Molecular weight, polydispersity, and spectroscopic properties of aquatic humic substances.

摘要: The number- and weight-averaged molecular weights of a number aquatic fulvic acids, commercial humic acid, unfractionated organic matter from four natural water samples were measured by high-pressure size exclusion chromatography (HPSEC). Molecular determined in this manner compared favorably with those values reported the literature. Both recent literature our data indicate that these substances are smaller less polydisperse than previously believed. Moreover, three to acid extracted similar environments