Cation Binding by Humic Substances (Cambridge Environmental by Edward Tipping

By Edward Tipping

Humic elements are highly-abundant natural compounds shaped in soils and sediments via the decay of lifeless vegetation, microbes and animals. This e-book makes a speciality of the real binding houses of those compounds which control the chemical reactivity and bioavailability of hydrogen and steel ions within the traditional atmosphere. subject matters coated comprise the physico-chemical homes of humic subject and interactions of protons and steel cations with vulnerable acids and macromolecules. Experimental laboratory equipment also are mentioned, including mathematical modelling. eventually the writer appears at how the result of this study can be utilized to interpret environmental phenomena in soils, waters and sediments. This accomplished account of cation binding by way of humic topic is a beneficial source for complicated undergraduate and graduate scholars, environmental scientists, ecologists and geochemists.

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Extra info for Cation Binding by Humic Substances (Cambridge Environmental Chemistry Series)

Example text

According to Vandenbroucke et al. (1985), the organic content of marine sediments is typically 100 mg g\, of which 90% is kerogen, consisting of humin (60%), humic acid (25%) and fulvic acid (15%). 1), the effective concentrations of sedimentary humic substances can be expressed in terms of mass per unit volume of porewater. The contents quoted for surface Japanese lake sediments in the previous paragraph correspond to a concentration of humic substances (including humin) of c. 2 g dm\, on the assumption that the water content of the sediments is 95%.

Algebraic manipulation of the relations allows us to calculate the concentrations of individual species, and will be used frequently in the following chapters. Here the basic principles of such manipulations are presented. We shall mainly be concerned with two types of reaction, proton dissociation and metal binding. 12) as a dissociation reaction, to achieve consistency between protons and metals. In this book however, the more traditional system is followed. 3. Possible chemical forms of Mn in natural waters and soils.

In soils, absorption of light influences warming properties (Stevenson, 1994). In waters, the presence of humic matter affects the penetration of light, thus influencing primary productivity (Schindler & Curtis, 1997). 8). 5 Environmental concentrations of humic substances Knowledge of humic concentrations in soils, waters and sediments is needed to appreciate the environmental effects of cation binding by humic matter. e. organic matter dynamics — is beyond the scope of the present text. An introduction is given by Stevenson (1994).

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