SEARCH Articles Figures Tables Fractionation dissolved organic matter isolation Fractionation marine organic matter Fractionation soil organic matter, carbon dynamics Fractionation soluble organic matter Humic matter fraction Humic matter fraction ultrafiltration Organic matter carbon isotope fractionation Organic matter high-molecular-weight fraction Organic matter operationally defined fractions Particulate-matter extracts, fractionating Respirable particulate matter fraction Source, Production, and Fractions of Dissolved Organic Matter