Determination and theoretical aspects of the equilibrium between dissolved organic matter and hydrophobic organic micropollutants in water (Kdoc)

Reviews of Environmental Contamination and Toxicology
H B KropH A Govers

Abstract

Literature on the equilibrium constant for distribution between dissolved organic carbon (DOC) (Kdoc) data of strongly hydrophobic organic contaminants were collected and critically analyzed. About 900 Kdoc entries for experimental values were retrieved and tabulated, including those factors that can influence them. In addition, quantitative structure-activity relationship (QSAR) prediction equations were retrieved and tabulated. Whether a partition or association process between the contaminant and DOC takes place could not be fully established, but indications toward an association process are strong in several cases. Equilibrium between a contaminant and DOC in solution was shown to be achieved within a minute. When the equilibrium shifts in time, this was caused by either a physical or chemical change of the DOC, affecting the lighter fractions most. Adsorption isotherms turned out to be linear in the contaminant concentration for the relevant DOC concentration up to 100 mg of C/L. Eighteen experimental methods have been developed for the determination of the pertinent distribution constant. Experimental Kdoc values revealed the expected high correlation with partition coefficients over n-octanol and water (Kow) for all exp...Continue Reading

Citations

Dec 18, 2018·Frontiers in Microbiology·Juanjo RodríguezOwen Rowe
Jan 27, 2019·The Science of the Total Environment·Chiara Maria Vitale, Antonio Di Guardo
Jul 23, 2018·The Science of the Total Environment·Chiara Maria VitaleAntonio Di Guardo
Jul 1, 2016·Environmental Science & Technology·Leonard BöhmRolf-Alexander Düring

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