Ecology of Humic Substances in Freshwaters: Determinants by Christian Steinberg PDF

By Christian Steinberg

There are already a few multi-author books inquisitive about humic elements out there which conceal the chemical and geochemical elements. Their major concentration is on soil technology, but additionally comprises freshwater ecology and chemistry. In exisiting guides the interplay of humic fabric with acquatic organisms isn't really handled intensive, being considered as an oblique impact. during this e-book, even though, the writer considers the geochemical in addition to the physiological and ecotoxicological results from a different perspective, hence warding off breaks among chapters that is often the case in multi-author books.

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HM . . _- _ .. . .. _- _.... . -_ .. ..... .... Isecondary I I I precursors (sPC) HAP ~ humic acid prectJrsor HA =humic acid HM;;; humin HS =humic substance Fig. 5. 4 Recent Findings about Production and Diagenesis HS are subject to many geochemical and biological diagenetic processes. For instance, Clair et al. (1989) show that microbial activity with 'fresh' HS is considerable, and decreases as the HS are increasingly altered. The changes in HS in nonsterile microcosms cause an increase in pH and a loss of strong organic acids, which only microbial activity can account for.

Simultaneously, the isotopic content of the anhydropyranose tends to increase with profile depth. It is almost certain that this compound is an anabolic product from microorganisms. Anhydropyranose, but not l-dodecene, increases simultaneously with the content of heavy stable C isotopes. The constancy of the 0 value indicates that l-dodecene, possibly a lipid pyrolysis product, is selectively conserved. 7%0 in the moss, to relatively constant values around -24%0 in the peat. This pyrolysis product is most probably derived from a pentose.

In contrast to aromatic building blocks, the long-chain fatty acids do not belong to the photostable compounds in HS (Schmitt-Kopplin et al. 1998). However, Jandl et al. do not find higher concentrations of fatty acids in soil organic matter than in surface water DOC - rather the contrast applies: the concentrations of long-chain fatty acids in aquatic DOC exceed those in soil dissolved organic matter by far. 1) and affect the environmental behavior of HS and their interactions with aquatic organisms (Chap.

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