Characterization of humic substances from the Oneida Lake watershed

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Abstract
Humic substances from the watershed of Oneida Lake, an eutrophic lake, near Syracuse, N.Y., were isolated in order to determine if humic substances from different sources have different characteristics. Samples studied include dissolved organic matter extracted from water and alkali soluble substituents from soils and sediments. Dissolved organic matter was concentrated using XAD‐8 resin. Alkali extractable materials from soils and sediment were divided into fulvic and humic acids. Samples were analyzed using 13C and 1 H NMR spectroscopy, infrared and UV‐visible spectrometry, gel permeation chromatography, ash content, total organic carbon (TOC) and chemical oxygen demand (COD). Results obtained from statistical analysis and comparison of data indicated that the humic substances of different origins could be classified into four categories; soil fulvic acids, soil humic acids, dissolved organic matter, and sedimentary organic matter.