title: Input materials and processing conditions control compost dissolved organic carbon quality.
abstract: Dissolved organic carbon (DOC) has been proposed as an indicator of compost maturity and stability. Further fractionation of compost DOC may be useful for determining how particular composting conditions will influence DOC quality. Eleven composts ranging in input materials and processing techniques were analyzed; concentrations of DOC ranged from 428 mg kg(-1) to 7300 mg kg(-1). Compost DOC was qualified by fractionation into pools of humic acids (HA), fulvic acids (FA), hydrophobic neutrals (HoN), and hydrophilic (Hi) compounds. The range in proportion of DOC pools was highly variable, even for composts with similar total DOC concentrations. Longer composting time and higher temperatures consistently corresponded with a depletion of hydrophilics, suggesting a preferential turnover of these compounds during the thermophilic composting phase. Qualification of DOC pools through fractionation may be an informative tool in predicting the effects of a processing technique on compost quality and, ultimately, soil functional processes.
authors.affiliation: Wageningen University and Research Centre, Department of Soil Quality, P.O. Box 47, 6700 AA Wageningen, The Netherlands. Electronic address: angela.straathof@wur.nl.
authors.forename: Angela L
authors.initials: AL
authors.lastname: Straathof
authors.affiliation: Wageningen University and Research Centre, Department of Soil Quality, P.O. Box 47, 6700 AA Wageningen, The Netherlands. Electronic address: rob.comans@wur.nl.
authors.forename: Rob N J
authors.initials: RNJ
authors.lastname: Comans
mesh_terms: D002244:Carbon / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012995:Solubility
chemical_list: D009930:Organic Chemicals; D012987:Soil; D002244:Carbon
keywords: Composting; Dissolved organic carbon; Fractionation; Municipal solid waste; Organic matter