Humic Substances in the Aquatic and Terrestrial Environment

The different roles of humic substances in the environment.- Factors to be considered in the isolation and characterization of aquatic humic substances.- Comparison of aquatic humic substances of different origin.- Structural features of aquatic fulvic acids by analytical and preparative HPLC followed by spectroscopic characterization.- Fluorescence spectroscopy as a means of distinguishing fulvic and humic acids from dissolved and sedimentary aquatic sources and terrestrial sources.- Dielectric spectroscopy of aqueous solutions of fulvic acids.- Cobaltihexamine as an index cation for measuring the cation exchange capacity of humic acids.- Investigation of humic acid samples from different sources by photon correlation spectroscopy.- The behaviour of diborane-reduced fulvic acids in flash pyrolysis.- Some aspects of the characterization of humic substances in lake waters.- Isolation and fractionation of humic substances in lake waters.- Dating of groundwaters by 14C-analysis of dissolved humic substances.- Characterization of organic materials by means of electrofocusing.- Nature of humic substances of Mollisol and Luvisol in the Canadian Prairies.- Influence of vegetation changes on soil organic matter.- Humification parameters of organic materials applied to soil.- Solid state 13C CP MAS NMR characterization of the chemical structure of terrestrial organic matter from areas with differing vegetational backgrounds.- Carbon-13 nuclear magnetic resonance analysis, lignin content and carbohydrate composition of humic substances from salt marsh estuaries.- The effect of composting on the organic colloidal fraction from domestic sewage sludge.- Some effects of ozonation of humic substances in drinking water.- Upgrading the removal of humic substances and mutagen precursors in water treatment.- Effects of gamma irradiation on an aquatic fulvic acid.- Coloured substances in Swedish lakes and rivers — temporal variation and regulating factors.- Large-scale pattern of mor layer degradability in Sweden measured as standardized respiration.- Ion binding by humic substances: Considerations based on the solution chemistry and heterogeneity of humic substances.- The incorporation of natural organic matter — cation interaction into the speciation code PHREEQE.- Calcium binding to an aquatic fulvic acid.- Interaction of strontium and europium with an aquatic fulvic acid studied by ultrafiltration and ion exchange techniques.- Complexation behaviour of humic substances from granitic groundwater towards Am(III).- Natural organic acids in acidic surface water. acid-base properties, complex formation with aluminum, and their contribution to acidification.- Investigations of the interaction of transranic radionuclides with humic and fulvic acids chemically immobilized on silica gel.- Complexing properties of humic substances isolated from sea water; the contribution of these substances to complexing capacities of water from the Baltic Sea and geochemical implications of this phenomenon.- An evaluation of chemically immobilized humic acid: A new stationary phase for RP-HPLC prediction of uptake of organic pollutants by soils and sediments.- The influence of aquatic humic substances on the octanol/water partition coefficient (Kow) of pesticides and trace elements at different pH values.- The contradictory biological behavior of humic substances in the aquatic environment.- Effects of humic substances from different sources on growth and nutrient content of cucumber plants.- Phytotoxic substances in runoff from forested catchment areas.- Interaction of humic acids and humic-acid-like polymers with herpes simplex virus type 1.- Effects of pH and natural humic substances on the accumulation of organic pollutants in two freshwater invertebrates.- Influence of natural humic acids and synthetic phenolic polymers on fibrinolysis.- Differential inhibitory effects of humic acids on coagulation systems of human blood.- Mutagenic compounds from chlorination of humic substances.- Mutagenic activity in disinfected waters and recovery of the potent bacterial mutagen "MX" from water by XAD resin adsorption.- Formation of 3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone (MX) and mutagenic activity by chlorination of phenolic compounds.- Iodinated humic acids.- Soil peroxidase-mediated chlorination of fulvic acid.- Natural organochlorine in humic soils. GC and GC/MS studies of soil pyrolysates.- Organic halogens in Danish groundwaters.