Modeling pH and ionic strength effects on proton and calcium complexation of fulvic acid: a tool for drinking water-NOM studies

Article Abstract:

A three-site electrostatic model for proton and calcium binding by aquatic humic substances is developed. It is used to describe the effect of ionic strength on proton complexation of fulvic acid and the impact of pH and ionic strength on the acid's calcium complexation. It can be used with data from conventional methods utilized to characterize natural organic matter and then used to determine behavior regarding charge, proton and calcium complexation to typical water treatment systems.

Models, Analysis, Organic compounds, Fulvic acids, Ionization, Hydrogen-ion concentration

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Comment on "Identification of halogenated compounds in chlorinated seawater and drinking water produced offshore using n-pentane extraction and open-loop stripping technique." (response to N.K. Kristiansen, et al., Environmental Science Technology, vol. 28, p.1669, 1994)

Article Abstract:

Kristiansen and his colleagues have neglected to mention that the use of sodium chloride as an extraction salt can result in the formation of new artifacts in unquenched extracts. In their experiments, a significant amount of bromide may have been inadvertently added to their samples. It is also possible that hypobromous acid was formed since most water samples were not quenched.

Halogens, Halogen elements

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A kinetic study of the oxidation of S(IV) in seawater

Article Abstract:

Seawater taken from Algeciras Bay near Cadiz, Spain is set at a certain temperature and pH level, and used to absorb sulfur, in order to determine the oxidation kinetics of the desulfurization process. Temperature and pH dependence of the desulfurization process in seawater is graphed.

Science & research, Spain, Chemical and fertilizer mining, not elsewhere classified, Sulfur, Other Chemical and Fertilizer Mineral Mining, Statistical Data Included, Environmental aspects, Chemical industry, Cadiz, Spain

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