolved organic carbon in soils: effects of soil sample storage,soil-to-solution ratio,and temperature |
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| Institution: | 1. Institute of Soil Science and Soil Geography, University of Bayreuth, 95440 Bayreuth, Germany;2. Department of Soil Chemistry, University of Hohenheim, 70593 Stuttgart, Germany;1. Programa de Geoquímica, Universidade Federal Fluminense, Niterói, RJ, Brazil;2. Laboratoire, Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) UMR 5805, CNRS – Université de Bordeaux, Pessac, France;3. Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), UMR 7208, Muséum National d''Histoire Naturelle, CNRS, SU, UCN, UA, IRD, 61 rue Buffon, 75231, Paris cedex 05, France;1. Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, United States;2. School of Civil Engineering, The University of Sydney, Sydney, 2006, NSW, Australia;1. Nanjing Institute of Environmental Science, Ministry of Ecology and Environment of the People''s Republic of China, Nanjing 210042, China;2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;3. College of Agricultural Science and Engineering, Hohai University, Nanjing 211100, China;4. Key Laboratory of Soil Environmental Management and Pollution Control, Ministry of Ecology and Environment, Nanjing 210042, China;1. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, East Beijing Road 71, Nanjing 210008, PR China;2. College of Resources and Environmental Sciences, Key Laboratory of Plant–Soil Interactions of the Ministry of Education, China Agricultural University, Beijing 100193, PR China |
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| Abstract: | Experiments on the sorption of dissolved organic carbon (DOC) in soils were mainly conducted in batch approaches. Because varying setups were used in these studies, comparison of the results requires knowledge on the effects that different experimental conditions may have on the sorption of DOC. This investigation evaluated the DOC sorption of soils using differently pretreated soil samples (field-fresh (two sampling dates), air-dried, stored at 3°C and −18°C), at different soil-to-solution ratios (1:40, 1:20, 1:10 and 1:5 w/v) and different temperatures (5°C, 15°C, 25°C and 35°C). The sorption of DOC was analyzed using the initial mass (IM) approach, which regressed the initial amount of sorbate (normalized to soil mass) against the sorbed amount (normalized to soil mass). The DOC release — when a solution without DOC was added — strongly increased with temperature and soil-to-solution ratio. Among the different types of sample storage and preparation, air-drying resulted in the largest DOC release. The smallest release was from the field-fresh samples. Freezing and storage at 3°C resulted in intermediate DOC release with freezing having the greater effect. The release from air-dried samples exceeded that of field-fresh samples by a factor of four at maximum. In contrast, none of the experimental setups influenced the slope of the IM isotherms. Thus, it seems possible to compare directly the binding affinity of DOC to different soils as determined at varying experimental conditions. |
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