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Environmental Engineering Research 2000;5(2): 107-117.
BIPHASIC SORPTION OF CHLOROBENZENE AND PHENANTHRENE IN HIGHLY ORGANIC WETLAND SOILS
Won Sik Shin
Department of Environmental Engineering, Kyungpook National University, Taegu 702-701, Korea
Corresponding Author: Won Sik Shin ,
Received: June 15, 2000;  Accepted: August 11, 2000.
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ABSTRACT
Sorption'desorption stud) was conducted to determine desorption-resistance of hydrophobic organic compounds in recently deposited wetland peat soils explicitly. Sorption/desorption characteristics of organic compounds (chlorobenzene and phenanthrene) for both surface marsh soil (top 0-2 cm, <5 years old) and deeper marsh soil (below 10-cm, > 20 years old) were investigated to see if soil age can cause differences in sorption/desorption in wetlands. Measurements of organic matter age were conducted using several techniques including the ratio of elemental hydrogen to carbon in the organic matter. The biphasic sorption model indicated the presence of appreciable desorption-resistant phase in wetland soils. A finite maximum capacity of desorption-resistant fraction (#!,','„ I was observed after several desorption steps. The apparent organic carbon based partition coefficient (K','„') was increasing with soil age indicating an increase in the size of the desorption-resistance in 'older" organic matter. The results suggest that increased desorption-resistance with soil age should be considered in remediation and risk assessments.
Keywords: biphasic sorption | desorption-resistance | wetland | aging | sequestration | risk assessment
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