Impacts of Heterogeneous Organic Matter on Phenanthrene Sorption: Equilibrium and Kinetic Studies with Aquifer Material

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• 作者：Hrissi K. Karapanagioti ; Sybille Kleineidam ; David A. Sabatini ; Peter Grathwohl ; and Bertrand Ligouis
• 刊名：Environmental Science & Technology
• 出版年：2000
• 出版时间：February 1, 2000
• 年：2000
• 卷：34
• 期：3
• 页码：406 - 414
• 全文大小：955K
• 年卷期：v.34,no.3(February 1, 2000)
• ISSN：1520-5851

文摘

Sediment organic matter heterogeneity in sediments isshown to impact the sorption behavior of contaminants.We investigated the sorptive properties as well as thecomposition of organic matter in different subsamples (mainlygrain size fractions) of the Canadian River Alluvium(CRA). Organic petrography was used as a new tool todescribe and characterize the organic matter in thesubsamples. The samples studied contained many differenttypes of organic matter including bituminous coal particles.Differences in sorption behavior were explained basedon these various types of organic matter. Subsamplescontaining predominately coaly, particulate organic mattershowed the highest K_oc, the highest nonlinearity ofsorption isotherms and the slowest sorption kinetics. Soilsubsamples with organic matter present as organiccoatings around the quartz grains evidenced the lowestK_oc, the most linear sorption isotherms and the fastest sorptionkinetics, which was not limited by slow intraparticlediffusion. Due to the high sorption capacity of the coalyparticles even when it is present as only a small fractionof the composite organic content (<3%) causes K_ocvalues which are much higher than expected for soil organicmatter (e.g. K_oc - K_ow relationships). The results showthat the identification and quantification of the coaly particleswithin a sediment or soil sample is a prerequisite inorder to understand or predict sorption behavior of organicpollutants.